铝硅复合对Fe32Mn7Cr3Al2Si钢氧化改性层耐蚀性的影响

doi:10.11902/1005.4537.2021.103

中国腐蚀与防护学报

2022, Vol. 42

Issue (2): 317-323 DOI: 10.11902/1005.4537.2021.103

研究报告

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铝硅复合对Fe32Mn7Cr3Al2Si钢氧化改性层耐蚀性的影响

梁泰贺, 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大连 116028

Corrosion Performance of Transition Layer at Interface of Oxide Scale/substrate Formed on Austenitic Steel Fe32Mn7Cr3Al2Si During High Temperature Oxidation

LIANG Taihe, ZHU Xuemei(

), ZHANG Zhenwei, WANG Xinjian, ZHANG Yansheng

School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China

全文: PDF(6494 KB) HTML

摘要:

利用XRD、EPMA、阳极极化和电化学阻抗技术研究了铝硅复合合金化对Fe32Mn7Cr3Al2Si钢高温氧化诱发转变层的组织、成分及电化学腐蚀性能影响。在700和800 ℃空气中对Fe32Mn7Cr3Al2Si奥氏体钢进行循环氧化表面改性，形成的氧化层由内层Al₂O₃、中间层Mn₂SiO₄，外层Mn₂O₃组成。经800 ℃空气中循环氧化160 h后，在钢基体/氧化层界面形成了厚度约20 μm的贫Mn (11%)、富Cr (14%) 铁素体α相转变层。相比原始Fe32Mn7Cr3Al2Si钢，贫Mn富Cr的氧化改性层在1 mol/L Na₂SO₄溶液中的自腐蚀电位由-463 mV增至248 mV，维钝电流密度由2.8 μA/cm²降至0.4 μA/cm²，电荷转移电阻R_t由15.5 kΩ·cm²增至69.7 kΩ·cm²，铝硅复合加入可增加Fe32Mn7Cr3Al2Si钢氧化诱发贫Mn层中的Cr富集，显著提高钢的耐蚀性能。

关键词 ： Fe32Mn7Cr3Al2Si钢, 氧化表面改性, 氧化诱发转变层, 阳极极化曲线, 电化学阻抗

Abstract：

The microstructure, composition and electrochemical corrosion properties of the oxidation-induced transition layer on austenitic steel Fe32Mn7Cr3Al2Si was investigated by means of XRD, EPMA, anode polarization and electrochemical impedance measurement, respectively. The Fe32Mn7Cr3Al2Si austenitic steel was intentionally oxidized at 700 and 800 ℃ in air, respectively, the formed oxide scale was typically composed of Mn₂O₃ outer sublayer, Mn₂SiO₄ middle sublayer, and Al₂O₃ inner sublayer. A transition layer of α-ferrite with Mn-depletion of 11% and Cr-enrichment of 14% at the interface of oxide scale/steel matrix was occurred at 800 ℃ in air for 160 h. Compared with the original Fe32Mn7Cr3Al2Si austenitic steel, the transition layer exhibited an increased passivation ability in 1 mol/L Na₂SO₄ solution, correspondingly, the free-corrosion potential increased from -463 mV (SCE) to 248 mV (SCE), the free corrosion current density decreased from the 2.8 μA/cm² to 0.4 μA/cm², and the resistant R_t increased from 15.5 kΩ·cm² to 69.7 kΩ·cm². It follows that Al- and Si-alloying can promote the Cr enrichment in the Mn depletion layer and therefore, improve the corrosion resistance of Fe32Mn7Cr3Al2Si austenitic steel.

Key words： Fe32Mn7Cr3Al2Si steel surface modification oxidation-induced transformation anodic polarization electrochemical impedance spectroscopy

收稿日期: 2021-05-08

ZTFLH:

TG174

基金资助:国家自然科学基金(51575077)

通讯作者: 朱雪梅 E-mail: xmzhu@djtu.edu.cn

Corresponding author: ZHU Xuemei E-mail: xmzhu@djtu.edu.cn

作者简介: 梁泰贺，男，1996年生，硕士生

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引用本文:

梁泰贺, 朱雪梅, 张振卫, 王新建, 张彦生. 铝硅复合对Fe32Mn7Cr3Al2Si钢氧化改性层耐蚀性的影响[J]. 中国腐蚀与防护学报, 2022, 42(2): 317-323.
Taihe LIANG, Xuemei ZHU, Zhenwei ZHANG, Xinjian WANG, Yansheng ZHANG. Corrosion Performance of Transition Layer at Interface of Oxide Scale/substrate Formed on Austenitic Steel Fe32Mn7Cr3Al2Si During High Temperature Oxidation. Journal of Chinese Society for Corrosion and protection, 2022, 42(2): 317-323.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.103 或 https://www.jcscp.org/CN/Y2022/V42/I2/317

图1 Fe32Mn7Cr3Al2Si钢固溶处理后微观组织EBSD像

图2 Fe32Mn7Cr3Al2Si钢在空气中的循环氧化动力学曲线

图3 Fe32Mn7Cr3Al2Si钢氧化层的XRD谱

图4 Fe32Mn7Cr3Al2Si钢氧化层的表面形貌

图5 Fe32Mn7Cr3Al2Si钢在700 ℃空气中循环氧化160 h后截面元素EPMA图

图6 Fe32Mn7Cr3Al2Si钢在800 ℃空气中循环氧化160 h后截面元素EPMA图

图7 Fe32Mn7Cr3Al2Si钢在800 ℃空气中循环氧化160 h后表层的成分分布

图8 氧化改性前后Fe32Mn7Cr3Al2Si钢的阳极极化曲线

图9 氧化改性前后Fe32Mn7Cr3Al2Si钢的电化学阻抗谱

表1 氧化改性前后Fe32Mn7Cr3Al2Si钢电化学阻抗谱的拟合参数

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