文献类型：期刊文章

作　　者：郭惠霞[1,2] 马颖[1] 王劲松[1] 王宇顺[1] 董海荣[1] 郝远[1]

机构地区：[1]兰州理工大学有色金属新材料国家重点实验室培育基地,兰州730050 [2]西北师范大学化学化工学院,甘肃省生物电化学与环境分析重点实验室,兰州730070

出　　处：《Transactions of Nonferrous Metals Society of China》

基　　金：Project (2007CB613700) supported by the National Basic Research Program of China;Project supported by Research Program of Excellent Scholars Studying Abroad of Ministry of Human Resources and Social Security,China

年　　份：2012

卷　　号：22

期　　号：7

起止页码：1786-1793

语　　种：中文

收录情况：AJ、CAS、CSA、CSA-PROQEUST、CSCD、CSCD2011_2012、EI、INSPEC、JST、SCI(收录号：WOS:000307819300037)、SCI-EXPANDED(收录号：WOS:000307819300037)、SCIE、SCOPUS、WOS、ZGKJHX、普通刊

摘　　要：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.

关 键 词：micro-arc oxidation coating  AZ91D magnesium alloy  corrosion behavior  chloride ion concentration  electrochemical techniques  

分 类 号：TG172.6]