三种不锈钢在700℃熔融LiCl-Li_2O中的腐蚀行为研究

Corrosion Behavior of Three Stainless Steels in Molten LiCl-5%Li_2O at 700°C

采用失重法,并结合物相分析技术研究了B2205、B409及B439不锈钢在700℃熔融LiCl-5 mass%Li_2O中的腐蚀行为.结果表明,三种不锈钢均遭受严重腐蚀,且其腐蚀失重近似遵循线性规律.不锈钢的腐蚀速率随其Cr含量的增加而减小.不锈钢的快速腐蚀与循环的氯化-氧化反应有关.同时,Li也能快速内扩散形成相应的含锂化物.

The corrosion behavior of three stainless steels,i.e.B2205,B439 and B409 in molten LiCl-5 mass%Li_2O in air at 700℃was examined by mass-loss measurements as well as XRD and SEM analysis.According to the experimental results,the three steels underwent severe corrosion, and their corrosion followed approximately a linear rate raw.The corrosion rate of the steels decreased with the increase of Cr content.The accelerated corrosion of the steels is related to a cyclic chlorination/oxidation reaction process.Meanwhile,fast lithiation reaction was also observed.