AZ91D镁合金表面环保型钙系磷化膜的制备及其耐蚀性

王鹏飞, 隆佳, 孙瑞雪*

(青岛科技大学 材料科学与工程学院，山东 青岛 266042)

摘要： 采用化学转化处理的方法，在AZ91D镁合金的表面制备了均匀致密的钙系磷化膜，其中磷化液配方中不含铬、氟及亚硝酸盐等对环境有害的离子。通过场发射扫描电子显微镜和X射线衍射仪研究了磷化时间及温度对磷化膜结构和相组成的影响。结果表明：磷化时间为20 min，磷化温度为40 ℃时，所得到的磷化膜的致密性和均匀性较好。与空白基体相比，经磷化处理后的镁合金在35%NaCl溶液中的耐腐蚀性能明显提高。

关键词： 镁合金; 钙系磷化膜; 耐蚀性; 电化学测试

 中图分类号： TG 174.42      文献标志码： A

Preparation and Corrosion Resistance of an Environmentfriendly Phosphate Conversion Coating on AZ91D Alloy

WANG Pengfei, LONG Jia, SUN Ruixue

 (College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

Abstract: An environmentfriendly phosphate conversion coating free of chromate, fluorides, and nitrite was developed on AZ91D alloy through a facile chemical deposition method. Influence of phosphating time and temperature on the morphology and phase composition of magnesium alloy was investigated by field emission scanning electron microscopy and Xray diffraction (XRD). The results indicated that when the phosphating time was 20 min and temperature was 40 ℃, the phosphate coating was dense and uniform. Compared with the bare AZ91D substrate, the corrosion resistance of the phosphate coating was improved greatly in 35% NaCl solution.

Key words: magnesium alloy； calcium phosphate coating； corrosion resistance； electrochemical test

收稿日期： 20130923

基金项目： 山东省优秀中青年科学家科研奖励基金项目（BS2010CL018）.

作者简介： 王鹏飞(1988—)，男，硕士研究生.      *通信联系人.