研究了纯Fe, NF616和SS304钢在500℃含氯气氛中ZnCl2--KCl盐膜下的腐蚀行为. 结果表明, 3种材料都发生了加速腐蚀, 生成了较厚的氧化膜, 且在氧化膜与基体金属之间出现了熔融状氯化物混合盐. 此外, 合金在此环境中的抗腐蚀性随其Cr含量 的提高而显著提高, 这是在腐蚀过程中氧化膜内层出现了Fe--Cr尖晶石或Cr2O3阻挡了金属离子快速向外扩散的结果. 讨论了材料发生加速腐蚀的机制.
The corrosion behaviors of pure iron and two commercial steels were examined in presence of ZnCl2--KCl deposits in controlled atmosphere containing HCl at 500℃. All of three materials suffered accelerated corrosion by forming thick oxide scales, and complex chlorides mixed molten salts appeared between the oxide scales and substrate materials. However, materials with higher Cr content have better corrosion resistance due to the formation of Fe--Cr spinel or chromia in the inner part of oxide scales. The mechanism for the corrosion accelerated by molten chlorides deposits is discussed.
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