Passivity of Type 2205 duplex stainless steel in acetic acid/sodium acetate buffer solutions containing thiosulfate

被引：1
作者：
Wang, Ke [1 ]
Bakhtiari, Sam [1 ]
Kovacs, Alex [1 ]
Sun, Xiao [2 ]
Rickard, William D. A. [2 ]
Salasi, Mobin [1 ]
Iannuzzi, Mariano [1 ]
机构：
[1] Curtin Univ, Fac Sci & Engn, Curtin Corros Ctr, Western Australia Sch Mines WASM, Perth, WA 6102, Australia
[2] Curtin Univ, John De Laeter Centre, Perth, WA 6102, Australia
来源：
ELECTROCHIMICA ACTA | 2023年 / 439卷
基金：
澳大利亚研究理事会;
关键词：
Stainless steel; Passivity; Sulfur; DFT; ToF-SIMS; SULFUR INDUCED CORROSION; PITTING CORROSION; SURFACE-CHEMISTRY; FILM; ADSORPTION; SULFATE; MICROSTRUCTURE; ALPHA-FE2O3; RESISTANCE; MECHANISM;
D O I：
10.1016/j.electacta.2022.141569
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Passivity of 2205 duplex stainless steel (DSS) with different surface pre-conditionings was investigated in thiosulfate-containing solutions using electrochemical tests, time-of-flight secondary ion mass spectrometry (ToF-SIMS) and density functional theory (DFT). While thiosulfate had no effect on air-passivated DSS in the primary passive range, it influenced fresh DSS when the air-passivated film was cathodically or mechanically removed. Surface analysis by ToF-SIMS revealed that iron sulfide was incorporated in the passive film formed on an air-passivated surface, while iron, chromium, and nickel sulfides were incorporated in the passive film formed on fresh surfaces. DFT modelling supported experimental observations.
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页数：10
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