冷凝液pH对消声器用409不锈钢腐蚀行为的影响
Effect of pH on Condensate Corrosion of Type 409 Stainless Steel for Automotive Mufflers
摘 要
采用极化曲线和电化学阻抗谱研究了消声器用409不锈钢在不同pH冷凝液中的腐蚀行为,并用X射线光电子能谱(XPS)分析了pH对409不锈钢钝化膜化学组成的影响.结果表明,试样在冷凝液pH为2时处于活化腐蚀状态,而冷凝液pH不低于3时处于钝化状态;在酸性条件下钝化膜富含铬的化合物、缺陷较多,试样腐蚀阻力相对较小,而在中/碱性条件下钝化膜富含铁的化合物、缺陷较少,试样腐蚀阻力较大.
不锈钢
冷凝液腐蚀
pH
钝化膜
automotive muffler
stainless steel
condensate corrosion
pH
passivation film
Abstract
The corrosion behavior of type 409 stainless steel in simulated muffler condensates with different pH values was studied by polarization curves and electrochemical impedance spectroscopy (EIS).The composition of passive films formed on 409 SS surfaces was analyzed by XPS.The results showed that 409 SS was in active corrosion state as pH was equal to 2,while it changed to passive state as pH increased to 3.The passive films formed under acidic conditions enriched in Cr-compounds with many defects while they enriched in Fe-compounds under neutral and alkaline conditions with less defects.As a result,409 SS showed much higher corrosion resistance in the neutral and alkaline condensate solutions than in the acidic ones.
中图分类号 TG174
所属栏目 试验研究
基金项目 国家自然科学基金(51134010)
收稿日期 2014/6/21
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备注李谋成(1970-),研究员,博士,从事腐蚀电化学相关研究.
引用该论文: MA Rong-yao,LI Mou-cheng,SHEN Jia-nian. Effect of pH on Condensate Corrosion of Type 409 Stainless Steel for Automotive Mufflers[J]. Corrosion & Protection, 2015, 36(5): 448
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参考文献
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【11】KUMAGAI M,MYUNG S T,KUWATA S,et al.Corrosion behavior of austenitic stainless steels as a function of pH for use as bipolar plates in polymer electrolyte membrane fuel cells[J].Electrochimica Acta,2008,53(12):4205-4212.
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