新型耐候钢和碳钢在模拟工业大气环境中的腐蚀行为与机理研究  

Corrosion Behaviors and Mechanisms of New Weathering Steel and Carbon Steel in Simulated Industrial Atmosphere

作　　者：张幸[1] 刘道新[1] 万兰凤[2] 李轩[1] 

机构地区：[1]西北工业大学腐蚀与防护研究室,西安710072 [2]上海梅山钢铁股份有限公司,南京210039

出　　处：《机械科学与技术》2010年第8期1025-1030,共6页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(50671085);国家863高技术研究发展计划项目(2007AA03Z521)资助

摘　　要：通过比较在模拟工业大气环境中的周期浸润腐蚀试验结果研究了两种新型耐候钢和传统Q235B碳钢的腐蚀行为。采用X射线衍射技术、电子探针分析技术、交流阻抗频谱分析技术以及显微压痕表征方法等对腐蚀产物膜的物相组成、合金元素分布情况、电化学特性及其与钢基材的结合强度等特性进行了综合分析,探讨了钢的耐腐蚀机理。结果表明:在模拟工业大气环境下,降低S含量、增加P含量、添加合金元素Cu、Ni、Cr的耐候钢具有良好的耐蚀性能。Cr、Ni和Cu元素在锈层中的局部富集促进了保护作用强的α-FeOOH相的形成,提高了锈层的阻抗,阻碍了腐蚀介质的渗透,从而提高了钢的耐腐蚀性能。Corrosion behaviors of two new weathering steels and Q235B carbon steel were investigated by alternate immersion corrosion test in simulated industrial atmospheric environment. The structure,alloying element distribution,electrochemical impendence spectroscopy （ EIS） and adhesion of the rust layer were studied using X-ray diffraction （ XRD） ,electron probe of micro-analyzer （ EPMA） ,corrosion electrochemical test and micro indentation technique. The anti-corrosion mechanisms were discussed. The results show that the weathering steel with low S, high P and Cu,Ni,Cr alloying elements was good in corrosion resistance in industrial atmospheric environment. The local enrichment of alloying elements Cu,Cr and Ni in rust layer promoted the formation of α-FeOOH phase and the increase of electrochemical impendence of the rust layer,which inhibiting the permeation of corrosion medium,and therefore enhanceing the corrosion resistance of the weathering steel.

关 键 词：耐候钢 耐蚀机理 锈层 物相 交流阻抗 

分 类 号：TG174[金属学及工艺—金属表面处理]