Studies on the degree of sensitization of hyper-duplex stainless steel 2707 at 900°C using a modified DL-EPR test

被引：29

作者：

Sun, Li ^{[1
,2
]}

Sun, Yangting ^{[1
]}

Lv, Chenxi ^{[1
]}

Liu, Yuanyuan ^{[1
]}

Dai, Nianwei ^{[1
]}

Jiang, Yiming ^{[1
]}

Li, Jin ^{[1
]}

Macdonald, Digby D. ^{[2
]}

机构：

[1] Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China

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

来源：

CORROSION SCIENCE | 2021年 / 185卷

基金：

中国国家自然科学基金;

关键词：

Corrosion resistance; HDSS; 2707; Degree of sensitization; Precipitates; INTERGRANULAR CORROSION SUSCEPTIBILITY; PHASE-TRANSFORMATION; REACTIVATION TEST; MECHANICAL-PROPERTIES; SELECTIVE CORROSION; PITTING CORROSION; BEHAVIOR; RESISTANCE; MICROSTRUCTURE; PRECIPITATION;

D O I：

10.1016/j.corsci.2021.109432

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of thermal aging of hyper-duplex stainless steel (HDSS) 2707 at 900 degrees C for various aging times up to 26 h on the localized, selective corrosion were investigated by electrochemical methods. The results demonstrate that the optimum test condition is 2 M H2SO4 + 1.25 M HCl + 0 0.001 M KSCN with the scan rate of 1.5 mV.s (-1) at 30 degrees C. The degree of sensitization (DOS) of HDSS 2707 initially increases rapidly, because of particle precipitation (sigma phase/Cr2N), and then decreases as a result of self-healing by back diffusion of Cr and Mo into the depleted areas, peaking at 10h.

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