CN104865183A - Coating bonding strength measurement method - Google Patents
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- CN104865183A CN104865183A CN201510319574.XA CN201510319574A CN104865183A CN 104865183 A CN104865183 A CN 104865183A CN 201510319574 A CN201510319574 A CN 201510319574A CN 104865183 A CN104865183 A CN 104865183A
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Abstract
The invention discloses a coating bonding strength measurement method. The coating bonding strength measurement method comprises the following steps: step 1, impacting a test sample to be measured by using a pressure head, and inducing a coating to lose efficiency; step 2, monitoring a whole impacting process in real time by using a sound emission detector, and acquiring a sound emission signal in the impacting process; and step 3, carrying out analysis treatment on the sound emission signal and judging the bonding strength of the coating according to the strength of the sound emission signal. When the strength of the sound emission signal is higher, the bonding strength of the coating is worse; and when the strength of the sound emission signal is lower, the bonding strength of the coating is better. According to the coating bonding strength measurement method disclosed by the invention, a detection process is efficient and rapid, and field real-time detection can be realized; and the size of the bonding strength of the coating can be quantitatively or semi-quantitatively obtained according to the size of the measured sound emission signal.
Description
Technical field
The present invention relates to anchoring strength of coating field of measuring technique, particularly a kind of anchoring strength of coating measuring method adopting ballistic method to combine with acoustic emission testing technology.
Background technology
Thermal spray is a kind of important technology in modern material process for treating surface, is widely used in the manufacture views such as space flight, weapons, power-equipment, transportation equipment.Current coating performance inspection index mainly customizes according to requirements, as ablation test, and thermal shock resistance test, resistance to wear test, shear test, mixcrohardness test, tension test etc.
Anchoring strength of coating is one of important indicator evaluating coating quality, the method measuring anchoring strength of coating reaches hundreds of, wherein the most frequently used have pulling method, scarification, bending method, shearing method etc., but these methods cut both ways, as pulling method can not measure the coating larger than tackifier self bond strength, scarification is mainly applicable to the coating of thickness at below 7um, and bending method is applicable to measuring the more weak each type coating of bond strength, and shearing method cannot measure thinner coating.In addition, said method all need carry out under specific condition of experiment, cannot realize building-site and detect.
Therefore, need badly at present find a kind of can overcome above-mentioned prior art defect and can have fast, efficiently, new accurately anchoring strength of coating measuring method, building-site can be realized and detect.
Summary of the invention
The present invention has designed and developed a kind of anchoring strength of coating measuring method, solves the defect of existing measuring method poor universality, provides a kind of method measuring any layer bond strength, and has the good advantage of measurement versatility.
A further object of the invention solves the defect that in acoustic emission signal detection process, signal disturbing is large, provide erasure signal interference method, measure the bond strength of coating more accurately.
Technical scheme provided by the invention is:
A kind of anchoring strength of coating measuring method, comprises the steps:
Step one, indenter tip and sample to be tested surface to be close to, the probe of acoustic emission detection instrument is pasted by vacuum couplings agent and sample to be tested intimate surface;
Step 2, the 300mm eminence free-falling directly over pressure head of dropping hammer that 1kg is weighed, impact pressure head, and then make impact of head sample to be tested, induction coating failure, and use acoustic emission detection instrument to carry out Real-Time Monitoring to whole impact process, gather the acoustic emission signal of impact process; Described bottom of dropping hammer is provided with padded coaming with described pressure head top, with drop hammer described in reducing collision pressure head time the noise that produces;
Step 3, collection acoustic emission signal, described acoustic emission signal in time variation relation can be expressed as:
x(t)＝Asin(ω
0t)e
-at，
Wherein A and ω
0represent amplitude and the frequency of Elastic wave respectively, a is decay factor, and t is the time, and e is Euler's numbers;
Described acoustic emission signal is carried out Fourier transform, obtains
Morphology opening and closing and make and break average calculating operation are carried out to amplitude spectrum X (ω), obtain filtered signal X ' (ω), and utilize least square fitting to carry out matching to X ' (ω), finally carry out inverse Fourier transform in conjunction with phase information, obtain the acoustic emission signal after noise reduction.
Step 4, the acoustic emission signal after noise reduction to be analyzed, judge anchoring strength of coating; Acoustic emission signal intensity is higher, and anchoring strength of coating is poorer, and acoustic emission signal intensity is lower, and anchoring strength of coating is better.
