CN1015742B - Measuring method and device of electric chemistry by use of concentration-beam microelectrode corrosion principle - Google Patents
Measuring method and device of electric chemistry by use of concentration-beam microelectrode corrosion principleInfo
- Publication number
- CN1015742B CN1015742B CN 89101808 CN89101808A CN1015742B CN 1015742 B CN1015742 B CN 1015742B CN 89101808 CN89101808 CN 89101808 CN 89101808 A CN89101808 A CN 89101808A CN 1015742 B CN1015742 B CN 1015742B
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- microelectrode
- computing machine
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- distribution
- boundling
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- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The present invention relates to an electrochemical method and a device for measuring the potential distribution and the current distribution on the surface of a corroded sample. A bundling microelectrode is adopted, and simultaneously, measured data is collected at different positions of the bundling microelectrode; therefore, the measuring time is greatly shortened, the computer control and the computer calculation are realized, and users can integrally and clearly know the corroding development transient process of the surface of the corroded sample.
Description
The present invention relates to a kind of electrochemical measuring method and device, be specially adapted to measurement the corrosion sample.
Abroad, the seventies people have developed the single microelectrode scanister that can measure corrosion sample surfaces Potential distribution and distribution of current.At home, the eighties is also made similar device, as patented claim 85101940 and 86103043, their common ground is motion scan on the corrosion sample by one of Mechanical Driven or upper and lower two microelectrodes, and be recorded in the moving process microelectrode at each locational relative potential value, through data processing record value is become width of cloth surface potential (or electric current) distribution plan again.Use mechanically operated method of operating, make microelectrode on whole corrosion sample surfaces, scan the long time of needs one time, but many corrosion processes, such as: local corrosions such as spot corrosion, stress corrosion, all have sudden and contingency, have only careful, record these accidental burst processes exactly, essence that could correct understanding corrosion, thereby, provide foundation the serviceable life of raising material for preventing that corrosion from taking place.This just requires to measure and to write down the Potential distribution and the distribution of current of corroding on the sample surfaces fast, is difficult to finish with former method and apparatus.
The objective of the invention is to change original measuring method and device, adopt the boundling microelectrode, image data on the diverse location of corrosion sample shortens Measuring Time simultaneously, realize computer control and calculating, thus corrosion transient state evolution comprehensive, that be well understood to the corrosion sample surfaces.
This method is according to the size of corrosion sample surfaces, is propped up/cm by 100-400
2Microelectrode is formed hundreds of microelectrode bundle, to the microelectrode image data of diverse location, and sends the acquisition controlling order by computing machine, at last the data that collect is directly imported computing machine and carries out analyzing and processing.Adopt the used measurement mechanism of this method mainly to comprise boundling microelectrode (4), multichannel data acquisition system (2), computing machine (1).The input of acquisition system links to each other with the boundling microelectrode, and output links to each other with computing machine.Describe in detail below in conjunction with three parts of accompanying drawing 1 with regard to its measurement mechanism:
The boundling microelectrode: the polar body of microelectrode is the filamentary silver of φ 0.10-0.15mm, behind outsourcing insulated cladding PVC or the equivalent, constitute electrode material, the electrode material of some closely is arranged in together in certain sequence, bonding one-tenth boundling microelectrode matrix, again with the electrode bundle that glues at plain square cut off ends, electricity consumption polarization method chlorination in 01NNaCl+0.1NHCl solution then.Faradaic current is 10～1000 μ A/400 root electrodes, and the time is 20～30 minutes.During measurement, with the parallel top that is placed on sample of boundling microelectrode, and with sample at a distance of 0.1～0.5mm part.
Data acquisition system (DAS):
Quantity according to the microelectrode bundle, the input end of acquisition system has the passage of microelectrode bundle quantity at least, make each electrode that one stationary conduit all be arranged,, almost do not have load capacity because the electric signal on the boundling microelectrode is very faint, therefore for guaranteeing the accuracy of data acquisition system (DAS), overcome the interference of external noise, between microelectrode and input end, add voltage follow apparatus (3), in order to improve sample rate, in data acquisition system (DAS) inside, can adopt multi-channel A/parallel way of D grouping.The data of gathering are directly imported in the calculator memory by output terminal.
Computing machine: should adapt with used data acquisition system (DAS).Computing machine sends the acquisition controlling order, provides the various parameters of gatherer process by software, sends beginning and interruptive command.And can receive and stored data, cooperate software for calculation, carry out the analyzing and processing of data, obtain the situation of the corrosion process of needs research.
