<strong>Cr</strong>添加对孪生诱发塑性钢腐蚀行为的影响

doi:10.11900/0412.1961.2021.00418

金属学报

2023, Vol. 59

Issue (7): 905-914 DOI: 10.11900/0412.1961.2021.00418

研究论文

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Cr添加对孪生诱发塑性钢腐蚀行为的影响

司永礼¹^,², 薛金涛¹^,², 王幸福¹, 梁驹华¹, 史子木¹, 韩福生¹(

)

¹中国科学院合肥物质科学研究院固体物理研究所合肥 230031
²中国科学技术大学研究生院科学岛分院合肥 230026

Effect of Cr Addition on the Corrosion Behavior of Twinning-Induced Plasticity Steel

SI Yongli¹^,², XUE Jintao¹^,², WANG Xingfu¹, LIANG Juhua¹, SHI Zimu¹, HAN Fusheng¹(

)

¹Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
²Science Island Branch, Graduate School of University of Science and Technology of China, Hefei 230026, China

引用本文:

司永礼, 薛金涛, 王幸福, 梁驹华, 史子木, 韩福生. Cr添加对孪生诱发塑性钢腐蚀行为的影响[J]. 金属学报, 2023, 59(7): 905-914.
Yongli SI, Jintao XUE, Xingfu WANG, Juhua LIANG, Zimu SHI, Fusheng HAN. Effect of Cr Addition on the Corrosion Behavior of Twinning-Induced Plasticity Steel[J]. Acta Metall Sin, 2023, 59(7): 905-914.

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摘要:

通过动电位极化曲线、电化学阻抗谱(EIS)测试和X射线光电子能谱(XPS)分析等研究了Cr添加对Fe-25Mn-xCr-0.3C (x = 0、3、6、9、12，质量分数，%)孪生诱发塑性(TWIP)钢腐蚀行为的影响。结果表明，TWIP钢基体中Cr含量增加导致腐蚀电位显著增加和腐蚀电流密度明显降低。耐腐蚀性能改善还通过Nyquist图中电荷转移电阻随着Cr含量的增加而增加得到证实。XPS结果表明，准钝化膜由FeO、Fe₂O₃、FeOOH、MnO、MnO₂、Cr₂O₃和Cr(OH)₃等组成，并且随着Cr含量增加，Cr氧化物在最外层氧化物中逐渐富集，同时Fe氧化物和Mn氧化物逐渐减少。正是这种保护性Cr氧化膜提高了TWIP钢的耐腐蚀性能。

关键词 ： TWIP钢, 耐腐蚀性能, Cr合金化, 极化测试, 氧化物膜

Abstract：

High-Mn austenitic Fe-Mn-C twinning-induced plasticity (TWIP) steels are prospective candidates in many industrial fields, owing to their excellent mechanical properties. However, these steels show poor corrosion resistance, which affects their performance and prevents their applications particularly in aqueous environment. In this study, an effective way to improve the corrosion resistant property of TWIP steels was described by understanding the corrosion behavior of TWIP steel that was alloyed with Cr. A series of Fe-25Mn-xCr-0.3C (x = 0, 3, 6, 9, and 12, mass fraction, %) TWIP steels were prepared in a vacuum arc melting furnace using high purity raw materials (≥ 99.8%). Thereafter, the resulting steels were solution treated at 1200^oC for 2 h under an argon atmosphere. The effect of Cr addition on the corrosion behavior of the prepared TWIP steels was investigated using various analytical techniques including XRD, potentiodynamic polarization, electrochemical impedance spectroscopy, and XPS. XRD results showed that the TWIP steels with Cr content that ranged from 3% to 12% retained their single austenite phase. Moreover, increasing the concentration of Cr in the alloys substantially increased and decreased the corrosion potential and corrosion current density, respectively. These resulted in an improvement in the corrosion resistant property of the alloys, which was verified by the increase in the charge transfer resistance found in the Nyquist plots. Meanwhile, XPS results revealed that the prepared quasi-passive oxide film was composed of FeO, Fe₂O₃, FeOOH, MnO, MnO₂, Cr₂O₃, and Cr(OH)₃. Furthermore, these results showed the progressive enrichment of Cr oxides and decrease of both Fe and Mn oxides in the outermost oxide as the Cr content was increased. The improved corrosion resistance of the prepared TWIP steels was caused by the protective Cr oxide film.

Key words： TWIP steel corrosion resistance Cr alloying polarization measurement oxide film

收稿日期: 2021-09-28

ZTFLH:

TG172.5

基金资助:国家自然科学基金项目(51701206);国家自然科学基金项目(51671187);中国科学院合肥物质科学研究院院长基金项目(YZJJ201703)

通讯作者: 韩福生，fshan@issp.ac.cn，主要从事高强韧高吸能金属材料设计、组织与性能调控机制与方法研究

Corresponding author: HAN Fusheng, professor, Tel: (0551)65591435, E-mail: fshan@issp.ac.cn

作者简介: 司永礼，男，1992年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00418 或 https://www.ams.org.cn/CN/Y2023/V59/I7/905

表1 孪生诱发塑性(TWIP)钢样品主要化学成分 (mass fraction / %)

图1 不同Cr含量TWIP钢样品的XRD谱

图2 12Cr样品显微组织的OM像

图3 不同Cr含量TWIP钢样品的动电位极化曲线

表2 基于动电位极化曲线的特征电化学参数

图4 室温下TWIP钢样品在3.5%NaCl溶液中的Nyquist图

图5 室温下TWIP钢样品在3.5%NaCl溶液中的Bode图

图6 0Cr样品在3.5%NaCl溶液中的实验和K-K转换计算的阻抗比较

图7 12Cr样品在3.5%NaCl溶液中的实验和K-K转换计算的阻抗比较

图8 用于阻抗拟合的等效电路

表3 基于EIS数据和图8模型的样品拟合结果

图9 恒电位极化测试后TWIP钢样品表面形貌的OM像和SEM像

图10 0Cr、3Cr和6Cr样品的XPS

图11 9Cr和12Cr样品的XPS

图12 基于XPS结果的样品表面膜的阳离子分数

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