双环电化学动电位再活化法评价11Cr铁素体不锈钢晶间腐蚀敏感性<sup>*</sup>

doi:10.11900/0412.1961.2015.00117

金属学报

2015, Vol. 51

Issue (11): 1349-1355 DOI: 10.11900/0412.1961.2015.00117

本期目录 | 过刊浏览

双环电化学动电位再活化法评价11Cr铁素体不锈钢晶间腐蚀敏感性^*

强少明¹,江来珠²,李劲¹,刘天伟³,吴艳萍³,蒋益明¹(

)

2 宝钢有限公司研发中心, 上海 201900
3 中国工程物理研究院表面物理与化学国家重点实验室, 绵阳 621907

EVALUATION OF INTERGRANULAR CORROSION SUSCEPTIBILITY OF 11Cr FERRITIC STAINLESS STEEL BY DL-EPR METHOD

Shaoming QIANG¹,Laizhu JIANG²,Jin LI¹,Tianwei LIU³,Yanping WU³,Yiming JIANG¹(

)

1 Department of Materials Science, Fudan University, Shanghai 200433
2 Research and Development Center, Baosteel Co. Ltd., Shanghai 201900
3 National Key Laboratory for Surface Physics and Chemistry Laboratory, Chinese Academy of Engineering Physics, Mianyang 621907

引用本文:

强少明,江来珠,李劲,刘天伟,吴艳萍,蒋益明. 双环电化学动电位再活化法评价11Cr铁素体不锈钢晶间腐蚀敏感性^*[J]. 金属学报, 2015, 51(11): 1349-1355.
Shaoming QIANG, Laizhu JIANG, Jin LI, Tianwei LIU, Yanping WU, Yiming JIANG. EVALUATION OF INTERGRANULAR CORROSION SUSCEPTIBILITY OF 11Cr FERRITIC STAINLESS STEEL BY DL-EPR METHOD[J]. Acta Metall Sin, 2015, 51(11): 1349-1355.

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摘要:

利用TEM, EDS和SAED等分析方法, 研究了11Cr 铁素体不锈钢409L在600 ℃敏化下析出物特性, 并将双环电化学动电位再活化法(DL-EPR)用于评价409L钢的晶间腐蚀敏感性, 通过研究DL-EPR的扫描速率、介质成分、介质温度对测试结果的影响, 对该方法进行了优化, 并用该优化法研究了敏化处理对409L钢晶间腐蚀敏感性的影响. 结果表明, 敏化的409L钢发生晶间腐蚀是由于M₂₃C₆沿晶界析出. 在最优化条件下, DL-EPR法能定量评价409L钢的晶间腐蚀敏感性且具有良好的重复性. 随敏化处理时间延长, 沿晶界析出的M₂₃C₆增多, 晶间腐蚀敏感性也随之增强.

关键词 ： 11Cr铁素体不锈钢, 双环电化学动电位再活化法, 晶间腐蚀, M₂₃C₆

Abstract：

Ferritic stainless steel (FSS) containg (11%~13%)Cr with low C and N has excellent comprehensive performances and thus can be widely applied in extensive fields such as automobile exhaust systems, containers, buses and so on. Among them, 409L steel containing 11%Cr has been increasingly used in applications for tail pipes in the cold end parts of automobile exhaust systems because of its good corrosion resistance and moderate price. During the manufacture process for these tail pipes, improper heat treatments and welding operations cause the precipitation of some detrimental phases such as carbides, nitrides, which leads to a reduction on the resistance to intergranular corrosion (IGC) due to the presence of Cr-depleted zone in the grain boundaries. In this work, the precipitates in grain boundaries of 409L steel aged at 600 ℃ were investigated using TEM, EDS and SAED. The double loop-electrochemical potentiokinetic reactivation (DL-EPR) method was extended for evaluating the IGC susceptibility of 409L steel. The operating conditions of the DL-EPR test for 409L steel were optimized by investigating the influences of the main test parameters, such as scanning rate, solution composition, solution temperature. The experimental results showed that the IGC occurred in aged 409L steel due to the precipitation of M₂₃C₆along grain boundaries. The optimized DL-EPR test could evaluate the IGC susceptibility of 409L steel quantitatively with high reproducibility. With the increase of aging time, much more M₂₃C₆ precipitated along grain boundaries, which resulted in 409L steel more susceptible to IGC.

Key words： 11Cr ferritic stainless steel double loop-electrochemical potentiokinetic reactivation intergranular corrosion M₂₃C₆

基金资助:* 国家自然科学基金项目51131008 和511340101, 国家科技支撑课题项目2012BAE04B00以及国家教育部博士点专项基金项目20120071110013 资助

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https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00117 或 https://www.ams.org.cn/CN/Y2015/V51/I11/1349

图1 Thermo-Calc模拟计算得到的409L钢中平衡态的各相含量

图2 409L钢600 ℃敏化4 h前后的晶界形貌的TEM像、EDS分析和SAED谱

图3 扫描速率为1.667 mV/s 时KSCN浓度对409L钢在30 ℃的0.5%H2SO4溶液中DL-EPR测试结果的影响

图4 扫描速率对409L钢在30 ℃的0.5%H2SO4+0.002%KSCN溶液中DL-EPR测试结果的影响

图5 扫描速率为1.667 mV/s时溶液温度对409L钢在0.5%H2SO4+0.002%KSCN溶液中DL-EPR测试结果的影响

图6 在最优化条件下409L钢在600 ℃敏化不同时间后的DL-EPR曲线

表1 409L钢在600 ℃敏化不同时间后在最优化条件下的DL-EPR测试结果

图7 最优化条件下下409L钢DL-EPR测试后的OM像

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