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| Effect of Temperature and Cyclic Thermal Shock on Corrosion Resistance of Polyimide Coatings |
| Received:December 19, 2017 Revised:April 15, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.04.016 |
| KeyWord:polyimide coating high temperature immersion thermal shock EIS |
| Author | Institution |
| TIAN Zhi-wen |
a. School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu , China |
| WANG Ying-ying |
a. School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu , China |
| WANG Hu |
b. School of Materials Science and Engineering, Southwest Petroleum University, Chengdu , China |
| OU Tian-xiong |
Puguang Branch of China Petroleum and Chemical Corporation, Dazhou , China |
| LU Yi-xiong |
Zigong Giant Optical Hard Facing Materials, Sichuan, Zigong , China |
| TANG Jun-lei |
a. School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu , China |
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| Abstract: |
| Objective To study the corrosion resistance and thermal shock resistance performance of polyimide coating on N80 steel. Methods A polyimide anticorrosive coating was obtained on the surface of N80 steel by electrostatic powder spraying technique. The corrosion resistance of PI coating was evaluated by immersion test in different corrosive media at different temperature. The thermal shock resistance of PI coating was studied by cyclic thermal shock test. The surface morphology of PI coating was observed by scanning electron microscopy (SEM). Results TGA showed that the thermal decomposition temperature (Td5) of the PI coating was 518 ℃. The results of electrochemical impedance spectroscopy and SEM observations showed that the higher the corrosion medium temperature was, the faster the corrosion resistance decreased. The corrosion resistance of the coating in 3.5% NaCl solution was better than that in 25% HCl solution. After cyclic thermal shock at different temperatures, the coating surface was intact. Conclusion Polyimide coating has excellent thermal shock resistance. Temperature and electrolyte have a significant impact on the corrosion resistance of PI coating. |
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