低碳贝氏体钢在三种典型环境中的腐蚀行为和腐蚀产物  

Corrosion behavior and corrosion products of a low carbon bainite steel in three kinds of typical environments

作　　者：崔雷[1] 杨善武[1] 王树涛[1] 高克玮[1] 柳伟[1] 贺信莱[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2009年第3期306-311,356,共7页Journal of University of Science and Technology Beijing

基　　金：国家重点基础研究发展计划资助项目(No.2004CB619102)

摘　　要：通过干湿循环加速腐蚀实验并结合X射线衍射、扫描电镜、能谱分析和N2吸附等方法,研究了低碳贝氏体钢在用相应溶液模拟的三种大气环境(海洋、工业和海洋工业大气)中加速腐蚀行为和腐蚀产物特征.实验结果表明,低碳贝氏体钢在三种环境中的腐蚀速率均低于商业化耐候钢09CuPCrNi.低碳贝氏体钢在上述三种环境中的腐蚀速率也有较大差别,其在含有复合腐蚀因子(Cl-和SO32-)的环境中腐蚀最为严重,而在只含腐蚀因子SO32-的环境中腐蚀程度最轻.在不同环境中形成的腐蚀产物相组成差别很小,但锈层致密程度相差较大,并且锈层越致密,对应的钢腐蚀速率越低.在三种环境中的腐蚀对钢的拉伸力学性能的影响较小,说明没有产生严重的局部腐蚀.Wet-dry cyclic accelerated corrosion tests together with XRD, SEM, EDS and N2 adsorption technology were employed to investigate the corrosion behavior and corrosion products of a low carbon hainite steel. The steel was subjected to three kinds of atmospheric environments, i.e. marine environment, industrial environment and marine industrial environment, which were simulated by corresponding solutions. It is found that the corrosion rates of the low carbon bainite steel are lower than that of the commercial weathering steel 09CuPCrNi in all the three kinds of environments. The corrosion rates of the hainite steel in the three kinds of environments are also different. In the environment containing both Cl^- and SO3^2- the corrosion is the most serious, while in the environment only containing SO3^2- the corrosion is the lightest. The distinction of corrosion products in the three kinds of environments is neglectable, while the compact degree of rust layers formed in different environments is obviously different. The more compact the rust layer is, the lower corrosion rate the steel exhibits. There is no serious selective corrosion in the bainite steel for the corrosion has little effect on its tensile mechanical properties.

关 键 词：低碳贝氏体钢 大气环境 腐蚀行为 腐蚀产物 

分 类 号：TG172.3[金属学及工艺—金属表面处理]