CN107422005B - A kind of nondestructive detection system of petroleum tank bottom plate corrosion product state - Google Patents
A kind of nondestructive detection system of petroleum tank bottom plate corrosion product state Download PDFInfo
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- CN107422005B CN107422005B CN201710635485.5A CN201710635485A CN107422005B CN 107422005 B CN107422005 B CN 107422005B CN 201710635485 A CN201710635485 A CN 201710635485A CN 107422005 B CN107422005 B CN 107422005B
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Abstract
The invention discloses a kind of nondestructive detection systems suitable for petroleum tank bottom plate corrosion product state comprising has electrochemical impedance spectroscopy acquisition subsystem (1), sound emission burst information acquisition subsystem (2) and petroleum tank connate water insole board corrosion product state to judge subsystem (3).The present invention is analyzed by the electrochemical impedance spectroscopy under acquisition time, acoustic emission energy spectrum, obtain the generation, dissolution and rupture event of corrosion products film of the petroleum tank insole board under the corrosive environment of connate water, so as to judge the stress corrosion situation of bottom plate of crude oil tank and destroy situation, equipment, economic loss as caused by stress corrosion are reduced.
Description
Technical field
The present invention relates to the non-destructive testings of extent of corrosion, more particularly, refer to a kind of suitable for petroleum tank Corrosion of base plate
The nondestructive detection system and lossless detection method of degree.
Background technique
Petroleum is mixed based on hydrocarbon, flammable oily liquid with special odor, coloured.
Strictly speaking, the hydro carbons that petroleum is constituted using hydrogen and carbon is main component.The container for storing crude oil or other oil products is referred to as oil
Tank.The oil tank is mainly had crude oil storage tank, fuel reservoir, lubricating can, animals and plants grease storage tank etc. by structure.Mild steel,
Such as C-Mn steel, the structural material being widely used as in large-scale storage tank.After long-time deposits crude oil, one will form in pot bottom
The water of layer deposition.There are connate waters and external stress to have a great impact to the corrosion of mild steel for tank bottom.
The development of large-scale storage tank also has certain drawbacks to deposit while bringing China and storing petroleum resources on a large scale
Comparatively occupied area is larger for storage tank, maintenance management higher cost.Again because crude oil storage tank is chronically exposed to complex stress
And in corrosive environment, accumulates over a long period and generate the influence use of the micro-cracks such as spot corrosion.Crude oil is formed by prolonged deposition, pot bottom
One layer of connate water, impurity component has a great impact to the corrosion of bottom plate in connate water.
Under all failure modes, stress corrosion fracture (Stress Corrosion Cracking, SCC) especially severe
And it is dangerous.In order to ensure the security reliability of these structures, it is necessary to monitor the stress corrosion behavior of crude oil storage tank.And stress is rotten
Erosion is to make effective identification to its faulted condition thus the main reason for causing its failure, in time, correctly evaluate C-Mn
The degree of injury of steel crude oil storage tank provides foundation for its safe operation and life prediction.
As modern industry, production are increasingly at high speed, high efficiency development, the crude oil as the important storage facilities of fuel is stored up
Tank, main corrodible property are as follows:
1. the corrosion of crude oil storage tank is divided into internal corrosion and external corrosion.The external corrosion of crude oil storage tank is mainly atmosphere corruption
Erosion is corroded lighter compared to tank inside.The corrosive medium that tank inside different parts steel plate is contacted is different, extent of corrosion difference
It is very big.
2. in interior tank top, the H that is evaporated in crude oil2S, the gases such as HCl and by breathe air valve enter storage tank
Internal H2O、O2、CO2、SO2Equal corrosive environments condense into acid solution in tank deck, and tank deck steel plate is caused to corrode, corrode compared with
It is serious.
3. tank plate is main and crude oil contact, corrosion are relatively light in reservoir walls.
4. the corrosion of tank plate is mainly from connate water, corruption of the connate water to tank plate in storage tank lower part and bottom plate
It loses the most serious.Solution containing strong electrolytes such as a large amount of chloride, sulfide, acids in connate water, is easy to produce
Electrochemical corrosion.The precipitating water of tank bottom is the basic reason of bottom plate of crude oil tank corrosion.
Therefore, to ensure that crude oil storage tank is safely and reliably on active service, must stress to tank plate, corrosive environment simulate
And the stress corrosion faulted condition of tank body is detected, is judged, to carry out security evaluation.
Summary of the invention
In order to carry out the supervision of corrosion to in-service petroleum tank in real time, accident early warning, present invention design are carried out as early as possible
A kind of nondestructive detection system for the Corrosion of base plate situation meeting in-service petroleum tank.The nondestructive detection system is to petroleum tank bottom plate
Monitoring is divided into internal electrochemical analysis, external acoustic emission analysis；Stress corrosion of both compound acquisition information to crude oil storage tank
Situation and damage position carry out lossless differentiation, thus the case where carrying out corrosion damage judgement.Present system is not destroying original
In the case where oil tank, can accurately obtain generation, the crack initiation of the corrosion products film for the bottom plate being immersed in connate water with
And rupture event is reduced so as to judge the stress corrosion situation of bottom plate of crude oil tank and destroy situation due to stress corrosion
Caused by equipment, economic loss.
The present invention is a kind of nondestructive detection system of petroleum tank bottom plate corrosion product state, it is characterised in that: non-destructive testing
System includes electrochemical impedance spectroscopy acquisition subsystem (1), sound emission burst information acquisition subsystem (2) and Corrosion of base plate product
State judges subsystem (3)；
The electrochemical impedance spectroscopy acquisition subsystem (1) is made of electrode group and electrochemical workstation；The electrochemistry resistance
Anti- spectrum acquisition subsystem (1) acquires impedance spectrum by electrochemical workstation
The sound emission burst information acquisition subsystem (2) is by Acoustic radiating instrument, preamplifier and acoustic emission transducer group
At；Acoustic radiating instrument is used to acquire the demblee form information near bottom plate of crude oil tank；Preamplifier is used for each sound
The demblee form information of transmitter output carries out 40dB enhanced processing and forms sound emission amplification message；Acoustic emission transducer is used for institute
After stating sound emission amplification message progress A/D conversion process, acoustic emission energy spectrum is extracted
Petroleum tank connate water insole board corrosion product state judges subsystem (3) to the electrochemical impedance under acquisition time
Spectrum, acoustic emission energy spectrum are analyzed；
Step 1, mutation electrochemical impedance information are chosen；
Step 11, by the electrochemical impedance information PFI of the electrochemical workstation received output in impedance processing software
Construct impedance spectrum property curve；To obtain TAcquisitionUnder maximum frequency hmax, maximum phase angle dmax, maximum impedance intercept omax, most
Small frequency hmin, minimum phase angle dmin, minimum impedance intercept omin；
t0Time, t are played for the sampling timeQFor the only time in sampling time, t1For first sampling time point, t2It is
Two sampling time points, tqFor any one sampling time point, q is the identification number of sampling time point, tq-1For positioned at tqBefore
Sampling time point, tq+1For positioned at tqSampling time point later；
Step 12, by the electrochemical impedance information PFI and impedance spectrum class condition of the electrochemical workstation received output |
ha-hmax| > α and | da-dmin|≤β and | oa-omin|≤γ is compared, and obtains electrochemical impedance abrupt information
PFICorrosion products film generates；Execute step 7；
α is the step-length of frequency axis, and β is the step-length of phase angle axis, and γ is the step-length of logarithm impedance axis；
Step 2, burst sound emission number demblee form information are chosen；
By the sound emission number demblee form information AEI received according to abscissa be acquisition time section TAcquisition, ordinate is thing
Part counts EV, constructs rectangular coordinate system；Whether changed by the slope of a curve to parameter characterization each in rectangular coordinate system,
Corresponding sampled point is changed to select slope, obtains sound emission burst information AEICorrosion products film generates；Execute step 3；
Step 3, the sound emission divided stages based on slope variation time point；