Preferably, the pregain of described acoustic emission detection instrument is 40dB, and the threshold value that described acoustic emission detection instrument gathers acoustic emission signal is 55dB.
Preferably, the acoustic emission signal of described acoustic emission detection instrument collection is acoustic emission energy count signal; And energy counting is less than 1000, anchoring strength of coating is fairly good; Energy is counted as 1000 ~ 2500, and anchoring strength of coating is good; Energy is counted as 2500 ~ 6000, and anchoring strength of coating is better; Energy is counted as 6000 ~ 10000, and anchoring strength of coating is poor, and energy counting is greater than 10000, and anchoring strength of coating is very poor.
Preferably, the acoustic emission signal of described acoustic emission detection instrument collection is acoustic emission waveform voltage value signal; And waveform voltage is less than 1V, anchoring strength of coating is fairly good; Waveform voltage is 1 ~ 4V, and anchoring strength of coating is good; Waveform voltage is 4 ~ 8V, and anchoring strength of coating is better; Waveform voltage is 8 ~ 9V, and anchoring strength of coating is poor; Waveform voltage is for being greater than 9V, and anchoring strength of coating is very poor.
Preferably, the acoustic emission signal of described acoustic emission detection instrument collection is acoustic emission amplitude signal.
Preferably, described pressure head pressure head is the one in 90 ° of diamond penetrators, 120 ° of diamond penetrators and 120 ° of hard alloy steel pressure heads.
Preferably, the distance of described probe and indenter tip is 15mm ~ 30mm.
Preferably, drop hammer described in lower surface and described pressure head upper surface is provided with cushion, to reduce impact noise.
The invention has the beneficial effects as follows:
1) testing process is efficient, fast, the scene that can realize is detected in real time.
2) can very according to the size of the acoustic emission signal intensity measured, the quantitative size drawing anchoring strength of coating.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of anchoring strength of coating measuring method of the present invention.
Fig. 2 is the energy counting signal graph of matrix of the present invention.
Fig. 3 is the energy counting signal graph of NiCr metallic coating of the present invention.
Fig. 4 is the energy counting signal graph of 995M metallic coating of the present invention.
Fig. 5 is the energy counting signal graph of NiCrAlY metallic coating of the present invention.
Fig. 6 is the energy counting signal graph of CoCrAlYTa metallic coating of the present invention.
Fig. 7 is Al of the present invention
2o
3there is the energy counting signal graph of end ceramic coat.
Fig. 8 is ZrO of the present invention
2there is the energy counting signal graph of end ceramic coat.
Fig. 9 is Cr of the present invention
2o
3there is the energy counting signal graph of end ceramic coat.
Figure 10 is the energy counting signal graph that AT40 of the present invention has end ceramic coat.
Figure 11 is ZrO of the present invention
2the energy counting signal graph of bottomless ceramic coat.
Figure 12 is Al of the present invention
2o
3the energy counting signal graph of bottomless ceramic coat.
Figure 13 is Cr of the present invention
2o
3the energy counting signal graph of bottomless ceramic coat.
Figure 14 is the energy counting signal graph of the bottomless ceramic coat of AT40 of the present invention.
Figure 15 is the amplitude signal figure of matrix of the present invention.
Figure 16 is the amplitude signal figure of NiCr metallic coating of the present invention.
Figure 17 is the amplitude signal figure of 995M metallic coating of the present invention.
Figure 18 is the amplitude signal figure of NiCrAlY metallic coating of the present invention.
Figure 19 is the amplitude signal figure of CoCrAlYTa metallic coating of the present invention.
Figure 20 is Al of the present invention
2o
3there is the amplitude signal figure of end ceramic coat.
Figure 21 is ZrO of the present invention
2there is the amplitude signal figure of end ceramic coat.
Figure 22 is Cr of the present invention
2o
3there is the amplitude signal figure of end ceramic coat.
Figure 23 is the amplitude signal figure that AT40 of the present invention has end ceramic coat.
Figure 24 is ZrO of the present invention
2the amplitude signal figure of bottomless ceramic coat.
Figure 25 is Al of the present invention
2o
3the amplitude signal figure of bottomless ceramic coat
Figure 26 is Cr of the present invention
2o
3the amplitude signal figure of bottomless ceramic coat.
Figure 27 is the amplitude signal figure of the bottomless ceramic coat of AT40 of the present invention.
Figure 28 is the voltage signal figure of matrix of the present invention.
