Evaluation of intergranular corrosion susceptibility of UNS S31803 duplex stainless steel with an optimized double loop electrochemical potentiokinetic reactivation method

被引：113
|
作者：
Gong, Jia [1 ]
Jiang, Y. M. [1 ]
Deng, B. [1 ]
Xu, J. L. [1 ]
Hu, J. P. [2 ]
Li, Jin [1 ]
机构：
[1] Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China
[2] Univ Oxford, Chem Res Lab, Oxford OX1 3TA, England
来源：
ELECTROCHIMICA ACTA | 2010年 / 55卷 / 18期
基金：
美国国家科学基金会;
关键词：
Duplex stainless steel; SEM; Intergranular corrosion; Electrochemical potentiokinetic reactivation; Precipitation; SIGMA-PHASE; DETECTING SENSITIZATION; EPR TECHNIQUE; UNSS31803; MICROSTRUCTURE; PRECIPITATION; ENVIRONMENTS; TOUGHNESS; BEHAVIOR;
D O I：
10.1016/j.electacta.2010.03.086
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
In this study, an optimized double loop electrochemical potentiokinetic reactivation (DL-EPR) test was applied to evaluate the degree of intergranular corrosion (IGC) susceptibility of duplex stainless steel UNS S31803. The measurement in a solution of 2 M H2SO4 + 1 M HCl at 30 degrees C with a scan rate of 1.66 mV s(-1) can successfully be used to analyze the interactions between precipitation, chromium depletion, and IGC sensitization of the UNS S31803 steel, which was aged between 30 min and 48 h at 800 degrees C. To gain an insight into the phase transition, the specimens were analyzed by scanning electron microscopy (SEM) and electron dispersive X-ray spectroscopy (EDX). The results indicated healing due to re-diffusion of Cr and Mo from the sigma phase to the gamma(2) phase. (C) 2010 Elsevier Ltd. All rights reserved.
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页码：5077 / 5083
页数：7
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