汽车钢板的泥滴腐蚀行为  

Corrosion Behavior of Automobile Sheet under Mud Drops

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

机构地区：[1]宝山钢铁股份有限公司,上海201900 [2]北京科技大学腐蚀与防护中心,北京100083

出　　处：《世界钢铁》2009年第6期52-56,共5页World Iron & Steel

摘　　要：针对汽车车身常常发生的泥浆附着加速腐蚀问题,选择鹰潭、格尔木和库尔勒三种理化特性不同的典型土壤,加水调制成泥膏,模拟"盐水滴腐蚀实验",在实验室中研究汽车车身用热镀锌板和IF钢基板泥滴附着腐蚀行为,并利用SEM和EDS对腐蚀区微观形貌和腐蚀产物组成进行观察分析。结果表明:在室温环境暴露7h后,两种试样均发生了腐蚀,热镀锌板的腐蚀比IF钢板轻;三种泥膏的侵蚀性顺序为:鹰潭>库尔勒>格尔木;影响泥滴腐蚀的主要因素包括pH值、含水量、土质和含盐量等。土质不同,土壤的成膏性和粘性差别较大,因而含水量和保湿性差异较大,直接影响泥膏对金属腐蚀作用有效时间的长短。The adhesion of slurry to the body of automobiles usually leads to accelerated corrosion on the car body. This paper studies in the laboratory the corrosion behavior of the GI and IF steel sheet for automobile application covered with mud drops. To simulate the saline drop corrosion experiment, the pastes were made of three types of soil with different physical and chemical properties from Ying Tan, Ge Er Mu and Ku Er Le respectively, and mixed with a proper amount of water. The microstructre of the corrosion area and the corrosion products were observed and determined by SEM and EDS. The results show that all the samples suffered from corrosion after exposure for 7 h and the corrosion of GI steel was lighter. The most corrosive paste was made of soil from Ying Tan, and the least corrosive was made of soil from Ge Er Mu. The pH, water content, soil properties and salt content are the main factors which influence the corrosion on steel under mud drops. The ability to be paste and the viscosity of the three types of soil are different, so the water content and moisture - retention capacity of the mud are different, which directly affects the effective duration of corrosion on the steel under the mud.

关 键 词：热镀锌钢板 IF钢板 泥滴附着 腐蚀 

分 类 号：U465.11[一般工业技术—材料科学与工程] TG142.71[机械工程—车辆工程]