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材料工程  2017, Vol. 45 Issue (8): 83-87    DOI: 10.11868/j.issn.1001-4381.2015.001006
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
朱雪梅, 张振卫, 王新建, 张彦生
大连交通大学 材料科学与工程学院, 辽宁 大连 116028
Electrochemical Corrosion Behavior of Oxidation Layer on Fe30Mn5Al Alloy
ZHU Xue-mei, ZHANG Zhen-wei, WANG Xin-jian, ZHANG Yan-sheng
School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China
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摘要 将Fe30Mn5Al合金在800℃空气中循环氧化160h,在氧化层与基体之间获得厚度约为15μm的贫Mn,富Fe铁素体层,研究氧化改性贫Mn层对Fe30Mn5Al合金电化学腐蚀性能的影响。结果表明:在1mol·L-1 Na2SO4溶液中,与原始合金相比,贫Mn层的阳极极化曲线呈自钝化,自腐蚀电位Evs SCE从-750mV提高至-130mV,钝化电流密度ip从310μA/cm2下降至29μA/cm2;电化学交流阻抗谱(EIS)的容抗弧直径及|Z|值增加,相位角平台变宽,利用等效电路Rs-(Rt//CPE)拟合的极化电阻Rt由2.7kΩ·cm2增至9.9kΩ·cm2;贫Mn层比合金基体具有更好的抗蚀性能。
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关键词 Fe30Mn5Al合金氧化改性层阳极极化电化学交流阻抗    
Abstract:The Fe30Mn5Al alloy was oxidized at 800℃ in air for 160h, the oxidation-induced layer about 15μm thick near the scale-metal interface was induced to transform to ferrite and become enriched in Fe and depletion in Mn. The effect of the oxidation-induced Mn depletion layer on the electrochemical corrosion behavior of Fe30Mn5Al alloy was evaluated. The results show that in 1mol·L-1 Na2SO4 solution, the anodic polarization curve of the Mn depletion layer exhibits self-passivation, compared with Fe30Mn5Al austenitic alloy, and the corrosion potential Evs SCE is increased to -130mV from -750mV and the passive current density ip is decreased to 29μA/cm2 from 310μA/cm2. The electrochemical impedance spectroscopy(EIS) of the Mn depletion layer has the larger diameter of capacitive arc, the higher impedance modulus|Z|, and the wider phase degree range, and the fitted polarization resistant Rt is increased to 9.9kΩ·cm2 from 2.7kΩ·cm2 by using an equivalent electric circuit of Rs-(Rt//CPE). The high insulation of the Mn depletion layer leads to an improved corrosion resistance of Fe30Mn5Al austenitic alloy.
Key wordsFe30Mn5Al alloy    oxidation layer    anodic polarization    electrochemical impedance spectroscopy
收稿日期: 2015-08-12      出版日期: 2017-08-10
中图分类号:  TG174.422  
通讯作者: 朱雪梅(1964-),女,教授,硕士,主要从事金属材料腐蚀与防护,联系地址:大连交通大学材料科学与工程学院(116028),     E-mail:
朱雪梅, 张振卫, 王新建, 张彦生. Fe30Mn5Al合金氧化改性层的电化学腐蚀性能[J]. 材料工程, 2017, 45(8): 83-87.
ZHU Xue-mei, ZHANG Zhen-wei, WANG Xin-jian, ZHANG Yan-sheng. Electrochemical Corrosion Behavior of Oxidation Layer on Fe30Mn5Al Alloy. Journal of Materials Engineering, 2017, 45(8): 83-87.
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