Fe—Cr合金在450℃的KCl及KCl—ZnCl_2盐膜中的腐蚀

CORROSION BEHAVIORS OF Te-Cr ALLOYS INDUCED BY KCl AND KCl-ZnCl_2 at 450℃

研究了Ｆｅ－１０Ｃｒ，Ｆｅ－２５Ｃｒ两种合金在４５０℃于Ｋ，Ｚｎ 氯化物中的腐蚀．结果表明，与在ＫＣｌ－ＺｎＣｌ２熔盐中的 腐蚀不同．合金无论在固态的 ＫＣｌ还是熔融态的 ＫＣｌ－ＺｎＣｌ２盐膜下均发生了加速腐蚀，且在混合盐膜下的腐蚀更为严重，合金 的耐蚀性不随 Ｃｒ含量的增加而得到改善：Ｆｅ—Ｃｒ合金在上述两种腐蚀条件下的耐蚀性差异与氧的供应量有关，并导致保护性的

The corrosion behaviors of Fe-10Cr and Fe-25Cr alloys in mediums of KCl and KCl-ZnCl2 salt films at 450 ℃ were examined. Both the alloys suffered from accelerated corrosion beneath the salt films and severe attack was observed in the case of KCl-ZnCl2 mixture salts, while the corrosion - resistance became worse with increasing chromium content in the alloys. On the contrary, the corrosion-resistance of the alloys could be improved significantly with higher chromium content when corroded within molten KCl-ZnCl2 salts. This difference is mainly related to the different oxygen supplies under two corrosion conditions, which induces the different thermodynamic stabilities of the protective Cr2O3 scale.