The AEI obtained from step 2Corrosion products film generatesIn select slope exist variation sampled point, obtain the sampled point pair
The period for the sound emission burst information slope variation answered is denoted as sound emission-slope-period TSound-slope={ t1,t2,…,
tn, n ∈ Q；Execute step 4；
Step 4, the crack initiation of the corrosion products film based on absolute energy and the acoustic emission information of rupture obtain；
The sound emission burst information AEI that receiving step two obtainsCorrosion products film generates, and sound emission-slope-of receiving step three
Period TSound-slope={ t1,t2,…,tn}；It is acquisition time section T according to abscissaAcquisition, ordinate is in sound emission burst information
Absolute energy E, construct rectangular coordinate system；
Using absolute energy corrosion products film crack initiation class conditionTo the AEICorrosion products film generatesIt carries out
Processing obtains corrosion products film crack initiation acoustic emission information AEICrack initiation；Return step two；
Class condition is ruptured using absolute energy corrosion products filmAndTo described
AEICorrosion products film generatesIt is handled, obtains corrosion products film and rupture acoustic emission information AEICorrosion products film rupture；Execute step 5；
It indicates in acquisition time section TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQInterior Acoustic radiating instrument 23 is defeated
The average absolute energy in digital demblee form information AEI out, referred to as always-average absolute energy；
It indicates in sound emission-slope-period TSound-slope={ t1,t2,…,tnInterior AEICorrosion products film generatesIn it is flat
Equal absolute energy, referred to as period-average absolute energy；
Step 5, the corrosion products film crack initiation acquisition of information based on Ring-down count；
Step 51, the corrosion products film in receiving step four ruptures acoustic emission information AEICorrosion products film rupture, with Ring-down count CC
Rectangular coordinate system is constructed using the duration DU of the Ring-down count CC as abscissa for ordinate；
Ring ratioRefer to the ratio between Ring-down count value CC and duration DU；
Step 52, the ring ratio for calculating each sampled point obtains ring ratio collection
Step 53, by AEICorrosion products film ruptureIn each sampled point ring ratio using the ring of ring mean ratio corrosion produce
Object film crack initiation class condition is analyzed, and corrosion products film crack initiation acoustic emission information is on the one hand obtainedReturn step two；
On the other hand it is obtained by using ring mean ratio ring corrosion products film crack initiation and rupture class condition
There is the acoustic emission information AEI of corrosion products film crack initiation and rupture simultaneouslyGerminating and rupture；Execute step 6；
The ring mean ratio ring corrosion products film crack initiation class condition refers to holds in preceding half maximum
Continuous time value DUmaxIn range, under the identical duration, there are the maximum Ring-down count values of any one sampled pointWith this
Average Ring-down count CC under durationIt is averageRatio be less than or equal to 2, that is, existWhen
The ring mean ratio ring corrosion products film crack initiation and rupture class condition refer in preceding half
Maximum duration value DUmaxIn range, under the identical duration, there are the maximum Ring-down count values of any one sampled pointWith Ring-down count CC average under the durationIt is averageRatio be greater than 2, that is, existWhen
The acoustic emission information of step 6, corrosion products film crack initiation and rupture based on bispectrum waveform obtains；
The corrosion products film crack initiation of receiving step five and the acoustic emission information AEI of ruptureGerminating and rupture, and it is double to normalize
Frequency is ordinate, using frequency AF as abscissa, constructs rectangular coordinate system；Calculate the quantity FP at peakPeak, on the one hand can be by double
Spectrum corrosion products film crack initiation class condition judges corrosion products film crack initiation acoustic emission informationIt returns
Step 2；
On the other hand class condition can be ruptured by corrosion products film judges that corrosion products film ruptures acoustic emission informationExecute step 7；
AFT acquisitionIt indicates in TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQUnder all average frequency AF injury tolerance
Frequency；
The bispectrum corrosion products film crack initiation class condition refers to that the maximum average frequency of any one sampled point is greater than 0
When be calculated as a peak, the FP at the peak at this timePeakQuantity is 1, and in all injury tolerance frequency AFT acquisitionUpper FPPeak≡1；
The corrosion products film rupture class condition refers to be calculated as when the maximum average frequency of any one sampled point is greater than 0
One peak, the at this time FP at the peakPeakQuantity is 1, i.e., in all injury tolerance frequency AFT acquisitionUpper FPPeak> 1；
Step 7, the acquisition of information based on the rupture of the corrosion products film of impedance spectrum and event count；
Step 71, by the electrochemical impedance information PFI in the step of receiving oneCorrosion products film generatesUsing phase angle D as ordinate, adopt
Collect period TAcquisitionFor abscissa, rectangular coordinate system is constructed；
Step 72, by the sound emission burst information in the step of receiving twoIt is with event count EV
Ordinate, acquisition time section TAcquisitionFor abscissa, rectangular coordinate system is constructed；
Step 73, class condition is ruptured by counting slope-phase angle analysis corrosion products film, on the one hand can obtains corruption
It loses Product Films and ruptures Electrochemistry Information
On the other hand corrosion products film rupture acoustic emission information can be obtainedIf electrode is layouted and is adopted
Sampling point is overlapped, then shows that rupture occurs in this point, it should export early warning information；
The counting slope-phase angle analysis corrosion products film ruptures class condition and refers in event count-time relationship,
Event count EV- time TAcquisitionTime point of linear relationship when changing that i.e. slope changes, in phase angle D- time TAcquisition
In relationship, corresponding angle values d is maximum phase angle dmax, i.e., in acquisition time section TAcquisition,Work as lq≠lq+1,Wherein, the lqIt is
tqCorresponding slope, jqIt is tqCorresponding intercept, lq+1It is tq+1Corresponding slope, jq+1It is tq+1Corresponding intercept.
The advantages of nondestructive detection system of the present invention, is:
1. the non-destructive testing of different modes inside and outside crude oil storage tank, i.e. the disposed outside sound in the crude oil storage tank being located at bottom plate
Transmitting probe and Acoustic radiating instrument carry out acoustic emission information acquisition, and the bottom plate of aqueous corrosion will be deposited in crude oil storage tank as work
Electrode carries out electrochemical impedance spectroscopy information collection, and under identical acquisition time, present system can obtain corrosion products film
Germinating to rupture process.
2. obtaining change in the instantaneous impedance information using frequency, phase angle and impedance intercept in electrochemical analysis, data are reduced
Data redundancy caused by accumulative improves the precision of information of corrosion products film generation.
3. the comprehensive analysis and judgement of Applied Electrochemistry change in the instantaneous impedance information and sound emission burst information of the present invention, can be polygonal
Degree, stage construction, the more accurately generation of the corrosion products film to crude oil storage tank in sedimentary water environment, corrosion products film crackle are sprouted
The case where raw and corrosion products film ruptures carries out analysis and early warning.
4. periodically non-destructive monitoring can be carried out to the crude oil storage tank in sedimentary water environment using the present invention, there is heavy corrosion
When situation can timely early warning, therefore property loss can be greatly reduced, guarantee personnel, Environmental security and economic benefit.
Detailed description of the invention
Fig. 1 is a kind of structural block diagram of the nondestructive detection system of petroleum tank bottom plate corrosion product state of the present invention.
Fig. 2 is the process flow diagram that petroleum tank bottom plate corrosion product state of the present invention judges subsystem.
Fig. 3 is phase angle-log-frequency figure in the impedance power spectrum of electrochemical workstation acquisition of the present invention.
Fig. 4 is logarithm impedance-log-frequency figure in the impedance power spectrum of electrochemical workstation acquisition of the present invention.
Fig. 5 is to add up event after corrosion products film generation in the acoustic emission energy spectrum of acoustic emission transducer acquisition of the present invention to dash forward
Become figure.
When Fig. 6 is the slope mutation of accumulative event count figure in the acoustic emission energy spectrum of acoustic emission transducer acquisition of the present invention
Between section figure.
Fig. 7 is absolute energy corrosion products film crack initiation in the acoustic emission energy spectrum of acoustic emission transducer acquisition of the present invention
Class condition figure.
