表面技术Issue(5)：38-42,5.DOI:10.16490/j.cnki.issn.1001-3660.2015.05.007
5052铝合金表面钛锆基转化膜的制备及耐蚀性
Preparation and Corrosion Resistance of Ti-Zr-based Conversion Coating on 5052 Aluminum Alloy
张贺宏 1张晓丰 2赵旭辉 1唐聿明 2左禹1
作者信息
- 1. 材料电化学过程与技术北京市重点实验室，北京100029
- 2. 北京化工大学 材料科学与工程学院，北京100029
- 折叠
摘要
Abstract
Objective To study the preparation process of the chromate-free conversion treatment on aluminum alloys. Methods The chemical conversion coating was prepared with K2 ZrF6 and K2 TiF6 as the main salt, KMnO4 as the oxidant and NaF as the ac-celerant. The surface morphology, structure and composition were analyzed by SEM, EDS, FT-IR, and XPS. The corrosion resist-ance of conversion coating was studied by copper sulfate dropping, salt water immersion and polarization curve. Results The pre-pared yellow conversion coating mainly consisted of AlF3 ·3H2 O, AlOx/Al, Al2 O3 , MnO2 , and TiO2 . The corrosion potential of the Al alloy sample was positively shifted about 591 mV and the corrosion current density was dropped from 1. 10 μA/cm2 to 0. 48μA/cm2 after conversion treatment. After sealing treatment, the corrosion current density further decreased to 0. 04 μA/cm2 and the corrosion resistance was significantly improved. Conclusion The conversion coating, which was prepared with K2 ZrF6 and K2 TiF6 as the main salt, had good corrosion resistance.关键词
铝合金/转化膜/封闭处理/耐蚀性Key words
aluminum alloy/conversion coating/sealing treatment/corrosion resistance分类
化学化工引用本文复制引用
张贺宏,张晓丰,赵旭辉,唐聿明,左禹..5052铝合金表面钛锆基转化膜的制备及耐蚀性[J].表面技术,2015,(5):38-42,5.