Figure 29 is the voltage signal figure of NiCr metallic coating of the present invention.
Figure 30 is the voltage signal figure of 995M metallic coating of the present invention.
Figure 31 is the voltage signal figure of NiCrAlY metallic coating of the present invention.
Figure 32 is the voltage signal figure of CoCrAlYTa metallic coating of the present invention.
Figure 33 is Al of the present invention
2o
3there is the voltage signal figure of end ceramic coat.
Figure 34 is ZrO of the present invention
2there is the voltage signal figure of end ceramic coat.
Figure 35 is Cr of the present invention
2o
3there is the voltage signal figure of end ceramic coat.
Figure 36 is the voltage signal figure that AT40 of the present invention has end ceramic coat.
Figure 37 ZrO of the present invention
2the voltage signal figure of bottomless ceramic coat.
Figure 38 is Al of the present invention
2o
3the voltage signal figure of bottomless ceramic coat
Figure 39 is Cr of the present invention
2o
3the voltage signal figure of bottomless ceramic coat.
Figure 40 is the voltage signal figure of the bottomless ceramic coat of AT40 of the present invention.
Figure 41 is the surface topography contrast pattern of coating impression of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, can implement according to this with reference to instructions word to make those skilled in the art.
As shown in Figure 1, the invention provides a kind of anchoring strength of coating measuring method, for measuring the bond strength of coating and matrix, concrete measuring process is following steps respectively:
Step one S110, use impact of head sample to be tested, induction coating failure;
Step 2 S120, use acoustic emission detection instrument carry out Real-Time Monitoring to whole impact process, gather the acoustic emission signal of impact process;
Step 3 S130, analyzing and processing is carried out to acoustic emission signal, according to the intensity of acoustic emission signal, judge anchoring strength of coating.
Wherein, in step one S110, by indenter tip and sample to be tested surface contact, 1000g weight is adopted to impact pressure head from the height of 300mm in free falling mode, and then induction coating failure.Place by Rubber washer under sample to be tested.Indenter tip is 120 ° of cone angles, and material adopts hard alloy steel.Because pressure head is less, need prepare Special pressing head cover by fixing, compact siro spinning technology between pressure head and pressure head overlap, does not allow relative sliding.For avoiding metal strike to produce undesired signal, weight bottom and pressure head cover top are stained with the thick rubber of 8mm.
The coating on the sample to be tested surface used in the present embodiment is formed by high-effect Supersonic Plasma Spraying equipment spraying.The larger coating of three class bond strength differences is prepared respectively: metallic coating, have end ceramic coat and bottomless ceramic coat on No. 45 steel matrix surface of the 80mm × 50mm × 4mm through blasting craft process, wherein metallic coating and ceramic coat choose four kinds of dusty materials respectively, have end ceramic coat with the bottoming of NiCr coating.Coating material is chosen as shown in table 1.
Table 1
Totally 12 samples to be tested of the dissimilar coating of three classes using impact of head to be prepared by said method, induction coating failure.Measure for contrast uses, re-use impact of head and do not have cated matrix.
In step 2 S120, acoustic emission detection instrument is adopted to carry out Real-Time Monitoring to whole impact process, the probe of acoustic emission detection instrument contacts with sample to be tested surface, and uses vacuum couplings agent probe and Shuyang surface energy to be fitted tightly, and probe is about 15mm with the spacing of impact of head point.The pregain 40dB of acoustic emission detection instrument, threshold value is that 55dB and acoustic emission detection instrument only record the signal being greater than 55dB.
After the signal detected acoustic emission detection instrument carries out analyzing and processing, according to the intensity of acoustic emission signal, anchoring strength of coating can be drawn.
Can carry out repeatedly in impact and signals collecting, at the present embodiment, five Secondary Shocks are done continuously to each block sample to be tested, and need to move sample to gather next point after the signal often gathering a point, move in process for avoiding sample and produce undesired signal, need after often having gathered the signal of a point to suspend and gather, treat that sample continues to gather after moving.
Be in embodiment at another, judge in step 3 S130 that the method for anchoring strength of coating is: acoustic emission signal intensity is higher, and anchoring strength of coating is poorer; Acoustic emission signal intensity is lower, and anchoring strength of coating is better.
