Cl^-对镀锌钢板泥浆附着电偶保护距离的影响  

Influence of Cl^- on the galvanic protection distance of galvanized auto steel sheets covered with mud

作　　者：张红[1] 杜翠薇[1] 苏里[1] 齐慧滨[2] 李晓刚[1] 

机构地区：[1]北京科技大学材料科学与工程学院腐蚀与防护中心,北京100083 [2]宝钢研究院焊接与表面技术研究所,上海201900

出　　处：《北京科技大学学报》2008年第12期1342-1347,共6页Journal of University of Science and Technology Beijing

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

摘　　要：采用酸性鹰潭土壤泥浆对部分镀锌层去除而暴露出基体的汽车镀锌钢板进行了泥浆附着腐蚀实验和电化学测试.在钢的宽度相同的试样上测定了阴极保护距离,并研究了在泥浆中添加不同含量Cl-的影响.结果发现:在不含Cl-的泥浆中阴极保护距离随泥浆层厚度的增加而基本呈线性增加,出现红锈的程度也相应减小;随着Cl-含量和附着泥浆厚度的增加,阴极保护距离增加,并存在极大值.Cl-含量不仅影响着泥浆附着中的镀锌层破损试样表面平均腐蚀电流密度,而且对泥浆中的溶氧量、pH值和电导率等参数都有影响.泥浆层厚度和Cl-含量决定着试样的阴极保护距离和表面腐蚀状态.Galvanic protection distance （PD） and the effect of the addition of various contents of Cl^- on it were studied with galvanized auto steel sheet specimens whose zinc coating was partly removed and covered with Ying-tan soil mud. The results show that in the mud without Cl^- the PD value increase linearly with the thickness of mud layer, and the red-rust emerging time increases correspondingly. With increasing CI content and thickness of covered mud, the PD value raises and reaches a maximum. Cl^- content influences not only the average corrosion current density, but also the dissolved oxygen, pH value and electrical conductivity. The thickness of mud layer and Cl^- content control the PD value and surface corrosion state.

关 键 词：镀锌钢板 酸性土壤 泥浆附着 电偶保护 氯离子 

分 类 号：TG172.4[金属学及工艺—金属表面处理]