Fig. 8 is absolute energy corrosion products film rupture classification in the acoustic emission energy spectrum of acoustic emission transducer acquisition of the present invention
Information drawing.
Fig. 9 is the ring meter of corrosion products film crack initiation in the acoustic emission energy spectrum of acoustic emission transducer acquisition of the present invention
Number figure.
Figure 10 is corrosion products film crack initiation and rupture in the acoustic emission energy spectrum of acoustic emission transducer acquisition of the present invention
Ring-down count figure.
Figure 11 is the bispectrum of corrosion products film crack initiation in the acoustic emission energy spectrum of acoustic emission transducer acquisition of the present invention
Analysis chart.
Figure 12 is the double-spectrum analysis of corrosion products film rupture in the acoustic emission energy spectrum of acoustic emission transducer acquisition of the present invention
Figure.
Figure 13 is the phase angle analysis chart of corrosion products film rupture.
Figure 14 is the analysis of accounts figure of corrosion products film rupture.
Specific embodiment
Below in conjunction with drawings and examples, the present invention is described in further detail.
In the present invention, multiple sampling time point t constitute acquisition time section TAcquisition, then have TAcquisition={ t0,t1,t2,…,tq-1,
tq,tq+1,…,tQ, t0Time, t are played for the sampling timeQFor the only time in sampling time, t1For first sampling time point, t2
For second sampling time point, tqFor any one sampling time point, q is the identification number of sampling time point, tq-1For positioned at tqIt
Preceding sampling time point, tq+1For positioned at tqSampling time point later.In the present invention, tq-1,tq,tq+1It is adopted for continuous three
Sample time point.For a period of time (referred to as previous stage) before any one time point, such as t1To tq-1When
Between section, be also possible to t0To t2Period, be also possible to t0To tq+1Period etc..For positioned at any one time point
Later to tQA period of time (referred to as the latter half), such as be located at tq-1T laterqTo tQPeriod, be also possible to be located at
t2T later3To tqPeriod, be also possible to be located at tq-1T laterqTo tq+1Period etc..To belong to TAcquisitionIn
A period of time between any two time point.
In the present invention, working electrode of the bottom plate inside petroleum tank as electrochemical impedance information collection, at the bottom
Multiple sampled points are set on plate, and sampled point is referred to as electrode in the present invention and layouts, and multiple electrodes, which are layouted, is denoted as electrode cloth point set
PFI_P={ P1,P2,…,Pa,…PA, P1It layouts for first electrode, P2It layouts for second electrode, PaFor any one electricity
Pole is layouted, and a is the identification number that electrode is layouted, PAIt layouts for the last one electrode, a ∈ A.Each electrode is layouted through electrochemical operation
It stands 12 output electrochemical impedance information all the way.
Electrochemical workstation 12 export any one electrode layout P electrochemical impedance information by characteristic frequency h (unit
Hz), the corresponding phase angle d (unit degree) of the characteristic frequency h and logarithm impedance curve in Y-axis intercept o (unit constant guiding principle,
To indulge intercept) composition, P (h, d, o) is expressed as using aggregate form.For all electrode cloth exported through electrochemical workstation 12
Point PFI_P={ P1,P2,…,Pa,…PAElectrochemical impedance information be denoted as
P1(h1,d1,o1) it is that first electrode is layouted P1Electrochemical impedance information；Wherein, h1It layouts for first electrode
P1Characteristic frequency, d1It layouts P for first electrode1The h1Corresponding phase angle, o1It layouts P for first electrode1Logarithm
Intercept of the impedance curve in Y-axis.
P2(h2,d2,o2) it is that second electrode is layouted P2Electrochemical impedance information；Wherein, h2It layouts for second electrode
P2Characteristic frequency, d2It layouts P for second electrode2The h2Corresponding phase angle, o2It layouts P for second electrode2Logarithm
Intercept of the impedance curve in Y-axis.
Pa(ha,da,oa) it is that any one electrode is layouted PaElectrochemical impedance information；Wherein, haFor any one electrode
Layout PaCharacteristic frequency, daIt layouts P for any one electrodeaThe haCorresponding phase angle, oaIt layouts for any one electrode
PaIntercept of the logarithm impedance curve in Y-axis.
PA(hA,dA,oA) it is that the last one electrode is layouted PAElectrochemical impedance information；Wherein, hAFor the last one electrode
Layout PACharacteristic frequency, dAIt layouts P for the last one electrodeAThe hACorresponding phase angle, oAIt layouts for the last one electrode
PAIntercept of the logarithm impedance curve in Y-axis.
In the present invention, each Acoustic radiating instrument 21 that petroleum tank bottom plate outer wall surrounding is arranged in is known as a sampled point,
Multiple sampled points are denoted as sampling point set AEI_S={ S1,S2,…,Sb,…,SB, S1For first sampled point, S2It is adopted for second
Sampling point, SbFor any one sampled point, b is the identification number of sampled point, SBFor the last one sampled point, b ∈ B.Each sampled point
Information exports after preamplifier 22 amplifies 40dB to Acoustic radiating instrument 23.
It include ENERGY E (unit in the digital demblee form information for any one sampled point S that acoustic emission transducer 23 exports
Voltage is multiplied by the time, and voltage is volt, and the time is millisecond), average frequency AF (unit Hz), Ring-down count CC (unit) and event
Four parameters of EV (unit) are counted, S (E, AF, CC, EV) is expressed as using aggregate form.The institute exported for Acoustic radiating instrument 23
There is sampled point AEI_S={ S1,S2,…,Sb,…,SBDigital demblee form information be denoted as
S1(E1,AF1,CC1,EV1) it is first sampled point S1Digital demblee form information；Wherein, E1It is sampled for first
Point S1Energy, AF1For first sampled point S1Average frequency, CC1For first sampled point S1Ring-down count, EV1It is
One sampled point S1Event count.
S2(E2,AF2,CC2,EV2) it is second sampled point S2Digital demblee form information；Wherein, E2It is sampled for second
Point S2Energy, AF2For second sampled point S2Average frequency, CC2For second sampled point S2Ring-down count, EV2It is
Two sampled point S2Event count.
Sb(Eb,AFb,CCb,EVb) it is any one sampled point SbDigital demblee form information；Wherein, EbFor any one
Sampled point SbEnergy, AFbFor any one sampled point SbAverage frequency, CCbFor any one sampled point SbRing-down count,
EVbFor any one sampled point SbEvent count.
SB(EB,AFB,CCB,EVB) it is the last one sampled point SBDigital demblee form information；Wherein, EBFor the last one
Sampled point SBEnergy, AFBFor the last one sampled point SBAverage frequency, CCBFor the last one sampled point SBRing-down count,
EVBFor the last one sampled point SBEvent count.
Composition about the nondestructive detection system for being suitable for petroleum tank bottom plate corrosion products film
It is shown in Figure 1, a kind of crack initiation for petroleum tank bottom plate corrosion products film that the present invention designs and the nothing of rupture
Damage detection system comprising have: electrochemical impedance spectroscopy acquisition subsystem 1, sound emission burst information acquisition subsystem 2 and bottom plate are rotten
Erosion product state judges subsystem 3；
The electrochemical impedance spectroscopy acquisition subsystem 1 includes electrode group 11 and electrochemical workstation 12, electrochemical operation
12 one side of standing apply different angular frequency sine-wave current signals to electrode group 11, on the other hand export the frequency under different angular frequencies
Ring function, i.e. electrochemical impedance informationGive corrosion product shape
State judges subsystem 3.In the present invention, electrochemical workstation 12 is worked using three electrodes, i.e. working electrode, reference electricity
Pole and auxiliary electrode.The working electrode is petroleum tank bottom plate.
