Preparation and characterization of yttrium-based chemical conversion coating for magnesium alloys

被引：0

作者：

Li, Lingli ^{[1
]}

Yang, Yuyun ^{[2
]}

Zhao, Gang ^{[1
]}

Cui, Xiufang ^{[2
]}

机构：

[1] School of Mechanical and Electrical Engineering, Harbin Engineering University

[2] College of Material and Chemical Engineering, Harbin Engineering University

来源：

Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2012年 / 33卷 / 12期

关键词：

Conversion coating; Corrosion resistance; Electrochemical analysis and detecting; Magnesium alloys; Microstructure; Yttrium;

D O I：

10.3969/j.issn.1006-7043.201205081

中图分类号：

学科分类号：

摘要：

In an effort to expand the application scope of rare earth mineral and at the same time enrich the categories of rare earth chemical conversion coating, a new preparation called yttrium based chemical conversion coating for magnesium alloys study is proposed. The micromorphology, elemental chemical states and corrosion resistance were observed by the surface analysis technologies of SEM, XPS and EDS combined with the electrochemical analysis and testing technology, respectively. The literature review reveals a preliminary study on the new procedure for conversion coating formation mechanism has been done previously. The research results indicate the yttrium-based conversion coating with uniformly distributed micro cracks has formed on the surface of magnesium alloys successfully. The EDS and XPS results reveal, the coating is primarily made of MgO, Y2O3, YOX/Y and a small amount of Al2O3. During the observation of the coating and substrate interface regions, the results suggest, the main two components of the coating had a content increment of element Y and a content decrement of element Mg. The result from the electrochemical analysis and testing proves that yttrium-based conversion coating is a new type of rare earth chemical conversion coating, worthy of developing and studying more intensely, as it can effectively improve the corrosion resistance of magnesium alloys.

引用

页码：1553 / 1558

页数：5

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