AZ91D镁合金微弧氧化膜在不同浓度NaCl溶液中的腐蚀行为（英文）

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Bibliographic Details
Published in中国有色金属学报：英文版 Vol. 22; no. 7; pp. 1786 - 1793
Main Author 郭惠霞 马颖 王劲松 王宇顺 董海荣 郝远
Format Journal Article
LanguageEnglish
Published 2012
Subjects
微弧氧化膜AZ91D镁合金腐蚀行为氯离子浓度电化学技术
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ISSN1003-6326

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Bibliography:micro-arc oxidation coating;AZ91D magnesium alloy;corrosion behavior;chloride ion concentration;electrochemical techniques
43-1239/TG
GUO Hui-xia1,2,MA Ying1,WANG Jing-song1,W ANG Yu-shun1,DONG Hai-rong1,HAO Yuan1 1.State Key Laboratory of Gansu Advanced Nonferrous Metal Materials,Lanzhou University of Technology,Lanzhou 730050,China;2.Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province,College of Chemistry and Chemical Engineering,Northwest Normal University,Lanzhou 730070,China
Ceramic oxide coatings were prepared on AZ91D magnesium alloys in alkaline silicate solution using micro-arc oxidation（MAO） technique.The corrosion behavior of MAO coating on AZ91D magnesium alloys in NaCl solutions with different concentrations（0.1%,0.5%,1.0%,3.5% and 5.0% in mass fraction） was evaluated by electrochemical measurements and immersion tests.The results showed that the corrosion rate of the MAO coated AZ91D increased with increasing chloride ion concentration.The main form of corrosion failure was localized corrosion for the MAO coated AZ91D immersed in higher concentration NaCl solutions（1.0%,3.5% and 5.0%）,while it was general corrosion in dilute NaCl solutions（0.1% and 0.5%）.Two different stages of the failure process of the MAO coated AZ91D could be identified：1） occurrence of the metastable pits and 2） growth of the pits.Different equivalent circuits were also proposed based on the results of electrochemical impedance spectroscopy（EIS） for the MAO coated AZ91D immersed in different concentrations of NaCl solutions for 120 h.
ISSN:1003-6326