The sound emission burst information acquisition subsystem 2 includes that Acoustic radiating instrument 21, preamplifier 22 and sound emission are changed
It can device 23.Acoustic radiating instrument 21 is used to acquire the demblee form information near bottom plate of crude oil tank；Preamplifier 22 is used for will be each
The demblee form information of a Acoustic radiating instrument output carries out 40dB enhanced processing and forms sound emission amplification message；Acoustic emission transducer
After 23 for carrying out A/D conversion process for the sound emission amplification message, extract for described per sound emission amplification all the way
The digital demblee form information of informationIt exports and sentences to corrosion product state
Disconnected subsystem 3.In the present invention, include in digital demblee form information absolute energy AE, average frequency AF, Ring-down count CC and
Four parameters of event count EV；
The corrosion product state judges subsystem 3 for the frequency response function under the different angular frequencies receivedWith digital demblee form informationThe state judgement for carrying out corrosion products film, to judge difference
The bottom plate at position is corrosion products film germinating or corrosion products film state of rupture in the environment of connate water；If described
Corrosion products film germinates state, then continues to be monitored sampled point；If the corrosion products film state of rupture, then generate
Pre-warning signal, early warning is to petroleum tank using safe.
Hardware connection: electrode group 11 and electrochemical workstation 12 pass through cable connection；Acoustic emission preamplifier 22 passes through
Cable is connect with the input terminal of the output end of Acoustic radiating instrument 21 and acoustic emission transducer 23 respectively；The signal of electrochemical workstation 12
The signal output end of output end and acoustic emission transducer 23 is connected on the serial ports of computer by R323 serial ports, corrosion product shape
State judges that subsystem 30 is stored in the memory of computer.
Flow chart as shown in Figure 2 is the processing step that subsystem 3 is judged for corrosion product state
Step 1, mutation electrochemical impedance information are chosen；
Step 11, the electrochemical impedance information electrochemical workstation 12 received exportedImpedance spectrum property curve is constructed in impedance processing software；
To obtain TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQUnder maximum frequency hmax, minimum frequency hmin, maximum phase angle
dmax, minimum phase angle dmin, maximum impedance intercept omax, minimum impedance intercept omin。
The impedance processing software is the electrochemical impedance spectroscopy fitting software of U.S. Echem Software company exploitation, English
Text is referred to as Zsimpwin.
Step 12, the electrochemical impedance information electrochemical workstation 12 received exportedIt is compared with impedance spectrum class condition, obtains electrochemistry
Change in the instantaneous impedance informationExecute step 7；
In the present invention, the impedance spectrum class condition is | ha-hmax| > α and | da-dmin|≤β and | oa-omin|≤γ。
Maximum frequency hmax, minimum phase angle dmin, minimum impedance intercept omin, α is the step-length of frequency axis, and β is the step-length of phase angle axis, and γ is
The step-length of logarithm impedance axis.
Step 2, burst sound emission number demblee form information are chosen；
The sound emission number demblee form information that will be receivedIt presses
It is acquisition time section T according to abscissaAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQ, ordinate is event count EV, building
Rectangular coordinate system；Whether changed by the slope of a curve to parameter characterization each in rectangular coordinate system, to select slope
Corresponding sampled point is changed, sound emission burst information is obtainedExecute step 3；
Step 3, the sound emission divided stages based on slope variation time point；
It is obtained from step 2In select
There is the sampled point of variation in slope, obtain the period of the corresponding sound emission burst information slope variation of the sampled point, be denoted as
Sound emission-slope-period TSound-slope={ t1,t2,…,tn, n ∈ Q；Execute step 4；
The acoustic emission information of step 4, germinating with the rupture of the corrosion products film based on absolute energy obtains；
The sound emission burst information that receiving step two obtainsAnd sound emission-slope-of receiving step three
Period TSound-slope={ t1,t2,…,tn}；It is acquisition time section T according to abscissaAcquisition={ t0,t1,t2,…,tq-1,tq,
tq+1,…,tQ, ordinate is the absolute energy E in sound emission burst information, constructs rectangular coordinate system；
Using absolute energy corrosion products film crack initiation class conditionTo describedIt is handled, obtains corrosion products film crackle and sprout
Raw acoustic emission informationReturn step two；
Class condition is ruptured using absolute energy corrosion products film It is handled, obtains corrosion products film rupture sound
Transmitting informationExecute step 5；
It indicates in acquisition time section TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQInterior Acoustic radiating instrument 23 is defeated
Digital demblee form information outIn average absolute energy, referred to as
For total-average absolute energy；
It indicates in sound emission-slope-period TSound-slope={ t1,t2,…,tnInIn average absolute energy, referred to as time
Section-average absolute energy；
In the present invention, the absolute energy corrosion products film crack initiation class condition refers to the exhausted of any one sampled point
To energyGreater than period-average absolute energyI.e.
In the present invention, the absolute energy corrosion products film rupture class condition refers to the absolute energy of any one sampled point
AmountMeetMore than or equal to total-average absolute energyTwo times, andWithIt is unequal, i.e.,
Step 5, the corrosion products film crack initiation acquisition of information based on Ring-down count；
Step 51, the corrosion products film in receiving step four ruptures acoustic emission informationUsing Ring-down count CC as ordinate, with the vibration
The duration DU that bell counts CC is abscissa, constructs rectangular coordinate system；
In the present invention, ring ratioRefer to the ratio between Ring-down count value CC and duration DU；
Step 52, the ring ratio for calculating each sampled point obtains ring ratio collection
Step 53, willIn each sampled point
Ring ratio analyzed using ring mean ratio ring corrosion products film crack initiation class condition, on the one hand obtain rotten
Lose Product Films crack initiation acoustic emission informationReturn step
Two；
On the other hand it is obtained by using ring mean ratio ring corrosion products film crack initiation and rupture class condition
There is the acoustic emission information of corrosion products film crack initiation and rupture simultaneouslyExecute step 6；
In the present invention, the ring mean ratio ring corrosion products film crack initiation class condition refers in the first two point
One of maximum duration value DUmaxIn range, under the identical duration, there are the maximum Ring-down count values of any one sampled pointWith Ring-down count CC average under the durationIt is averageRatio be less than or equal to 2, that is, existWhen
In the present invention, the ring mean ratio ring corrosion products film crack initiation and rupture class condition refer to
Preceding half maximum duration value DUmaxIn range, under the identical duration, there are the maximum rings of any one sampled point
Count valueWith Ring-down count CC average under the durationIt is averageRatio be greater than 2, that is, existWhen
The acoustic emission information of step 6, corrosion products film crack initiation and rupture based on bispectrum waveform obtains；
The corrosion products film crack initiation of receiving step five and the acoustic emission information of ruptureAnd to normalize bifrequency as ordinate, with frequency
AF is abscissa, constructs rectangular coordinate system；Calculate the quantity FP at peakPeak, on the one hand can be sprouted by bispectrum corrosion products film crackle
Raw class condition judges corrosion products film crack initiation acoustic emission informationReturn step two；
On the other hand class condition can be ruptured by corrosion products film judges that corrosion products film ruptures acoustic emission informationExecute step 7；
AFT acquisitionIt indicates in TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQUnder all average frequency AF injury tolerance
Frequency.
In the present invention, the bispectrum corrosion products film crack initiation class condition refers to that the maximum of any one sampled point is flat
Equal frequency is calculated as a peak when being greater than 0, at this time the FP at the peakPeakQuantity is 1, and in all injury tolerance frequency AFT acquisitionUpper FPPeak
≡1。
In the present invention, the corrosion products film rupture class condition refers to that the maximum average frequency of any one sampled point is big
A peak is calculated as when 0, at this time the FP at the peakPeakQuantity is 1, i.e., in all injury tolerance frequency AFT acquisitionUpper FPPeak> 1.