Be in embodiment at another, the acoustic emission signal of described acoustic emission detection instrument collection is acoustic emission energy count signal.As shown in Figure 2, the energy counting that matrix produces in impact process is between 400 ~ 800, and the energy count signal of the impact of matrix as a normative reference, can compare with the impact signal of coating, can elimination noise jamming signal, extract the signal that coating really ftractures and ruptures.As shown in figs. 3-14, metallic coating, there is the energy count signal of end ceramic coat and bottomless ceramic coat obviously large than matrix, the energy counting of metallic coating is between 1000 ~ 2500, have the energy counting of end ceramic coat between 2000 ~ 6000, the energy counting of bottomless ceramic coat is between 5000 ~ 10000.The acoustic emission signal of three type coatings is the signal of coating cracking and fracture higher than the partial visual of matrix.After obtaining energy count signal, the principle poorer according to the larger anchoring strength of coating of energy count value can judge the quality of anchoring strength of coating, the bond strength of coating can be measured by energy count value.
The energy count signal of ceramic coat is obviously large than metallic coating, and its reason has 2 points, and one is that ceramic coat hardness and fragility are comparatively large, and the energy produced in impact process is larger; Two be ceramic coat in conjunction with poor, in impact process, cracking degree is comparatively large, causes the energy of generation to count larger.
The acoustic emission signal of each group coating in comparison diagram 7-10 and Figure 11-14, each group of coating surface is all ceramic coat, there is identical hardness, but the energy count ratio of bottomless ceramic coat has end ceramic coat large, its reason is that the two bond strength is different, bottomless ceramic coat bond strength is poor, the cracking produced in impact process and rupture more, causes energy to count larger.Respectively organize the acoustic emission signal of coating, known coating and hardness all have impact to the acoustic emission signal produced in impact process, but the impact of anchoring strength of coating on acoustic emission signal accounts for leading role.
Be in embodiment at another, the acoustic emission signal of described acoustic emission detection instrument collection is acoustic emission amplitude signal.As shown in figure 15, the amplitude that matrix produces in impact process is between 70 ~ 90dB, wherein comprise multinomial noise signal, the noise signal that the distortion of the noise signal that the noise signal having heavy impact pressure head to produce, impact of head matrix produce, matrix and cracking produce.The impact signal of matrix as a normative reference, can compare with the impact signal of coating, can elimination noise jamming signal, extracts the signal that coating really ftractures and ruptures.As shown in Figure 16-27, metallic coating, there is the acoustic emission amplitude signal of end ceramic coat and bottomless ceramic coat obviously large than matrix, the amplitude of metallic coating is between 80 ~ 95dB, there is the amplitude of end ceramic coat at about 90 ~ 99dB, the amplitude of bottomless ceramic coat reaches maximum, at about 99dB, the acoustic emission amplitude signal of this three type coating is the signal of coating cracking and fracture higher than the partial visual of matrix.After obtaining energy count signal, the principle poorer according to the larger anchoring strength of coating of amplitude can judge the quality of anchoring strength of coating, the bond strength of coating can be measured with amplitude numerical value.
Be in embodiment at another, the acoustic emission signal of described acoustic emission detection instrument collection is acoustic emission waveform signal.As shown in Figure 28-40, matrix, metallic coating, have the magnitude of voltage of end ceramic coat and bottomless ceramic coat waveform and energy to count and amplitude rule be similar to, all increase along with the reduction of anchoring strength of coating, the magnitude of voltage of matrix waveform is at about 0.4 ~ 0.8V, the magnitude of voltage of metallic coating waveform is at about 1 ~ 3V, have the magnitude of voltage of end ceramic coat waveform at about 4 ~ 8V, the magnitude of voltage of bottomless ceramic coat waveform reaches maximum, at about 9 ~ 9.9V.The reason of its reason also with energy counting and amplitude is identical, due to matrix, metallic coating, the bond strength of end ceramic coat and bottomless ceramic coat is had to reduce successively, increase successively in the degree of impact process floating coat cracking and fracture, so the energy that produces increases successively in cracking and fracture process.In addition, the magnitude of voltage change of acoustic emission waveform is floated comparatively greatly, and difference is comparatively obvious, is more suitable for the sign for anchoring strength of coating.
The bond strength of common coating is generally: metallic coating bond strength is 40 ~ 70Mp, end ceramic coat bond strength is had to be 25 ~ 40Mp, bottomless ceramic coat bond strength is less than 25Mp, and acoustic emission signal intensity and this layer standard collected values of bond strength of testing the often kind of coating recorded are as shown in table 1.
