FLiNaK-CrF3/CrF2氧化还原缓冲熔盐体系对316L不锈钢耐蚀性能的影响  

Corrosion Inhibition of 316L Stainless Steel in FLiNaKCrF 3/CrF2 Redox Buffering Molten Salt System

作　　者：秦越强 左勇[1,2,3] 申淼 QIN Yueqiang;ZUO Yong;SHEN Miao(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Dalian National Laboratory for Clean Energy,Chinese Academy of Sciences,Dalian 116023,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049 [3]中国科学院洁净能源创新研究院,大连116023

出　　处：《中国腐蚀与防护学报》2020年第2期182-190,共9页Journal of Chinese Society For Corrosion and Protection

基　　金：中国科学院战略先导专项(XDA02020400和XDA21000000)。

摘　　要：研究了316L不锈钢在FLiNaK-CrF3/CrF2氧化还原体系中的腐蚀行为,通过改变LiF-NaF-KF(FLiNaK)熔盐中[Cr^3+]/[Cr^2+]的浓度比值来调节熔盐电位,并用一种修正的Tafel方法测得316L不锈钢在不同电位下的氧化还原缓冲熔盐中的腐蚀电流密度。结果表明,实验温度为873和823 K时,使熔盐电位分别低于-0.741和-0.703 V,能有效抑制316L不锈钢在FLiNaK熔盐中的腐蚀。并通过传统的浸泡方法验证了这一结论。氧化还原缓冲熔盐还有另一重要特性,不同的金属或合金材料在熔盐中有着几乎一致的电位,这是使用修正的Tafel方法测得316L不锈钢在缓冲熔盐中的腐蚀电流密度的重要前提。The corrosion behavior of 316L stainless steel(316LSS)in FLiNaK-CrF3/CrF2 redox system has been studied in this paper.The corrosion rate of 316LSS in molten salt was found to be dependent on the salt potential,which can be adjusted by varying the ratio of the ion pairs([Cr^3+]/[Cr^2+])in the molten salt.When the salt potential was controlled below-0.741 V vs Ni/NiF2 at 873 K or-0.703 V vs Ni/NiF2 at 823 K,the corrosion of 316LSS in the molten salt can be effectively inhibited.This conclusion was verified by the immersion corrosion tests.Another important and interesting feature of the redox buffering molten salt is that different metal-or alloy-materials have almost identical potential in the salt.This effect is significant for applying the modified Tafel method in the redox buffering system.

关 键 词：氧化还原缓冲熔盐 熔盐电位 腐蚀电流密度 腐蚀抑制 316L不锈钢 

分 类 号：O646.6[理学—物理化学]