Cr2+/Cr3+对FLiNaK熔盐体系电偶腐蚀抑制行为及机理研究

2021-05-19 14:28:34 作者：左勇来源：中国腐蚀与防护学报分享至：

摘要

利用腐蚀电化学以及浸泡腐蚀实验结果表明，通过向FLiNaK熔盐体系引入Cr2+/Cr3+氧化还原缓冲离子对，可以使不同金属材料在该熔盐体系的电位差缩小乃至消除，并抑制不同金属材料之间的电偶腐蚀。

关键词：熔盐 ; 电偶腐蚀 ; 氧化还原缓冲离子对 ; 腐蚀抑制

Abstract

Galvanic corrosion should be considered when dissimilar metallic materials in contact with each other in a molten salt system of high ionic conductivity. Corrosion electrochemistry and immersion corrosion tests indicated that the difference of the corrosion potentials of different metal materials can be decreased or diminished by coupling Cr2+/Cr3+ into the 46.5%LiF-11.5%NaF-42.0%KF （in mole fraction） molten salt. Thus, the galvanic corrosion behavior between different metal materials can be effectively inhibited.

Keywords： molten salt ; galvanic corrosion ; redox buffering ion pair ; corrosion mitigation