热浸镀55Al-Zn-1.6Si合金镀层在NaCl溶液中的腐蚀行为  

Corrosion Behavior of Hot-dip 55Al-Zn-1.6Si Alloy Coating in NaCl Solution

作　　者：杨增鹏[1] 李冰[1] 李谋成[1] 李谦[1] 张捷宇[1] 原鲜霞[2] 

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]上海交通大学化学工程系,上海200240

出　　处：《腐蚀科学与防护技术》2012年第5期401-405,共5页Corrosion Science and Protection Technology

基　　金：国家科技支撑计划(2007BAE09B03);上海市现代冶金与材料制备重点实验室开放课题基金(SELF-2011-03);贵州省"十一五"重大专项(20076003)资助

摘　　要：用盐雾试验和电化学阻抗谱法研究了热浸镀55%Al-Zn-1.6%Si合金镀层和某商用热浸镀锌层在5%NaCl溶液中的腐蚀行为,并用光学显微镜和扫描电镜分析了清除腐蚀产物后镀层表面组织形貌特征.结果表明,热浸镀55%Al-Zn-1.6%Si合金镀层耐盐雾腐蚀性约为商用热浸镀锌层的2.5倍.商用热浸镀锌层腐蚀表现出显著的扩散控制特征,而热浸镀55%Al-Zn-1.6%Si合金镀层腐蚀主要由电极表面电荷转移过程所控制.The corrosion behavior of the hot-dip 55%Al-Zn-1.6% Si alloy coating steel sheet and a commercial hot-dip Zn coating steel sheet in the 5% NaCl aqueous solution has been comparatively studied by the salt fog corrosion test and electrochemical impedance spectrum （EIS）. Optical microscope （OM） and Scanning Electron Microscope （SEM） have been employed to observe the surface characteristics of the corroded steel sheets after removel of the corrosion products. The results indicate that, the corrosion resistance of hot-dip 55%Al-Zn-1.6%Si alloy coating is 2.5 times higher than that of commercial hot-dip Zn coating. The corrosion of the commercial hot-dip Zn coating is mainly controled by the diffusion process on the electrode surface, while that of hot-dip 55%Al-Zn-1.6%Si alloy coating is mainly controlled by the charge transfer process.

关 键 词：热浸镀 合金镀层 盐雾腐蚀 电化学阻抗谱 

分 类 号：TG174.4[金属学及工艺—金属表面处理]