封孔处理对等离子喷涂Cr₂O₃-8TiO₂涂层耐腐蚀性能的影响

张晶晶, 王泽华, 林萍华, 卢文欢

河海大学材料科学与工程学院



摘要:

为了提高等离子喷涂陶瓷涂层的耐腐蚀性能,扩大其应用范围,以环氧树脂和有机硅树脂为封孔剂对等离子喷涂Cr2O3-8TiO2涂层进行了封孔处理,采用盐雾腐蚀和电化学腐蚀方法对封孔涂层和未封孔涂层的耐腐蚀性能进行研究,使用扫描电镜/能谱仪(SEM/EDS)、光学显微镜(OM)观察了腐蚀前后涂层的形貌及成分变化,分析涂层的腐蚀机理.结果表明,240h盐雾腐蚀后未封孔涂层发生剥落失效,而有机硅树脂封孔涂层经1200h盐雾腐蚀表面仍保持完好.封孔涂层的耐腐蚀性明显优于未封孔涂层,有机硅树脂的封孔效果优于环氧树脂.

关键词:  等离子喷涂  封孔处理  封孔剂  耐腐蚀性能

DOI：10.11951/j.issn.1005-0299.20100523

分类号:TG174.4

基金项目:



Effect of sealing treatment on corrosion resistance of plasma sprayed Cr₂O₃-8TiO₂ coating

ZHANG Jing-jing, WANG Ze-hua, LIN Ping-hua, LU Wen-huan

College of Materials Science & Engineering,Hohai University,Nanjing 210098,China

Abstract:

In order to improve the corrosion resistance of plasma sprayed ceramic coatings,sealing treatment by epoxy resin and silicone resin was used to seal the pores in the coatings.The corrosion performance was evaluated through salt spray test and electrochemical corrosion tests,which were complemented by scanning electron microscopy/energy dispersive spectroscopy(SEM/EDS) and optical microscopy(OM).It was detected that after 240 h salt spray,the unsealed coating flaked off the substrate while the silicone resin sealed coating was survived even after 1200 h salt spray.The silicone resin was more effective than epoxy resin in enhancing the anti-corrosion performance of the coating.Therefore,sealing by silicone resin improve the corrosion resistance of ceramic coatings effectively.

Key words:  plasma spraying  sealing treatment  sealants  corrosion resistance