Table 1
| Types of coatings | Energy counts | Amplitude (dB) | Voltage (V) | Bond strength (Mp) |
| Matrix | 671 | 73 | 0.7 | 500 |
| 995M metal | 1183 | 81 | 1.12 | 68 |
| NiCr metal | 1339 | 83 | 1.42 | 63 |
| NiCrAlY metal | 1584 | 91 | 1.66 | 55 |
| CoCrAlYTa metal | 1764 | 85 | 2.1 | 51 |
| Al2O3 has the end | 2728 | 94 | 5.06 | 47 |
| ZrO has the end | 3258 | 96 | 6.56 | 42 |
| Cr2O3 has the end | 3825 | 95 | 5.92 | 36 |
| AT40 has the end | 4032 | 99 | 7.2 | 31 |
| ZrO is bottomless | 6420 | 99 | 10 | 25 |
| Al2O3 is bottomless | 6885 | 99 | 9.74 | 20 |
| Cr2O3 is bottomless | 8802 | 99 | 9.82 | 18 |
| AT40 is bottomless | 9744 | 99 | 10 | 13 |
As shown in Table 1, no matter be energy count signal, amplitude signal or voltage value signal, be signal intensity larger, bond strength is poorer, has therefore confirmed the reliability of criterion again.
Be in embodiment at another, described anchoring strength of coating measuring method also comprises and uses optical microscope to observe impression surface, and compares with anchoring strength of coating standard pattern, judges anchoring strength of coating.Use observation by light microscope by the surface topography of the metallic coating impression after impact of head, can draw by observing, the vickers indentation of different metal coating is comparatively similar, impression inside is comparatively fuzzy, and edge is comparatively coarse, compared with matrix vickers indentation, metallic coating impression size is less.Its reason is that this experiment adopts metallic coating to be all nickel chromium triangle type coating, and composition is close, performance is similar, therefore coating morphology is similar, and vickers indentation is also similar.Because metallic coating hardness ratio matrix is large, pressure head press-in is more shallow, therefore makes impression size less, and because pressure head press-in is more shallow, the impression internal color seen under an optical microscope is more shallow and fuzzy; Metallic coating bond strength is not as good as pure substrate combinating strength, and to be subject to percussive pressure fashionable, the existing plastic yield of coating, has again local irregularities to ftracture, and causes indentation edge comparatively coarse.
Observing has the surface topography of end ceramic coat impression to draw, there is end ceramic coat impression size little compared with metallic coating, coating indentation edge all has cracking or peeling phenomenon, its reason is that the hardness ratio matrix of ceramic coat and metallic coating are large, and pressure head press-in is more shallow, therefore makes impression size less, compared with matrix and metallic coating, have end ceramic coat in conjunction with poor, so when being subject to impacting, there is Local Cracking or peeling phenomenon in indentation edge.
The surface topography observing bottomless ceramic coat impression can draw, bottomless ceramic coat indentation edge is protruding and peeling phenomenon is comparatively serious, analyzes its reason, ceramic coat hardness and fragility larger, if be directly combined with matrix without transition bed, its bond strength is very poor, to be subject to percussive pressure fashionable, can produce cracking between coating and matrix, also fracture can be produced between coating, the two combination can cause disbonding, and according to the difference of anchoring strength of coating, the degree of peeling off of coating also can be different.
As shown in figure 41, the surface topography of above-mentioned coating impression and contrast pattern are compared, roughly can draw the bond strength of coating.Its principle is that bond strength quality standard in coating failure mode and figure is compared to evaluate the quality of anchoring strength of coating.In Figure 41, HF-1 ~ HF-4 represents that anchoring strength of coating is better, and HF-5 ~ HF-6 represents that anchoring strength of coating is poor.Comparison of reaching the same goal is known, matrix vickers indentation is similar to HF-1, metallic coating vickers indentation is similar to HF-2, there is end ceramic coat vickers indentation similar to HF-3 and HF-4, triplicity intensity is all better, its bond strength is descending to be followed successively by matrix, metallic coating and to have end ceramic coat, and bottomless ceramic coat vickers indentation is similar to HF-5 and HF-6, and its bond strength is poor.
Although embodiment of the present invention are open as above, but it is not restricted to listed in instructions and embodiment utilization, it can be applied to various applicable the field of the invention completely, for those skilled in the art, can easily realize other amendment, therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend described.
