Electrochemical study of the dissolution of oxide films grown on type 316L stainless steel in molten fluoride salt

被引：29

作者：

Qiu, Jie ^{[1
]}

Macdonald, Digby D. ^{[1
]}

Schoell, Ryan ^{[2
]}

Han, Junsoo ^{[3
]}

Mastromarino, Sara ^{[1
]}

Scully, John R. ^{[3
]}

Kaoumi, Djamel ^{[2
]}

Hosemann, Peter ^{[1
,4
]}

机构：

[1] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA

[2] North Carolina State Univ, Dept Nucl Engn, Raleigh, NC 27607 USA

[3] Univ Virginia, Ctr Electrochem Sci & Engn, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA

[4] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

来源：

CORROSION SCIENCE | 2021年 / 186卷

基金：

美国国家科学基金会;

关键词：

Molten fluoride salt; Type 316L stainless steel; Corrosion; EIS; HASTELLOY-N SUPERALLOY; CORROSION BEHAVIOR; HIGH-TEMPERATURE; ALLOY; CONSTANT;

D O I：

10.1016/j.corsci.2021.109457

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The corrosion behavior of oxide films grown on Type 316L stainless steel (SS) in molten FLiNaK (LiF-NaF-KF: 46.5-11.5-42 mol.%) salt was investigated. The results show that the oxide film formed on Type 316L SS is unstable and can only temporarily protect materials from corrosion in molten FLiNaK salt. Based on the electrochemical impedance spectroscopy, the oxide dissolution rate is calculated to be 0.85 nm/h at 700 degrees C in molten FLiNaK salt. After the oxide film dissolved, Cr and Fe are selective dealloyed from the steel, leading to intergranular corrosion of Type 316L SS in molten fluoride salt.

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