Fe30Mn5Al合金氧化改性层的电化学腐蚀性能

doi:10.11868/j.issn.1001-4381.2015.001006

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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E_{vs SCE}从-750mV提高至-130mV，钝化电流密度i_p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R_s-（R_t//CPE）拟合的极化电阻R_t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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	朱雪梅
	张振卫
	王新建
	张彦生

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 E_{vs SCE} is increased to -130mV from -750mV and the passive current density i_p 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 R_t is increased to 9.9kΩ·cm² from 2.7kΩ·cm² by using an equivalent electric circuit of R_s-(R_t//CPE). The high insulation of the Mn depletion layer leads to an improved corrosion resistance of Fe30Mn5Al austenitic alloy.

Key words： Fe30Mn5Al 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

基金资助:国家自然科学基金资助项目(59901003)

通讯作者: 朱雪梅 E-mail: xmzhu@djtu.edu.cn

作者简介: 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:xmzhu@djtu.edu.cn

引用本文:

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.
Xue-mei ZHU, Zhen-wei ZHANG, Xin-jian WANG, Yan-sheng ZHANG. Electrochemical Corrosion Behavior of Oxidation Layer on Fe30Mn5Al Alloy. Journal of Materials Engineering, 2017, 45(8): 83-87.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.001006 或 http://jme.biam.ac.cn/CN/Y2017/V45/I8/83

Fig.1 Fe30Mn5Al合金在800℃空气中循环氧化160h后的表面SEM图

Fig.2 Fe30Mn5Al合金在800℃空气中循环氧化160h后的横截面SEM图

Fig.3 Fe30Mn5Al合金在800℃空气中循环氧化160h的XRD图谱

Fig.4 Fe30Mn5Al合金在800℃空气中循环氧化160h后的横截面元素EPMA图
(a) O；(b) Fe；(c) Mn；(d) Al

Fig.5 Fe30Mn5Al合金在800℃空气中循环氧化160h后的表层成分-深度分布曲线

Fig.6 Fe30Mn5Al合金氧化改性层与Fe30Mn5Al合金在1mol·L^-1 Na₂SO₄溶液中的阳极极化曲线

Fig.7 Fe30Mn5Al合金氧化改性层与Fe30Mn5Al合金在1mol·L^-1 Na₂SO₄溶液中的电化学交流阻抗谱
(a)Nyquist polt；(b)Bode polt

Table 1 Fe30Mn5Al合金氧化改性层与Fe30Mn5Al合金在1mol·L^-1 Na₂SO₄溶液中电化学交流阻抗谱的拟合参数

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