Claims (8)
1. an anchoring strength of coating measuring method, is characterized in that, comprises the steps:
Step one, indenter tip and sample to be tested surface to be close to, the probe of acoustic emission detection instrument is pasted by vacuum couplings agent and sample to be tested intimate surface;
Step 2, the 300mm eminence free-falling directly over pressure head of dropping hammer that 1kg is weighed, impact pressure head, and then make impact of head sample to be tested, induction coating failure, and use acoustic emission detection instrument to carry out Real-Time Monitoring to whole impact process, gather the acoustic emission signal of impact process; Described bottom of dropping hammer is provided with padded coaming with described pressure head top, with drop hammer described in reducing collision pressure head time the noise that produces;
Step 3, collection acoustic emission signal, described acoustic emission signal in time variation relation can be expressed as:
x(t)＝A sin(ω
0t)e
-at，
Wherein A and ω
0represent amplitude and the frequency of Elastic wave respectively, a is decay factor, and t is the time, and e is Euler's numbers;
Described acoustic emission signal is carried out Fourier transform, obtains
Morphology opening and closing and make and break average calculating operation are carried out to amplitude spectrum X (ω), obtain filtered signal X ' (ω), and utilize least square fitting to carry out matching to X ' (ω), finally carry out inverse Fourier transform in conjunction with phase information, obtain the acoustic emission signal after noise reduction.
Step 4, the acoustic emission signal after noise reduction to be analyzed, judge anchoring strength of coating; Acoustic emission signal intensity is higher, and anchoring strength of coating is poorer, and acoustic emission signal intensity is lower, and anchoring strength of coating is better.
2. anchoring strength of coating measuring method according to claim 1, is characterized in that, the pregain of described acoustic emission detection instrument is 40dB, and the threshold value that described acoustic emission detection instrument gathers acoustic emission signal is 55dB.
3. anchoring strength of coating measuring method according to claim 2, is characterized in that, the acoustic emission signal of described acoustic emission detection instrument collection is acoustic emission energy count signal; And energy counting is less than 1000, anchoring strength of coating is fairly good; Energy is counted as 1000 ~ 2500, and anchoring strength of coating is good; Energy is counted as 2500 ~ 6000, and anchoring strength of coating is better; Energy is counted as 6000 ~ 10000, and anchoring strength of coating is poor, and energy counting is greater than 10000, and anchoring strength of coating is very poor.
4. anchoring strength of coating measuring method according to claim 2, is characterized in that, the acoustic emission signal of described acoustic emission detection instrument collection is acoustic emission waveform voltage value signal; And waveform voltage is less than 1V, anchoring strength of coating is fairly good; Waveform voltage is 1 ~ 4V, and anchoring strength of coating is good; Waveform voltage is 4 ~ 8V, and anchoring strength of coating is better; Waveform voltage is 8 ~ 9V, and anchoring strength of coating is poor; Waveform voltage is for being greater than 9V, and anchoring strength of coating is very poor.
5. anchoring strength of coating measuring method according to claim 2, is characterized in that, the acoustic emission signal of described acoustic emission detection instrument collection is acoustic emission amplitude signal.
6. the anchoring strength of coating measuring method according to claim 3 or 4 or 5, is characterized in that, described pressure head pressure head is the one in 90 ° of diamond penetrators, 120 ° of diamond penetrators and 120 ° of hard alloy steel pressure heads.
7. anchoring strength of coating measuring method according to claim 6, is characterized in that, the distance of described probe and indenter tip is 15mm ~ 30mm.
8. anchoring strength of coating measuring method according to claim 7, is characterized in that, described in drop hammer lower surface and described pressure head upper surface be provided with cushion, to reduce impact noise.
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| CN106813995A (en) * | 2017-01-19 | 2017-06-09 | 西南交通大学 | A kind of coating failure detection method and its experimental provision based on impact energy response |
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| CN107167422A (en) * | 2017-03-27 | 2017-09-15 | 首钢京唐钢铁联合有限责任公司 | Method for detecting adhesion of zinc layer of automobile sheet |
| CN107505260A (en) * | 2017-09-12 | 2017-12-22 | 沈阳来金汽车零部件有限公司 | Galvanized steel plain sheet zinc coat adheres to force checking device and detection method |
| CN107505260B (en) * | 2017-09-12 | 2019-07-23 | 沈阳来金汽车零部件有限公司 | Galvanized steel plain sheet zinc coat adheres to force checking device and detection method |
| CN110907354A (en) * | 2019-12-26 | 2020-03-24 | 广东省新材料研究所 | Coating bonding strength testing equipment and method |
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