模拟工业大气条件下高锰耐候钢的腐蚀行为

CORROSION BEHAVIOR OF WEATHERING STEEL WITH HIGH MANGANESE CONTENT IN CONDITION SIMULATIING INDUSTRIAL ATMOSPHERE

应用电化学阻抗谱研究了在模拟工业大气的腐蚀溶液中Mn对耐候钢耐腐蚀性能的影响,并通过锈层电子探针面扫描验证了实验结果。电化学阻抗谱结果显示,在腐蚀初期高锰耐候钢表现出较强的点蚀反应特征,腐蚀后期则显示和比对钢相同的耐腐蚀能力。在模拟工业大气腐蚀条件下,Mn在耐候钢的内锈层中没有产生富集,Cr和Cu在内锈层和钢基体界面中形成了富集带,这是保护性锈层生成的主要原因。

In order to clarify the influence of elemental Mn on corrosion resistance of weathering steel in solution simulating industrial atmosphere,EIS（electrochemical impedance spectrum） were measured and the obtained results were verified by EPMA（electron probe micro-analyzer）.EIS tests showed that,at the early stage of corrosion,the weathering steel with high Mn content had a more remarkable pitting generation characteristic than the reference steel.At the late stage of corrosion,two experimental steels had comparable corrosion resistance.The result of EPMA proved that Cu and Cr were main contributors to form protective rust layer because they were enriched at the interface between inner rust layer and substrate but no enrichment of Mn in the rust was observed.