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| Research on the Effect of Local Minor Damage of Vehicle Equipment Coating on Protection Performance |
| Received:July 28, 2020 Revised:August 31, 2020 |
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| DOI：10.7643/issn.1672-9242.2021.02.013 |
| KeyWord:damaged coating military green organic coating corrosion EIS |
| Author | Institution |
| XU An-tao |
Military Vehicle Engineering Department,Tianjin , China |
| ZHOU Hui |
Military Vehicle Engineering Department,Tianjin , China |
| FENG Hui-juan |
Military Vehicle Engineering Department,Tianjin , China |
| WEI Jun-yi |
Postgraduate Training Brigade, Fifth Team of Cadets, Army Military Transportation University, Tianjin , China |
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| Abstract: |
| Toexplore the changes in the performance of organic coatings on military vehicles after minor breakage and indirectly predict the service life of micro-damaged coatings through the comparative analysis of the protective ability of intact coatings, this paper uses a certain type of active equipment coating as a test sample to carry out the cyclic accelerated corrosion test under the integrated environment. Finally, EIS is used to analyze the experimental data on the difference of the protective performance. As a result, both the protective properties of the intact coating and the damaged coating show a significant drop. Both of them lose their protective ability after 10 cycles of corrosion test, and a large area of rust appears. The low-frequency impedance modulus |Z|0.1 Hz of the intact coating is in the order of 1010 Ω.cm2 at the beginning of the test and finally falls below 106 Ω.cm2. The low-frequency impedance modulus of the damaged coating |Z|0.1 Hz is 1.2×105 Ω.cm2 for the initial state, and after the 9 corroding cycles to 5.7×103 Ω.cm2, it is decreased by 2 orders of magnitude. Damaged coating exhibits more capacitive properties at the beginning of the corrosion. Its initial protective effect is approximately equivalent to the 6~7th cycle test of the intact coating. The damaged part exhibits the periodic variation of “passivation-dissolution-repassivation-redissolution”. |
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