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-x Cr-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、Fe_(2)O_(3)、FeOOH、MnO、MnO_(2)、Cr_(2)O_(3)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。
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-x Cr-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,Fe_(2)O_(3),FeOOH,MnO,MnO_(2),Cr_(2)O_(3),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.
作者
司永礼
薛金涛
王幸福
梁驹华
史子木
韩福生
SI Yongli;XUE Jintao;WANG Xingfu;LIANG Juhua;SHI Zimu;HAN Fusheng(Institute of Solid State Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Science Island Branch,Graduate School of University of Science and Technology of China,Hefei 230026,China)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第7期905-914,共10页
Acta Metallurgica Sinica
基金
国家自然科学基金项目Nos.51701206和51671187
中国科学院合肥物质科学研究院院长基金项目No.YZJJ201703。