Step 7, the acquisition of information based on the rupture of the corrosion products film of impedance spectrum and event count；
Step 71, by the electrochemical impedance information in the step of receiving oneUsing phase angle D as ordinate, acquisition time section
TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQIt is abscissa, construct rectangular coordinate system；
Step 72, by the sound emission burst information in the step of receiving twoUsing event count EV as ordinate, acquisition time section
TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQIt is abscissa, construct rectangular coordinate system；
Step 73, class condition is ruptured by counting slope-phase angle analysis corrosion products film, on the one hand can obtains corruption
It loses Product Films and ruptures Electrochemistry Information
On the other hand corrosion products film rupture acoustic emission information can be obtainedIt is overlapped, shows with sampled point if electrode is layouted
There is rupture in this point, it should export early warning information；
The counting slope-phase angle analysis corrosion products film ruptures class condition and refers in event count-time relationship,
Event count EV- time TAcquisitionTime point of linear relationship when changing that i.e. slope changes, in phase angle D- time TAcquisition
In relationship, corresponding angle values d is maximum phase angle dmax, i.e., in acquisition time section TAcquisition={ t0,t1,t2,…,tq-1,tq,
tq+1,…,tQ, Work as lq≠lq+1,Its
In, the lqIt is tqCorresponding slope, jqIt is tqCorresponding intercept, lq+1It is tq+1Corresponding slope, jq+1It is tq+1Institute is right
The intercept answered.
Embodiment 1
Storage tank is chronically exposed in complex stress and corrosive environment, is accumulated over a long period and is generated the influence use of the micro-cracks such as spot corrosion.
For crude oil by prolonged deposition, pot bottom forms one layer of connate water, corrosion of the impurity component to petroleum tank bottom plate in connate water
Have a great impact.The present embodiment 1 is under experimental situation, and the connate water of selection is what oil company provided, and ingredient is (dense
Degree): Cl-/ (g/L) is 1.2024,It is 1,It is 0.75, Ca2+/ (g/L) is 0.35,
Mg2+/ (g/L) is 0.21.
Select the ingredient of petroleum tank bottom plate:
| Ingredient | C | Si | Mn | P | S | Nb | V | Ti | Cr | Ni | Cu | Fe |
| Content (wt%) | 0.20 | 0.50 | 1.70 | 0.035 | 0.03 | 0.06 | 0.10 | 0.15 | 0.2 | 0.4 | 0.3 | balance |
The signal output end of Acoustic radiating instrument and the input terminal of preamplifier connect, and the output end and sound of preamplifier are sent out
The input terminal connection for penetrating energy converter, each electronic equipment for connecting sound emission subsystem carry out the acquisition of acoustic emission signal.
Bottom plate is working electrode, and metal block is reference electrode, and graphite is auxiliary electrode, and the quantity of three electrodes is identical,
It is connect with cable with electrochemical workstation.Bottom plate is immersed in connate water.
At the different location of bottom plate, the other end of some cables is connected on electrochemical workstation a plurality of cable connection,
The other end of other cables is connected on Acoustic radiating instrument.
Step 1, mutation electrochemical impedance information are chosen；
The signal of the collected multiple sampled points of electrochemical workstation as shown in figure 3 and figure 4, is established rectangular co-ordinate by ginseng
System establishes to obtain rectangular coordinate system figure according to phase angle-log-frequency, logarithm impedance-log-frequency.Pass through the analysis to figure, energy
It is enough clearly to observe appearance of the corrosion products film under different test periods.
Step 11, the electrochemical impedance information electrochemical workstation 12 received exportedIt is special that impedance spectrum is constructed in impedance processing software
Linearity curve；To obtain TAcquisition={ t0, t1, t2..., tq-1, tq, tq+1..., tQUnder maximum frequency hmax, maximum phase angle dmax,
Maximum impedance intercept omax, minimum frequency hmin, minimum phase angle dmin, minimum impedance intercept omin；
The impedance processing software is the electrochemical impedance spectroscopy fitting software of U.S. Echem Software company exploitation, English
Text is referred to as Zsimpwin.
It is in order to clear that middle electrode, which is layouted,
Illustrate and enumerate, is which electrode cloth points, such as P with the number shown in subscript3(h3, d3, o3) it is third electrode cloth
The information of point acquisition.
Step 12, the electrochemical impedance information electrochemical workstation 12 received exportedIt is compared, obtains with impedance spectrum class condition
To electrochemical impedance abrupt informationIt executes
Step 7；
In the present invention, the impedance spectrum class condition is | ha-hmax| > α and | da-dmin|≤β and | oa-omin|≤γ。
Maximum frequency hmax, minimum phase angle dmin, minimum impedance intercept omin, a is the step-length of frequency axis, and β is the step-length of phase angle axis, and γ is
The step-length of logarithm impedance axis.
In the present embodiment, due to P1(h1, d1, o1) it is unsatisfactory for impedance spectrum class condition, P2(h2, d2, o2) ..., Pa(ha,
da, oa) ..., PA(hA, dA, oA) meet impedance spectrum class condition, then
Step 2, burst sound emission number demblee form information are chosen；
It is shown in Figure 5, the signal of the collected multiple sampled points of acoustic emission transducer is established into rectangular coordinate system, foundation
Corrosion products film adds up event mutation number to observe whether slope of a curve changes after generating.In corrosion product film surface
When not having an obvious crackle and there are sound emissions when obvious crackle to have visibly different feature, as signal type, signal amplitude and
Signal energy etc..The appearance of Product Films internal fissure also will affect the propagation of acoustic emission signal simultaneously.
The sound emission number demblee form information that will be receivedIt is acquisition time according to abscissa
Section TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQ, ordinate is event count EV, constructs rectangular coordinate system；By right
Whether the slope of a curve of each parameter characterization changes in rectangular coordinate system, changes corresponding sampling to select slope
Point obtains sound emission burst informationExecute step
Three；
In the present embodiment, due to S1(E1,AF1,CC1,EV1) time counting EV slope do not change, belong in the AEI
Remaining sampled point time counting EV slope occur variation, then have AEICorrosion products film generates.For the AEICorrosion products film generatesIn adopt
The number of the sampled point collected with the number of subscript be which sampled point, such as S9(E9,AF9,CC9,EV9) it is the 9th sampled point
Information.
Step 3, the sound emission divided stages based on slope variation time point；
It is shown in Figure 6, the signal of the collected multiple sampled points of acoustic emission transducer is established into rectangular coordinate system, foundation
Add up the slope mutation time section of event count figure to observe whether slope of a curve changes.It is laggard through different soaking times
The accumulative number of acoustic emission signal in row EIS test process.It is more when accumulated signal number was than 11 days at 24 days, increase slope
It is bigger.At 24 days, rapid drawdown has occurred near 430s；And this catastrophic behavior occurs earlier at 11 days.At the end of test,
11 days styles detect 3.7 × 104 signals, and 24 days whens have 4.05 × 104.
It is obtained from step 2In event meter
Number EV and acquisition time section TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQSlope variation, it is corresponding to obtain sampled point
The time point of sound emission burst information slope variation is denoted as sound emission-slope-period TSound-slope={ t1,t2,…,tn, n
∈Q；Execute step 4；
Step 4, the crack initiation of the corrosion products film based on absolute energy and the acoustic emission information of rupture obtain；
Absolute energy corrosion products film crack initiation class condition figure shown in Figure 7 counted 4000 at 11 days in figure
Horizontal line be one demarcate, positioned at 4000 count on be crack initiation.In order to further identify the state of corrosion products film
Absolute energy corrosion products film shown in Figure 8 ruptures class condition figure, and at 24 days, the right half for counting 5000 occurred
Intensive counting.Absolute energy when 320MPa under difference soaking time, vertical line is related to the germinating of corrosion products film crackle,
It in testing time in 560s, has only burst out at two time points this kind of signal, has illustrated that crackle was at 11 days in general
Through starting to germinate, but it is small.At 24 days, the signal on first stage horizontal line was related to crack initiation, Er Qie
It is confirmed in SEM.Signal on second stage horizontal line is related with the extension of crackle.Crack initiation when can see 24 days
It is more when relevant signal was than 11 days.Signal under horizontal line is considered back end noise signal.
