底盘发动机排烟管高温涂料耐腐蚀性能对比分析与应用  

Comparative Corrosion Resistance Analysis and Application of High Temperature Coatings on Exhaust Pipes of Engines

作　　者：郭强 李海峰 GUO Qiang;LI Hai-feng(Beijing Institute of Machinery and Equipment,Beijing 100854,China)

机构地区：[1]北京机械设备研究所,北京100854

出　　处：《装备环境工程》2023年第6期83-91,共9页Equipment Environmental Engineering

摘　　要：目的针对底盘发动机排烟管在某海洋大气环境中腐蚀防护难度大的问题,对4种高温涂料进行耐腐蚀性能对比分析与应用。方法分别采用试片高温试验、户外暴露试验和排烟管实装实地验证等方法对3种改性有机硅、1种无机硅酸盐共4种高温涂层的耐高温、耐腐蚀性能及应用效果进行测试与分析。结果高温涂层试片的高温试验、户外暴露试验结果表明,3种改性有机硅涂层600℃的耐高温性能、耐腐蚀性能优于无机硅酸盐涂层,但试片经600℃高温烧蚀后进行户外暴露试验的结果表明,石墨掺杂有机硅涂层耐蚀性优于其余3种涂层,无机硅酸盐涂层优于氟树脂改性有机硅、环氧改性有机硅涂层。排烟管实装实地验证试验则表明,石墨掺杂有机硅涂层受到高温氧化、降水冷却、常温腐蚀等频繁交替作用下,腐蚀较快,氟树脂改性有机硅涂层的防护性较好,环氧改性有机硅涂层在高温区域腐蚀明显,无机硅酸盐涂层中锌粉和铸铁基体存在明显腐蚀。结论相对于传统的银粉漆,4种高温涂层显著改善了排烟管的腐蚀防护性能。在上述4种试验条件下,4种高温涂层的耐高温、耐腐蚀等性能各有优劣,需要根据4种涂层各自的性能不足进行改进。在实际工况条件下,氟树脂改性有机硅耐涂层满足发动机排烟管在某海洋大气环境中不低于1 a免维护的使用要求,其他2种有机硅涂层、1种无机硅酸盐涂层则需要一定程度维护。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 inor-ganic 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 cool-ing,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 re-markably 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 ser

关 键 词：高温涂料 排烟管 耐腐蚀 耐高温 

分 类 号：TG172[金属学及工艺—金属表面处理]