考察了表面涂有ZnCl2-KCl盐膜的纯Ni和M38G, GH864两种Ni基合金在450℃纯氧气氛中的耐蚀性. 结果表明: 3种材料均发生了加速性腐蚀,形成的表面产物膜十分疏松并与基体的粘附性较差;合金中较高的Cr含量并没有提供良好的保护性,其腐蚀速度高于纯Ni.分析了NiO与Cr2O3氧化膜在该环境中具有不同热力学稳定性的原因,并讨论了材料的加速腐蚀机理.
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