常温下添加剂对有色Ti-Zr转化膜形貌与性能的影响  

Influence of Additives on Morphology and Performance of Colored Ti-Zr Conversion Coating at Room Temperature

作　　者：左茜[1] 李文芳[1] 穆松林[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2014年第10期7-13,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：广东省重大科技专项(产业共性技术)(2009A08025002)

摘　　要：为揭示有机物、钒盐两种添加剂对Ti-Zr转化膜膜层生长与耐蚀性能的影响,通过涡流测厚仪、扫描电子显微镜、X射线能谱仪、点滴腐蚀法等研究了转化膜的厚度、微观形貌、化学成分及耐蚀性能等.结果表明:同时添加钒盐和有机物,在30 s内即可获得有色的Ti-Zr转化膜,该膜层致密、均匀,表面平整,膜层中氧化物含量明显增加,且相较于无添加剂的Ti-Zr转化膜,膜厚增加了4倍以上,耐点滴腐蚀时间延长了3倍多,腐蚀电流密度降低至原来的1/6、极化电阻提高了3倍以上,耐蚀性能得到显著提高.In order to reveal the influences of organic compounds and vanadate as additives on the growth and corro- sion resistance of Ti-Zr conversion coating, this paper analyzes the thickness, micro-morphology, chemical constitu- ents and corrosion resistance of the coating by using an eddy current thickness meter, a SEM, a X-ray EDS and by a dropping corrosion test. The results indicate that adding vanadate and organic compounds simultaneously causes a colored Ti-Zr conversion coating to form in 30 s, and the coating is compact, uniform, smooth and contains more ox- ide. In addition, as compared with the coating without any additives, the coating with compounds and vanadate as additives simultaneously achieves the thickness, anti-corrosion time and impedance increases by more than 4, 3, and 3 times respectively, and a corrosion current density decrease by 5/6, which indicates that the corrosion resist- ance is significantly improved.

关 键 词：铝合金 Ti-Zr转化膜 添加剂 耐蚀性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]