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.
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