The sound emission burst information that receiving step two obtainsAnd receiving step
Three sound emission-slope-period TSound-slope={ t1,t2,…,tn}；It is acquisition time section T according to abscissaAcquisition={ t0,t1,
t2,…,tq-1,tq,tq+1,…,tQ, ordinate is the absolute energy E in sound emission burst information, constructs rectangular coordinate system；It adopts
With absolute energy corrosion products film crack initiation class condition to the AEICorrosion products film generatesIt is handled, obtains corrosion products film and split
Line germinates acoustic emission informationReturn step two；
Using absolute energy corrosion products film rupture class condition to the AEICorrosion products film generatesIt is handled, obtains corrosion products film rupture
Acoustic emission information
It indicates in acquisition time section TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQInterior Acoustic radiating instrument 23 is defeated
Digital demblee form information outIn average absolute energy, referred to as
For total-average absolute energy.
It indicates in sound emission-slope-period TSound-slope={ t1,t2,…,tnInIn it is average exhausted
To energy, referred to as period-average absolute energy.
In the present invention, the absolute energy corrosion products film crack initiation class condition refers to the exhausted of any one sampled point
To energyGreater than period-average absolute energyI.e.
In the present invention, the absolute energy corrosion products film rupture class condition refers to the absolute energy of any one sampled point
AmountMeetMore than or equal to total-average absolute energyTwo times, andWithIt is unequal, i.e.,
In the present embodiment, due to S2(E2,AF2,CC2,EV2) in the sound emission-slope-period TSound-Slope=
{t1,t2,…,tnOutside period for delimiting, and belong to the AEICorrosion products film generatesIn the absolute energy of remaining sampled point belong to institute
State sound emission-slope-period TSound-slope={ t1,t2,…,tnDelimit period in, then have AEICrack initiation。
In the present embodiment, due to S2(E2,AF2,CC2,EV2),S3(E3,AF3,CC3,EV3), it is rotten to be unsatisfactory for absolute energy E
It loses Product Films and ruptures class condition, S4(E4,AF4,CC4,EV4),…,Sb(Eb,AFb,CCb,EVb),…,SB(EB,AFB,CCB,
EVB) meet absolute energy E corrosion products film rupture class condition, then AEICorrosion products film rupture。
Step 5, the corrosion products film crack initiation acquisition of information based on Ring-down count；
Referring to Fig. 9 and corrosion products film shown in Fig. 10 respectively in 11 days and 24 days Ring-down count figures, style (bottom plate)
Variation of the sound emission Ring-down count to the duration at 11 days and 24 days.It can be seen that all signals are mainly assembled at 11 days
It is taken in a main item；And at 24 days other than main band, positioned at main band upper left side, there are also a large amount of Ring-down counts are higher
Signal.
Step 51, the sound emission burst information in receiving step twoWith Ring-down count
CC is ordinate, using the duration DU of the Ring-down count CC as abscissa, constructs rectangular coordinate system；
In the present invention, ring ratioRefer to the ratio between Ring-down count value CC and duration DU.
Step 52, the ring ratio for calculating each sampled point obtains ring ratio collection
Step 53, willEach of adopt
The ring ratio of sampling point is analyzed using ring mean ratio ring corrosion products film crack initiation class condition, is on the one hand obtained
Obtain corrosion products film crack initiation acoustic emission informationReturn step two；It is another
Aspect has corrosion by using ring mean ratio ring corrosion products film crack initiation and rupture class condition acquisition simultaneously
The acoustic emission information of Product Films crack initiation and ruptureExecute step 6；
In the present invention, the ring mean ratio ring corrosion products film crack initiation class condition refers in the first two point
One of maximum duration value DUmaxIn range, under the identical duration, there are the maximum Ring-down count values of any one sampled pointWith Ring-down count CC average under the durationIt is averageRatio be less than or equal to 2, that is, existWhen
In the present invention, the ring mean ratio ring corrosion products film crack initiation and rupture class condition refer to
Preceding half maximum duration value DUmaxIn range, under the identical duration, there are the maximum rings of any one sampled point
Count valueWith Ring-down count CC average under the durationIt is averageRatio be greater than 2, that is, existWhen
In the present embodiment, due to S2(E2,AF2,CC2,EV2),S3(E3,AF3,CC3,EV3),S4(E4,AF4,CC4,EV4)
It is unsatisfactory for the corrosion products film crack initiation class condition of ring ratio, S5(E5,AF5,CC5,EV5),…,Sb(Eb,AFb,CCb,
EVb),…,SB(EB,AFB,CCB,EVB) the corrosion products film crack initiation class condition that meets ring ratio, then haveDue to S2(E2, AF2, CC2, EV2), S3(E3, AF3, CC3, EV3), S4(E4, AF4, CC4, EV4), it is unsatisfactory for S5
(E5, AF5, CC5, EV5) ring ratio corrosion products film crack initiation and rupture class condition, S6(E6,AF6,CC6,
EV6),…,Sb(Eb,AFb,CCb,EVb),…,SB(EB,AFB,CCB,EVB) meet the corrosion products film crack initiation of ring ratio
With rupture class condition, then there is AEIGerminating and rupture。
The acoustic emission information of step 6, corrosion products film crack initiation and rupture based on bispectrum waveform obtains；
Two kinds of bispectrum waveform (as shown in figure 11) is obtained using double-spectrum analysis software (analysis waveform) analysis.It is unimodal
Signal reaches peak value at 35kHz, sharply declines until noise level later.And multimodal signal has two at 35kHz and 80kHz
A main peak (as shown in figure 12) furthermore has one Qiang Feng at 340kHz.It is located at the letter that main item takes low Ring-down count in figure
Number mainly unimodal signal, and remaining is mainly multimodal signal.According to the judgement of front, it is believed that multimodal/high Ring-down count letter
Number derive from crackle extension.And main band/unimodal signal has been mingled with crack initiation signal and noise signal.As it can be seen that passing through sound
Lift-off technology can effective analyzing film rupture process, play an important role to research and application material corrosion process.
There is the acoustic emission information of corrosion products film crack initiation and rupture simultaneously in receiving step fiveTo normalize double frequency
Rate is ordinate, using frequency AF as abscissa, constructs rectangular coordinate system；Calculate the quantity FP at peakPeak, on the one hand can pass through bispectrum
Corrosion products film crack initiation class condition judges corrosion products film crack initiation acoustic emission informationReturn step two；It is another
Aspect can be ruptured class condition by corrosion products film and judge that corrosion products film ruptures acoustic emission informationExecute step 7；
AFT acquisitionIt indicates in TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQUnder all average frequency AF injury tolerance
Frequency.
In the present invention, the bispectrum corrosion products film crack initiation class condition refers to that the maximum of any one sampled point is flat
Equal frequency is calculated as a peak when being greater than 0, at this time the FP at the peakPeakQuantity is 1, and in all injury tolerance frequency AFT acquisitionUpper FPPeak
≡1。
In the present invention, the corrosion products film rupture class condition refers to that the maximum average frequency of any one sampled point is big
A peak is calculated as when 0, at this time the FP at the peakPeakQuantity is 1, i.e., in all injury tolerance frequency AFT acquisitionUpper FPPeak> 1.
In the present embodiment, due to S6(E6,AF6,CC6,EV6) it is unsatisfactory for the corrosion products film crack initiation point of double-spectrum analysis
Class condition, S7(E7,AF7,CC7,EV7),…,Sb(Eb,AFb,CCb,EVb),…,SB(EB,AFB,CCB,EVB) meet double-spectrum analysis
Corrosion products film crack initiation class condition, then haveDue to S6(E6,AF6,CC6,EV6),S7(E7,AF7,
CC7,EV7), it is unsatisfactory for the corrosion products film rupture class condition of double-spectrum analysis, S8(E8,AF8,CC8,EV8),…,Sb(Eb,AFb,
CCb,EVb),…,SB(EB,AFB,CCB,EVB) meet double-spectrum analysis corrosion products film rupture class condition, then have
Step 7, the acquisition of information based on the rupture of the corrosion products film of impedance spectrum and event count；
The phase angle analysis chart of corrosion products film rupture shown in Figure 13, wherein black curve is to meet corrosion products film
Phase angle-time graph of class condition is ruptured, it is about 430 seconds that maximum phase angle, which corresponds to the time,.Corrosion product shown in Figure 14
The analysis of accounts figure of film rupture, it is about 430 seconds that wherein straight line inflection point, which corresponds to the time,.
