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| Comparative Corrosion Resistance Analysis and Application of High Temperature Coatings on Exhaust Pipes of Engines |
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| DOI：10.7643/issn.1672-9242.2023.06.011 |
| KeyWord:high temperature coating exhaust pipe corrosion resistance high temperature resistance application |
| Author | Institution |
| GUO Qiang |
Beijing Institute of Machinery and Equipment, Beijing , China |
| LI Hai-feng |
Beijing Institute of Machinery and Equipment, Beijing , China |
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| Abstract: |
| The work aims to conduct comparative corrosion resistance analysis and application of four high temperature coatings to overcome the difficulty in corrosion resistance of exhaust pipes for engines in a marine atmospheric environment. The high temperature test, outdoor exposure test of sample pieces and physical verification of exhaust pipes were employed to test and analyze high temperature resistance, corrosion resistance and application effect of 3 modified silicone coatings and one inorganic coating. The high temperature test and outdoor exposure test results of coated sample pieces indicated that the high temperature resistance at 600 ℃ and corrosion resistance of 3 silicone coatings were better than those of the inorganic coating, respectively. But the outdoor exposure test of the coated sample pieces after high temperature test at 600 ℃ showed that the corrosion resistance of the carbon doped silicone coating was better than that of the other three coatings, and that of the inorganic coating was better than that of the other two organic coatings. The coated exhaust pipe application test exhibited that the carbon doped silicone coating corroded fast under frequent alternating action of high temperature oxidation, precipitation cooling, and corrosion at normal temperature. The silicone fluororesin coating showed the best corrosion prevention properties. The epoxy modified silicone coating corroded obviously in the high temperature zone. The Zinc powder in the inorganic phosphate Zn-rich coating and the cast iron matrix corroded evidently. The four high temperature coatings on the exhaust pipe show remarkably better corrosion resistance than the traditional silver powder coating. In view of the above test conditions, the four high temperature coating show different advantage and disadvantage of high temperature resistance and corrosion resistance, which have to be modified in many ways according to their own shortcomings. Under actual working conditions, the silicone fluororesin coating meets the requirements of continual service with non-maintenance for at least 1 year in a marine atmospheric environment; while the other two silicone coatings and the inorganic phosphate coating need to be fixed partly. |
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