Corrosion Behavior of High-Mn Austenitic Fe-Mn-Al-Cr-C Steels in NaCl and NaOH Solutions.

Corrosion Behavior of High-Mn Austenitic Fe-Mn-Al-Cr-C Steels in NaCl and NaOH Solutions.
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DOI:
10.3390/ma14020425
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发表时间:
2021-01-16
期刊:
Materials (Basel, Switzerland)
影响因子:
--
通讯作者:
Bastidas DM
Bastidas DM
中科院分区:
其他
文献类型:
--
作者:
Bosch J;Martin U;Aperador W;Bastidas JM;Ress J;Bastidas DM

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研究了Fe-Mn-Al-Cr-C系孪晶诱发塑性钢和微带诱发塑性钢在不同合金元素含量(22.6-30 wt.%)下的腐蚀行为Mn,5.2-8.5重量% Al,3.1-5.1重量% Cr,至0.68-1.0重量% C在3.5wt.% NaCl(pH 7)和10重量% NaOH(pH 14)溶液。使用动电位极化和电化学阻抗谱(EIS)技术,以及光学显微镜分析得到的结果,揭示点蚀作为主要的腐蚀机制在高锰Td 3钢。表面的X射线衍射分析显示,主要的腐蚀产物是赤铁矿(Fe 2 O3),褐锰矿(Mn 2 O3),黑锰矿(Mn 3 O 4),和二元氧化物尖晶石也被确定,如方铅矿(MnAl 2 O 4)和铁锰矿(MnFe 2 O 4)。这是由于Fe和Mn的溶解速率更高,其呈现更活跃的氧化还原电位。此外,还发现了保护性的Al 2 O3钝化膜,显示出增强的腐蚀保护。MBIP钢(30重量%)在两种电解质中表现出最高的腐蚀敏感性锰)。在氯化物和碱性溶液中均观察到点蚀。
The corrosion behavior of austenitic Fe–Mn–Al–Cr–C twinning-induced plasticity (TWIP) and microband-induced plasticity (MBIP) steels with different alloying elements ranging from 22.6–30 wt.% Mn, 5.2–8.5 wt.% Al, 3.1–5.1 wt.% Cr, to 0.68–1.0 wt.% C was studied in 3.5 wt.% NaCl (pH 7) and 10 wt.% NaOH (pH 14) solutions. The results obtained using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques, alongside optical microscopy analysis, revealed pitting as the dominant corrosion mechanism in high-Mn TWIP steels. An X-ray diffraction analysis of the surface revealed that the main corrosion products were hematite (Fe2O3), braunite (Mn2O3), and hausmannite (Mn3O4), and binary oxide spinels were also identified, such as galaxite (MnAl2O4) and jacobsite (MnFe2O4). This is due to the higher dissolution rate of Fe and Mn, which present a more active redox potential. In addition, a protective Al2O3 passive film was also revealed, showing enhanced corrosion protection. The highest corrosion susceptibility in both electrolytes was exhibited by the MBIP steel (30 wt.% Mn). Pitting corrosion was observed in both chloride and alkaline solutions.
DOI: 10.1002/srin.202000076
发表时间: 2020-05-04
影响因子: 2.2
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期刊: CORROSION
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