介质温度对含铌2120双相不锈钢点蚀性能的影响

梁奕明; 何福善; 谢文煊; 向红亮; 郑开魁

doi:10.15980/j.tzzz.2022.06.017

研究·合金性能 | 浏览量 : 0 下载量: 18 CSCD: 0

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介质温度对含铌2120双相不锈钢点蚀性能的影响
Effects of Medium Temperature on Pitting Corrosion of 2120 Duplex Stainless Steel Containing Nb
2022年42卷第6期页码：762-767
纸质出版日期： 2022 ，
DOI： 10.15980/j.tzzz.2022.06.017

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梁奕明, 何福善, 谢文煊, 等. 介质温度对含铌2120双相不锈钢点蚀性能的影响[J]. 特种铸造及有色合金, 2022,42(6):762-767.

Liang Yiming, He Fushan, Xie Wenxuan, et al. Effects of Medium Temperature on Pitting Corrosion of 2120 Duplex Stainless Steel Containing Nb[J]. Special Casting & Nonferrous Alloys, 2022,42(6):762-767.
梁奕明, 何福善, 谢文煊, 等. 介质温度对含铌2120双相不锈钢点蚀性能的影响[J]. 特种铸造及有色合金, 2022,42(6):762-767. DOI： 10.15980/j.tzzz.2022.06.017.

Liang Yiming, He Fushan, Xie Wenxuan, et al. Effects of Medium Temperature on Pitting Corrosion of 2120 Duplex Stainless Steel Containing Nb[J]. Special Casting & Nonferrous Alloys, 2022,42(6):762-767. DOI： 10.15980/j.tzzz.2022.06.017.

摘要

采用熔模铸造制备2120双相不锈钢和Nb含量为0.1%的2120双相不锈钢。用动电位极化曲线测试、电化学阻抗谱测试的电化学腐蚀方法，结合光学显微镜、扫描电镜、能谱分析等手段，分别研究了在不同温度下的3.5%的NaCl溶液中其耐点蚀行为及其影响规律。结果表明，Nb含量为0.1%的2120与2120双相不锈钢表面钝化膜稳定性随温度的升高而降低。随着介质温度升高，含Nb的2120与2120双相不锈钢的点蚀电位均呈现降低趋势，而自腐蚀电流密度增大。添加了Nb后，α相含量增加且基体上有富Nb相析出，不锈钢表面蚀孔尺寸也随温度的升高而增加。

Abstract

2120 duplex stainless steel（DSS） with and without 0.1% niobium content were prepared by investment casting. The pitting resistance and its influence law of the steel in 3.5% NaCl solution at different temperatures were investigated by electrochemical corrosion methods including potentiodynamic polarization curve test and electrochemical impedance spectroscopy test

combined with optical microscope

scanning electron microscope

and energy spectrum analysis. The results indicate that the stability of surface passivation film of both steels is decreased with the increase of temperature. Meanwhile

the pitting potential is reduced

while the self-corrosion current density is increased. The content of α is increased with niobium-rich phase precipitated in the matrix after Nb addition

and dimension of corrosion hole on the stainless steel surface is expanded with temperature increase.