低合金耐候钢在含氯离子环境中的腐蚀行为  

Corrosion behavior of low-alloy weathering steel in environment containing chloride ions

作　　者：高新亮[1] 付贵勤[1] 朱苗勇[1] 邓志银[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110819

出　　处：《北京科技大学学报》2012年第11期1282-1287,共6页Journal of University of Science and Technology Beijing

摘　　要：利用干湿周浸加速腐蚀实验对比研究了低合金钢A588和SPA--H在含氯离子环境下腐蚀行为,并利用金相显微镜、扫描电镜、X射线衍射和电子探针等方法分析了Ni、Mn对于低合金钢腐蚀行为的影响.结果表明:实验钢锈层中的物质主要由α--FeOOH、γ--FeOOH和Fe3O4组成,但其含量存在差异;Ni元素在内锈层含量高于外锈层,Mn元素在锈层的孔洞处富集;内锈层的致密程度高于外锈层;提高合金元素Mn和Ni的含量,可以提高内锈层的致密性,从而提高低合金钢的耐蚀性能.The corrosion behavior of two low-alloy weathering steels,A588 and SPA-H,in an environment containing chloride ions was investigated by alternate wet-dry accelerated corrosion tests.The effects of Ni and Mn elements on the corrosion behavior were studied by using optical microscopy,scanning electron microscopy（SEM）,X-ray diffraction（XRD） and electron microprobe analysis（EMPA）.It is shown that the rust layer is mainly composed of Fe3O4,γ-FeOOH and α-FeOOH;however,their contents are somewhat different for the two experimental steels.The content of Ni in the inner rust layer is higher than that in the outer rust layer,and Mn is enriched at pores in the rust layer.The inner rust layer is more compact than the outer rust layer.The compactness of the inner rust layer is improved by increasing the Ni and Mn contents,thereby increasing the corrosion resistance of the low-alloy steel.

关 键 词：耐候钢 大气腐蚀 氯离子 耐蚀性 

分 类 号：TG172.3[金属学及工艺—金属表面处理]