Step 71, by the electrochemical impedance information in the step of receiving oneUsing phase angle D as ordinate, acquisition time section
TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQIt is abscissa, construct rectangular coordinate system；
Step 72, by the sound emission burst information in the step of receiving sixWith event count EV
For ordinate, acquisition time section TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQIt is abscissa, construct rectangular coordinate system；
Step 73, class condition is ruptured by counting slope-phase angle analysis corrosion products film, on the one hand can obtains corruption
It loses Product Films and ruptures Electrochemistry InformationSeparately
On the one hand corrosion products film rupture acoustic emission information can be obtainedIt is overlapped, shows with sampled point if electrode is layouted
There is rupture in this point, it should export early warning information.
In the present invention, slope-phase angle analysis corrosion products film rupture class condition that counts refers to event count-
In time relationship, event count EV- time TAcquisitionTime point of linear relationship when changing that i.e. slope changes, in phase
Angle D- time TAcquisitionIn relationship, corresponding angle values d is maximum phase angle dmax, i.e., in acquisition time section TAcquisition={ t0,t1,
t2,…,tq-1,tq,tq+1,…,tQ,Work as lq≠lq+1,Wherein, the lqIt is tqCorresponding slope, jqIt is tqCorresponding intercept, lq+1It is tq+1Corresponding is oblique
Rate, jq+1It is tq+1Corresponding intercept.
In the present embodiment, due to P2(h2,d2,o2) be unsatisfactory for counting slope-phase angle analysis corrosion products film rupture point
Class condition, P3(h3,d3,o3),…,Pa(ha,da,oa),…,PA(hA,dA,oA) meet counting slope-phase angle analysis corrosion production
Object film ruptures class condition, then has
In the present embodiment, due to S2(E2,AF2,CC2,EV2),S3(E3,AF3,CC3,EV3),S4(E4,AF4,CC4,EV4),
S5(E5,AF5,CC5,EV5),S6(E6,AF6,CC6,EV6),S7(E7,AF7,CC7,EV7), it is unsatisfactory for S8(E8,AF8,CC8,EV8)
It counts slope-phase angle analysis corrosion products film and ruptures class condition, S9(E9,AF9,CC9,EV9),…,Sb(Eb,
AFb,CCb,EVb),…,SB(EB,AFB,CCB,EVB) meet counting slope-phase angle analysis corrosion products film rupture class condition,
Then have
Embodiment 2
Under the application scenarios that oil company provides, petroleum tank is 30 tons of oil reserves.Bottom plate is working electrode, with electrode cloth
Point 2m is that working electrode number is arranged in radius；Using metal block as reference electrode, graphite is auxiliary electrode, the quantity phase of three electrodes
Together, it is connect with cable with electrochemical workstation.
Acoustic radiating instrument carries out data acquisition by arranged for interval of 1.5m on the circumference of petroleum tank base plate external.
Multiple channels of electrochemical workstation output are connected with multiple channels of acoustic emission transducer by data connector
On the serial ports of ground computer.The corrosion products film identification model that embodiment 1 obtains is installed in the memory of computer, is then pressed
Judge subsystem 3 to the electrochemical impedance spectroscopy under acquisition time, sound emission according to petroleum tank connate water insole board corrosion product state
Energy spectrum is analyzed.It has no that corrosion products film germinates through observation in 120 days, occurs through 180 days observation bottom plates less than 2%
Corrosion products film generate, sound emission channel acquisition data do not find slope variation.After 420 days electrochemical workstation channel and
Sound emission channel collects related data, computer output prompt warning information.
The present invention is the system that a kind of pair of petroleum tank bottom plate carries out non-destructive testing corrosion product state, it is to be solved be as
What is lossless and the technical issues of accurately detect and understand the corrosion condition of in-service bottom plate of crude oil tank, and this method passes through to crude oil
Storage tank bottom plate carries out signal acquisition, processing and the multiple analysis of electrochemistry and sound emission, reflects and shows that bottom plate of crude oil tank makes
Stress corrosion situation and damage position in obtain crude oil storage tank to realize in the case where not destroying crude oil storage tank
The stress corrosion of bottom plate and the technical effect for destroying situation.
Claims (4)
1. a kind of nondestructive detection system of petroleum tank bottom plate corrosion product state, it is characterised in that: nondestructive detection system includes
Electrochemical impedance spectroscopy acquisition subsystem (1), sound emission burst information acquisition subsystem (2) and Corrosion of base plate product state judgement
System (3)；
The electrochemical impedance spectroscopy acquisition subsystem (1) is made of electrode group and electrochemical workstation；The electrochemical impedance spectroscopy
Acquisition subsystem (1) acquires impedance spectrum by electrochemical workstation
P1(h1,d1,o1) it is that first electrode is layouted P1Electrochemical impedance information；Wherein, h1It layouts P for first electrode1Spy
Levy frequency, d1It layouts P for first electrode1The h1Corresponding phase angle, o1It layouts P for first electrode1Logarithm impedance it is bent
Intercept of the line in Y-axis；
P2(h2,d2,o2) it is that second electrode is layouted P2Electrochemical impedance information；Wherein, h2It layouts P for second electrode2Spy
Levy frequency, d2It layouts P for second electrode2The h2Corresponding phase angle, o2It layouts P for second electrode2Logarithm impedance it is bent
Intercept of the line in Y-axis；
Pa(ha,da,oa) it is that any one electrode is layouted PaElectrochemical impedance information；Wherein, haIt layouts P for any one electrodea
Characteristic frequency, daIt layouts P for any one electrodeaThe haCorresponding phase angle, oaIt layouts P for any one electrodeaPair
Intercept of the number impedance curve in Y-axis；
PA(hA,dA,oA) it is that the last one electrode is layouted PAElectrochemical impedance information；Wherein, hAIt layouts P for the last one electrodeA
Characteristic frequency, dAIt layouts P for the last one electrodeAThe hACorresponding phase angle, oAIt layouts P for the last one electrodeAPair
Intercept of the number impedance curve in Y-axis；
The sound emission burst information acquisition subsystem (2) is made of Acoustic radiating instrument, preamplifier and acoustic emission transducer；Sound
Transmitter is used to acquire the demblee form information near bottom plate of crude oil tank；Preamplifier is used for each Acoustic radiating instrument
The demblee form information of output carries out 40dB enhanced processing and forms sound emission amplification message；Acoustic emission transducer is for sending out the sound
After penetrating amplification message progress A/D conversion process, acoustic emission energy spectrum is extracted
S1(E1,AF1,CC1,EV1) it is first sampled point S1Digital demblee form information；Wherein, E1For first sampled point S1's
Energy, AF1For first sampled point S1Average frequency, CC1For first sampled point S1Ring-down count, EV1It is adopted for first
Sampling point S1Event count；
S2(E2,AF2,CC2,EV2) it is second sampled point S2Digital demblee form information；Wherein, E2For second sampled point S2's
Energy, AF2For second sampled point S2Average frequency, CC2For second sampled point S2Ring-down count, EV2It is adopted for second
Sampling point S2Event count；
Sb(Eb,AFb,CCb,EVb) it is any one sampled point SbDigital demblee form information；Wherein, EbFor any one sampled point
SbEnergy, AFbFor any one sampled point SbAverage frequency, CCbFor any one sampled point SbRing-down count, EVbFor
Any one sampled point SbEvent count；
SB(EB,AFB,CCB,EVB) it is the last one sampled point SBDigital demblee form information；Wherein, EBFor the last one sampled point
SBEnergy, AFBFor the last one sampled point SBAverage frequency, CCBFor the last one sampled point SBRing-down count, EVBFor
The last one sampled point SBEvent count；
Petroleum tank connate water insole board corrosion product state judges subsystem (3) to electrochemical impedance spectroscopy, the sound under acquisition time
Emitted energy spectrum is analyzed；
Step 1, mutation electrochemical impedance information are chosen；
Step 11, the electrochemical impedance information electrochemical workstation received exportedImpedance spectrum property curve is constructed in impedance processing software；
To obtain TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQUnder maximum frequency hmax, maximum phase angle dmax, maximum impedance
