环境变迁对Q235和09CuPCrNi-A钢早期腐蚀行为的影响  

Influence of Environmental Alternation on Early Stage Corrosion of Q235 and 09CuPCrNi-A Steel

作　　者：吴军[1] 王秀静[1] 罗睿[1] 张三平[1] 周建龙 

机构地区：[1]武汉材料保护研究所,武汉430030 [2]武汉双虎涂料有限公司,武汉430035

出　　处：《中国腐蚀与防护学报》2014年第5期465-471,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金项目(51131007)资助

摘　　要：通过现场曝晒实验,采用SEM,EDS,XRD及电化学测量方法研究了Q235碳钢和09CuPCrNi-A耐候钢在武汉城市大气和武汉石化环境中交叉曝晒180 d后的腐蚀行为和规律。结果表明:Q235碳钢和09CuPCrNi-A耐候钢在武汉大气和武汉石化环境中交叉曝晒早期锈层表面凹凸不平,多裂纹和孔隙。不同环境条件下,早期腐蚀形成的锈层对后期腐蚀会产生影响,环境的变化会影响锈层的演化。从腐蚀动力学和极化曲线结果来看,存在I武汉站连续曝晒<I武汉/石化交叉曝晒<I石化/武汉交叉曝晒<I石化站连续曝晒的关系。The corrosion behavior for carbon steel Q235 and weathering steel 09CuPCrNi-A has been studied by alternative field exposure in a site of urban atmosphere and a site of petrochemical environment at Wuhan metropolis for 180 d and then the steel samples were examined by means of SEM, EDS, XRD and electrochemistry measurement. The results show that the surface of the rust layer is non-uniform with many cracks and pores for the steels exposed both in Wuban urban atmosphere and Wuhan petrochemical environment; the rust layer formed in the early stage will have an impact on that in the later stage; and the changes in the environment will affect the evolution of the rust layer. The corrosion kinetics and polarization curve results show that the free corrosion current densities of the steels measured after exposure may exist a ranking as follows： Isuccessionally exposure in Wuhan urban atmosphere 〈Iexposure in Wuhan urban atmosphere/Wuhan petrochemical environment 〈 Iexposure in Wuhan petrochemical environment/Wuhan urban atmosphere 〈I successionally exposure in Wuhan petrochemical environment.

关 键 词：Q235碳钢 09CuPCrNi-A耐候钢 大气腐蚀 电化学 

分 类 号：TG174.4[金属学及工艺—金属表面处理]