Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第23卷    第2期    总第167期    2013年2月

[PDF全文下载]        

    

文章编号:1004-0609(2013)02-0403-07
固溶处理对Mg-6Al-5Pb-1.5In阳极腐蚀电化学性能的影响
金和喜1, 2,王日初1,彭超群1,石  凯1,陈雅谨1, 许泽辉2

(1. 中南大学 材料科学与工程学院,长沙 410083;
2. 永杰新材料股份有限公司,杭州 311222
)

摘 要: 在3.5% NaCl(质量分数)溶液中测定铸态和经固溶处理的Mg-6Al-5Pb-1.5In镁合金阳极的腐蚀电化学性能,采用金相(OM)、扫描电镜(SEM)和能谱分析(EDS)分别研究其显微组织、截面腐蚀形貌及相组成。结果表明:固溶后β-Mg17Al12相基本溶入α-Mg基体,降低微电偶腐蚀中阴极与阳极的面积比,增大阳极自腐蚀速率;Mg2Pb相的自腐蚀电位比镁基体正,固溶后Pb以Mg2Pb相析出,阳极表面腐蚀后晶粒中央的Mg2Pb相并没有被腐蚀。Al含量是决定镁阳极中各相腐蚀速率的关键,相表面形成的保护膜中Al含量越高,对基体保护性能越好。

 

关键字: 镁阳极;固溶处理;腐蚀电化学性能

Effects of solution treatment on corrosion electrochemical properties of Mg-6Al-5Pb-1.5In anodes
JIN He-xi1, 2, WANG Ri-chu1, PENG Chao-qun1, SHI Kai1, CHEN Ya-jin1, XU Ze-hui2

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Yongjie New Material Co., Ltd., Hangzhou 311222, China

Abstract:The corrosion electrochemical properties of as-cast and solid-solution-treated Mg-6Al-5Pb-1.5In alloy anodes were examined in 3.5% NaCl (mass fraction) solution. The microstructures, cross-sectional corrosion morphologies and composition of phases in the anodes were studied by optical microscopy (OM), scanning electronic microscopy (SEM)and energy dispersive spectrometry (EDS), respectively. The experimental results show that, the β-Mg17Al12 phase dissolves into the α-Mg matrix, the cathode-to-anode area ratio of the anodes decreases, and the self-corrosion rates increase after solution treatment. Pb segregates in the form of Mg2Pb and the electro-negativity of Mg2Pb is more positive than that of the α-Mg matrix, which results in the un-corroded Mg2Pb existing in the center of the corroded area at the surfaces of anodes. The aluminum content is a dominant factor of corrosion rate in magnesium anodes, and the higher the aluminum content of the protective film is, the better the protective properties to matrix is.

 

Key words: magnesium anodes; solution treatment; corrosion; electrochemical properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com