The formation of neodymium conversion coating and the influence of post-treatment

被引：29

作者：

Cui, Xiufang ^{[1
]}

Jin, Guo ^{[2
]}

Yang, Yuyun ^{[2
]}

Liu, Erbao ^{[2
]}

Lin, Lili ^{[2
]}

Zhong, Jinggao ^{[2
]}

机构：

[1] Harbin Engn Univ, Sch Mat Sci & Chem Engn, Harbin 150001, Peoples R China

[2] Harbin Engn Univ, Ctr Biomed Mat & Engn, Sch Mat Sci & Chem Engn, Harbin 150001, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2012年 / 258卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Neodymium conversion coating; Formation; Post-treatment; Corrosion; CHROMIUM PICOLINATE; MAGNESIUM ALLOY; CORROSION; CERIUM; CARCINOGENICITY; TOXICITY; 2024-T3; GROWTH;

D O I：

10.1016/j.apsusc.2011.11.073

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this paper, neodymium-based conversion coating is used as a substitute for toxic chromate conversion coating on AZ91D magnesium alloys. Its formation and growth were observed via SEM, EDS, XPS, electrochemical tests and weighting experiment. The influence of post-treatment on neodymium conversion coating was measured by FTIR and electrochemical experiments in terms of morphology, component, surface functional group and corrosion resistance. The dissolution of matrix and the deposition of neodymium/magnesium oxides compete with each other in initial time. Then the deposition of neodymium oxides dominates the process. Compact coating is obtained after 20 min immersion and it is mainly made of neodymium oxides and a small amount of magnesium oxides/hydroxides. The coating post-treated is rich in OH- and PO43+. The post-treatment can improve the corrosion resistance of the neodymium conversion coating effectually examined by EIS. (C) 2011 Published by Elsevier B.V.

引用

页码：3249 / 3254

页数：6

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