碳钢表面低聚倍半硅氧烷复合氟锆酸转化膜的耐蚀性研究  

Investigation of the Corrosion Resistance of Carbon Steel Surface with Oligomeric Silsesquioxane Composite Fluozirconic Acid Conversion Film

作　　者：查豪 姜玉坤 徐重磊 陈均[1] ZHA Hao;JIANG Yukun;XU Chongei;CHEN Jun(School of Chemistry and Chemical Engineering,Anhui University of Technology,Ma’anshan 243000,China)

机构地区：[1]安徽工业大学化学与化工学院,安徽马鞍山243000

出　　处：《材料保护》2024年第12期35-42,共8页Materials Protection

基　　金：国家自然科学基金(U1460106)。

摘　　要：为提高碳钢表面的耐腐蚀性,采用氟锆酸复合氨基/羟基-多面体低聚倍半硅氧烷(NH_(2)/OH-POSS)制备了无磷无铬的氟锆酸复合低聚倍半硅氧烷转化膜。使用盐水浸泡、电化学测试、扫描电镜(SEM)和X射线光电子能谱(XPS)对复合膜的耐蚀性、表面形貌及成分进行了表征。结果表明:氟锆酸溶液复合氨基/羟基-多面体低聚倍半硅氧烷水溶液的最佳工艺为1.2 g/L氟锆酸、4.5 g/L低聚倍半硅氧烷,pH值为4、温度30℃、钝化时间2 min;盐水浸泡试验和电化学测试结果表明,复合转化膜较纯氟锆酸转化膜的防腐性得到明显改善;SEM结果表明,低聚倍半硅氧烷的加入弥补了氟锆酸膜层的裂痕和孔洞的缺陷,使膜层更加致密;XPS结果表明,低聚倍半硅氧烷和氟锆酸共同参与转化膜的形成。For improving the corrosion resistance of carbon steel surfaces,a phosphorus free and chromium free fluorozirconic acid composite oligomeric silsesquioxane conversion film was prepared using fluorozirconic acid composite amino/hydroxyl polyhedral oligomeric silsesquioxane(NH_(2)/OHPOSS).The corrosion resistance,surface morphology and composition of the composite film were characterized by saltwater immersion,electrochemical testing,scanning electron microscopy(SEM)and Xray photoelectron spectroscopy(XPS).Results showed that the optimal process for the fluorozirconate solution combined with the NH_(2)/OHPOSS aqueous solution was 1.2 g/L fluorozirconic acid,4.5 g/L oligomeric silsesquioxane,pH of 4,the temperature of 30℃,the passivation time of 2 min.The saltwater immersion test and electrochemical test indicated that the corrosion resistance of the composite conversion film was significantly improved compared to the pure fluorozirconic acid conversion film.SEM results revealed that the addition of oligomeric silsesquioxane filled the cracks and pores in the fluorozirconate film,making the film denser.XPS results confirmed that both oligomeric silsesquioxane and fluorozirconate participated in the formation of the conversion film.

关 键 词：无磷无铬钝化 氨基/羟基-多面体低聚倍半硅氧烷 (NH_(2)/OH-POSS) 氟锆酸 碳钢板 

分 类 号：TG174.4[金属学及工艺—金属表面处理]