Study of the in situ growth mechanism of Mg-Al hydrotalcite conversion film on AZ31 magnesium alloy

被引：148
|
作者：
Chen, Jun [1 ]
Song, Yingwei [1 ]
Shan, Dayong [1 ]
Han, En-Hou [1 ]
机构：
[1] Chinese Acad Sci, State Key Lab Corros & Protect, Inst Met Res, Shenyang 110016, Peoples R China
来源：
CORROSION SCIENCE | 2012年 / 63卷
基金：
中国国家自然科学基金; 对外科技合作项目（国际科技项目）;
关键词：
Magnesium; XPS; XRD; SEM; Passive films; LAYERED DOUBLE HYDROXIDES; CORROSION-RESISTANCE; CRYSTALLIZATION; COATINGS;
D O I：
10.1016/j.corsci.2012.05.022
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
By means of X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), open circuit potential (OCP) measurement and scanning electronic microscope (SEM), the in situ growth mechanism of the Mg-Al hydrotalcite film has been proposed. The composition and morphology of the films undergo a series of variations during the growth processes. The added Al compounds are a vital contribution to the formation of hydrotalcite. The film formation involves the dissolution of the AZ31 substrate, adsorption of the ions from solution, nucleation of the precursor, followed by the dissolution of Al3+, exchanging of OH- by CO32- and growth of the hydrotalcite film. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：148 / 158
页数：11
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