镀锌层破损汽车钢板的腐蚀行为研究  

CORROSION PROPERTIES OF AUTO GALVANIZED STEEL SHEET WITH VARIOUS BROKEN AREAS OF THE ZINC COATING

作　　者：张红[1] 杜翠薇[1] 李晓刚[2] 齐慧滨[3] 

机构地区：[1]北京科技大学腐蚀与防护中心 [2]北京科技大学腐蚀与防护中心 北京 100083 [3]宝钢研究院焊接与表面技术研究所

出　　处：《中国腐蚀与防护学报》2009年第3期172-176,共5页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金项目(No.50571022);国家科技基础条件平台建设资助项目(No.2005DKA10400)

摘　　要：采用稀盐酸溶解汽车板部分镀锌层,研究了镀层破损率不同试样在5%NaCl溶液中的腐蚀行为,并对腐蚀产物形貌进行了观察.结果表明:在腐蚀初期,镀锌层试样的腐蚀速率高于基板,镀层的消耗对试样失重起主要贡献;试样的整体腐蚀速率随镀层破损率的增加而增大,且随腐蚀时间的延长而有所下降;采用电偶腐蚀电位、电化学阻抗谱(EIS)和动态极化等测量方法研究了镀层破损双相耦合电极的腐蚀电化学特性,所得结果基本一致.Research on the corrosion properties of the specimens of auto galvanized steel sheet with various broken areas of the zinc coating prepared by dissolution with a dilute hydrochloric acid solution were carried out in 5%NaCl solution in the present paper. The results show that in the initial period of time the corrosion mass-losses of the specimens with coating were higher than that of the specimen without coating, the loss of coating made the major part of contribution to the corrosion weigh-loss of specimen. The corrosion rates increased with the broken area of the coating and decreased with exposing time. In addition, the electrochemical characteristics of the duplex phase galvanic electrodes were studied by galvanic corrosion potential measuring, electrochemical impedance spectrum （EIS） and potentiodynamic polarization and compared with the corrosion results.

关 键 词：汽车钢板 镀锌层 破损 腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理]