Among Fig. 1, (5) are 220V(AC) stabilized voltage supply, (6) be that 10V3A D.C. regulated power supply, (7) are the microelectrode position control.
Embodiment:
In tap water with the dense spot corrosion sample of putting into simulation to the 1.0N NaCl solution (sample by the Pt silk as anode, with brass as negative electrode, platinum filament diameter phi 0.15mm is placed in the hole of φ 1.0mm on the brass sheet, insulate with binder between platinum filament and the copper coin)
During measurement, with the parallel copper coin-Pt silk top that is placed on of boundling microelectrode, distance C u plate-platinum filament system 0.10～0.50mm is measured and record data, obtains the surface potential distribution plan.
Fig. 2 adopts the present invention in Pt/Cu, 0.1N NaCl system, spread of electrodes sample surfaces 100 μ m, the measurement result that obtains under the electromotive force peak value 34mV condition.
Fig. 3 adopts the present invention in Pt/Cu, 0.1N NaCl system, spread of electrodes sample surfaces 500 μ m, the measurement result that obtains under the electromotive force peak value 5mV condition.
Fig. 4 is the measurement result that obtains with single microelectrode scan method under the same conditions, and by them as seen: (1) Measuring Time is than previous method fast 10
3～10
4Doubly, the quick change procedure of measuring corrosion sample surfaces Potential Distributing is achieved; (2) sensitivity is higher.By Fig. 2,3,4 as seen, this method gained distribution plan electromotive force peakedness ratio is big by 10 by the value that previous method obtains under the same conditions
1～10
2Doubly.
Claims (2)
1, a kind of electrochemical method of measuring corrosion sample surfaces Potential distribution and distribution of current.Relative potential value with on the diverse location of the quick measuring samples of microelectrode surface is characterized in that: by 100～400/cm
2Microelectrode is formed the microelectrode bundle in certain sequence, sends the acquisition controlling order by computing machine, to being positioned at the microelectrode image data of diverse location, at last the data that collect is directly imported computing machine and carries out analyzing and processing.
2, a kind of measurement mechanism that is used to corrode sample surfaces Potential distribution and distribution of current mainly comprises computing machine (1), multichannel collecting system (2), voltage follow apparatus (3) and boundling microelectrode probe (4).Four parts is characterized in that (4) link to each other with the input end of (3), and the output terminal of (3) links to each other with the input end of (2), and the output of (2) links to each other with (1).Be included as computing machine (1) and multichannel collecting system (2) in addition the alternating current steady voltage plug (5) of power is provided, it links to each other with (1), (2); For voltage follower (3) provides the D.C. regulated power supply (6) of power, its links to each other with (3), and (7) three auxiliary equipments of microelectrode probe positions regulator that link to each other with boundling microelectrode probe (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89101808 CN1015742B (en) | 1989-04-01 | 1989-04-01 | Measuring method and device of electric chemistry by use of concentration-beam microelectrode corrosion principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89101808 CN1015742B (en) | 1989-04-01 | 1989-04-01 | Measuring method and device of electric chemistry by use of concentration-beam microelectrode corrosion principle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1046042A CN1046042A (en) | 1990-10-10 |
| CN1015742B true CN1015742B (en) | 1992-03-04 |
Family
ID=4854445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89101808 Expired CN1015742B (en) | 1989-04-01 | 1989-04-01 | Measuring method and device of electric chemistry by use of concentration-beam microelectrode corrosion principle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1015742B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1301929C (en) * | 2003-05-07 | 2007-02-28 | 河海大学 | Composite silt solidified material |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122307B (en) * | 2013-04-27 | 2017-04-19 | 中国科学院金属研究所 | Multichannel potential measuring instrument |
| CN107389753A (en) * | 2015-02-25 | 2017-11-24 | 天津大学 | Cracks of metal surface detection method based on electrochemistry the cannot-harm-detection device |
| CN105319158B (en) * | 2015-02-25 | 2017-11-07 | 天津大学 | The cannot-harm-detection device and method of online prison detection metal welding jointses position galvanic corrosion sensitiveness |
-
1989
- 1989-04-01 CN CN 89101808 patent/CN1015742B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1301929C (en) * | 2003-05-07 | 2007-02-28 | 河海大学 | Composite silt solidified material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1046042A (en) | 1990-10-10 |
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