为了解镁基三元氯化物熔盐 NaCl-CaCl₂ -MgCl₂ 在储热过程中对奥氏体不锈钢的 腐蚀性，采用质量损失法研究了 5 种不锈钢( 201、304、310S、316L 和 321 型) 在该熔盐中 的短期腐蚀行为． 对抗腐蚀性较好的 316L 不锈钢进行了长期腐蚀性研究，采用 XＲD 和 SEM 分析了腐蚀层的物相和形貌随腐蚀时间的变化． 结果表明: 金属在无盖坩埚中比在 加盖坩埚中的浸没腐蚀质量损失更大; 其中含 Mo 的 316L 不锈钢在加盖坩埚中于 500、 600 和 700℃对熔盐均表现出了较好的耐腐蚀性，316L 不锈钢在 600 ℃下的腐蚀速率为 0． 347mm/y; 腐蚀 5d 后 316L 不锈钢表面仍呈现金属基底的衍射峰，但 10 d 后表面出现 MgO 的衍射峰; 腐蚀5d 后316L 不锈钢表面呈多孔状态，10d 后前期腐蚀形成的孔洞逐渐 被 MgCl 2 高温水解生成的 MgO 填充．

In order to understand the corrosion of the austenitic stainless steel in the molten salt of the ternary mag- nesium-based chloride NaCl-CaCl₂ -MgCl₂ during a thermal storage,the corrosion behaviors of five kinds of stainless steels (201,304,310S,316L and 321) after being corroded in the molten salt in a short term were investigated by means of the mass loss measurement.Then,a long-term corrosion test on 316L stainless steel which had shown a better corrosion resistance in the short-term corrosion test was conducted.Finally,the changes of the corrosion phase and morphology with the corrosion time were analyzed by means of XRD and SEM.The results show that (1) when the five kinds of stainless steels are immersed in an open crucible full of the molten salt,they suffer more ob- vious corrosion mass loss than those with a capped crucible do; (2) 316L stainless steel which contains Mo shows a better corrosion resistance at any one of 500,600 and 700 ℃,furthermore,the annual corrosion rate of 316L stainless steel at 600℃ is 0. 347mm per year; (3) the diffraction peak of 316L stainless steel substrate still ap- pears in the pattern after a five-day corrosion,but after a ten-day immersion,the diffraction peak of MgO appears; and (4) the surface of 316L stainless steel is porous after a five-day corrosion,and then,after a ten-day immer- sion,the corrosion pores are gradually filled by MgO,which is formed by means of the hydrolysis of MgCl₂2 at high temperatures.