Intercept omax, minimum frequency hmin, minimum phase angle dmin, minimum impedance intercept omin；
t0Time, t are played for the sampling timeQFor the only time in sampling time, t1For first sampling time point, t2It is adopted for second
Sample time point, tqFor any one sampling time point, q is the identification number of sampling time point, tq-1For positioned at tqWhen sampling before
Between point, tq+1For positioned at tqSampling time point later；
Step 12, the electrochemical impedance information electrochemical workstation received exportedWith impedance spectrum class condition | ha-hmax| > α and | da-dmin
|≤β and | oa-omin|≤γ is compared, and obtains electrochemical impedance abrupt informationExecute step 7；
α is the step-length of frequency axis, and β is the step-length of phase angle axis, and γ is the step-length of logarithm impedance axis；
Step 2, burst sound emission number demblee form information are chosen；
The sound emission number demblee form information that will be receivedAccording to cross
Coordinate is acquisition time section TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQ, ordinate is event count EV, constructs right angle
Coordinate system；Whether changed by the slope of a curve to parameter characterization each in rectangular coordinate system, has change to select slope
Change corresponding sampled point, obtains sound emission burst informationExecute step 3；
Step 3, the sound emission divided stages based on slope variation time point；
It is obtained from step 2In select slope
There are the sampled points of variation, obtain the period of the corresponding sound emission burst information slope variation of the sampled point, are denoted as sound hair
Penetrate-slope-period TSound-slope={ t1,t2,…,tn, n ∈ Q；Execute step 4；
Step 4, the crack initiation of the corrosion products film based on absolute energy and the acoustic emission information of rupture obtain；
The sound emission burst information that receiving step two obtainsAnd sound emission-slope-of receiving step three
Period TSound-slope={ t1,t2,…,tn}；It is acquisition time section T according to abscissaAcquisition={ t0,t1,t2,…,tq-1,tq,
tq+1,…,tQ, ordinate is the absolute energy E in sound emission burst information, constructs rectangular coordinate system；
Using absolute energy corrosion products film crack initiation class conditionTo describedIt is handled, obtains corrosion products film crackle and sprout
Raw acoustic emission informationReturn step two；
Class condition is ruptured using absolute energy corrosion products filmAndTo describedIt is handled, obtains corrosion products film rupture sound
Transmitting informationExecute step 5；
It indicates in acquisition time section TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQInterior Acoustic radiating instrument 23 exports
Digital demblee form informationIn average absolute energy, referred to as
Always-average absolute energy；
It indicates in sound emission-slope-period TSound-slope={ t1,t2,…,tnInIn average absolute energy, referred to as time
Section-average absolute energy；
Step 5, the corrosion products film crack initiation acquisition of information based on Ring-down count；
Step 51, the corrosion products film in receiving step four ruptures acoustic emission informationUsing Ring-down count CC as ordinate, with the vibration
The duration DU that bell counts CC is abscissa, constructs rectangular coordinate system；
Ring ratioRefer to the ratio between Ring-down count value CC and duration DU；
Step 52, the ring ratio for calculating each sampled point obtains ring ratio collection
Step 53, willIn each sampled point vibration
Bell ratio is analyzed using ring mean ratio ring corrosion products film crack initiation class condition, is on the one hand obtained corrosion and is produced
Object film crack initiation acoustic emission informationReturn step two；
On the other hand it is obtained simultaneously by using ring mean ratio ring corrosion products film crack initiation and rupture class condition
Acoustic emission information with corrosion products film crack initiation and ruptureExecute step 6；
The ring mean ratio ring corrosion products film crack initiation class condition refers to when preceding half maximum continues
Between value DUmaxIn range, under the identical duration, there are the maximum Ring-down count values of any one sampled pointWhen continuing with this
Between lower averagely Ring-down count CCIt is averageRatio be less than or equal to 2, that is, existWhen
The ring mean ratio ring corrosion products film crack initiation and rupture class condition refer to maximum in preceding half
Duration value DUmaxIn range, under the identical duration, there are the maximum Ring-down count values of any one sampled pointWith
Average Ring-down count CC under the durationIt is averageRatio be greater than 2, that is, existWhen
The acoustic emission information of step 6, corrosion products film crack initiation and rupture based on bispectrum waveform obtains；
The corrosion products film crack initiation of receiving step five and the acoustic emission information of ruptureAnd to normalize bifrequency as ordinate, with frequency
AF is abscissa, constructs rectangular coordinate system；Calculate the quantity FP at peakPeak, on the one hand can be sprouted by bispectrum corrosion products film crackle
Raw class condition judges corrosion products film crack initiation acoustic emission informationReturn step two；
On the other hand class condition can be ruptured by corrosion products film judges that corrosion products film ruptures acoustic emission informationExecute step 7；
AFT acquisitionIt indicates in TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQUnder all average frequency AF injury tolerance frequency；
The bispectrum corrosion products film crack initiation class condition refers to meter when the maximum average frequency of any one sampled point is greater than 0
Calculating is a peak, at this time the FP at the peakPeakQuantity is 1, and in all injury tolerance frequency AFT acquisitionUpper FPPeak≡1；
The bispectrum corrosion products film rupture class condition refers to be calculated as when the maximum average frequency of any one sampled point is greater than 0
One peak, the at this time FP at the peakPeakQuantity is 1, i.e., in all injury tolerance frequency AFT acquisitionUpper FPPeak> 1；
Step 7, the acquisition of information based on the rupture of the corrosion products film of impedance spectrum and event count；
Step 71, by the electrochemical impedance information in the step of receiving oneUsing phase angle d as ordinate, acquisition time section
TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQIt is abscissa, construct rectangular coordinate system；
Step 72, by the sound emission burst information in the step of receiving twoUsing event count EV as ordinate, acquisition time section
TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,tQIt is abscissa, construct rectangular coordinate system；
Step 73, class condition is ruptured by counting slope-phase angle analysis corrosion products film, on the one hand can obtains corrosion and produces
Object film ruptures Electrochemistry Information
On the other hand corrosion products film rupture acoustic emission information can be obtainedIt is overlapped, shows with sampled point if electrode is layouted
There is rupture in this point, it should export early warning information；
The counting slope-phase angle analysis corrosion products film ruptures class condition and refers in event count-time relationship, event
Count EV- time TAcquisitionTime point of linear relationship when changing that i.e. slope changes, in phase angle d- time TAcquisitionRelationship
In, corresponding angle values d is maximum phase angle dmax, i.e., in acquisition time section TAcquisition={ t0,t1,t2,…,tq-1,tq,tq+1,…,
tQ, Work as lq≠lq+1,Wherein, described
lqIt is tqCorresponding slope, jqIt is tqCorresponding intercept, lq+1It is tq+1Corresponding slope, jq+1It is tq+1Corresponding cuts
Away from.
2. a kind of nondestructive detection system of petroleum tank bottom plate corrosion product state according to claim 1, it is characterised in that:
Electrode group is three electrodes, is working electrode, reference electrode and auxiliary electrode respectively；The working electrode is petroleum tank bottom plate.
3. a kind of nondestructive detection system of petroleum tank bottom plate corrosion product state according to claim 1, it is characterised in that:
Electrochemical workstation is connect by a plurality of cable with petroleum tank bottom plate.
4. a kind of nondestructive detection system of petroleum tank bottom plate corrosion product state according to claim 1, it is characterised in that:
Multiple Acoustic radiating instruments are arranged in the outside of petroleum tank bottom plate.
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