Role of CO_2 in the initial stage of atmospheric corrosion of AZ91 magne-sium alloy in the presence of NaCl

作     者：LIN Cui LI Xiaogang 

作者机构：Department of Material Science and Technology Nanchang Institute of Aeronautical Technology Nanchang 330034 China Corrosion and Protection Center University of Science and Technology Beijing Beijing 100083 China State Key Laboratory for Corrosion and Protection Institute of Metal Research The Chinese Academy of Sciences Shenyang 110016 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2006年第25卷第2期

页      面：190-196页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：This work was financially supported by the Major State Basic Research Development Program of China (973 Program No. 19990650) and the Materials Science and Engineering Research Center Project of Jiangxi Province of China (No. ZX200401015) 

主　　题：materials science atmospheric corrosion initial stage AZ91 magnesium alloy inhibition 

摘      要：The effect of CO2 and NaCl on the initial stage of atmospheric corrosion of AZ91 magnesium alloy was studied. The observation of surface morphology by optical microscopy （OM）, scanning electron microscopy （SEM） and the analysis of corrosion products by X-ray diffraction （XRD） were integrated to investigate corrosion evolution. The results showed that NaCl stimulated the corrosion by promoting the formation of thin electrolyte film, increasing the conductivity and breaking the protective film in the absence of CO2. The morphology of the corroded samples with deposited NaCl was more homogenous in the presence of CO2. It was suggested that NaCl-induced corrosion was inhibited in the presence of CO2 by the formation of slightly soluble corrosion products containing hydroxy carbonates and hydroxy chlorides that provided a partly protective layer on the surface of the magnesium alloy.