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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。
The influence of Mn on the corrosion resistance of weathering steels in simulated industrial atmosphere was studied by electrochemical impedance spectroscopy. The experimental results were verified by scanning electron microscope (SEM). The results of electrochemical impedance spectroscopy showed that high manganese weathering steel showed strong pitting reaction characteristics in the initial stage of corrosion and showed the same corrosion resistance as that of the steel in the late stage of corrosion. Under simulated industrial atmospheric corrosion, Mn did not enrich in the internal rust layer of the weathering steels, and Cr and Cu formed enrichment bands at the interface between the internal rust layer and the steel substrate, which was the main reason for the formation of the protective rust layer .