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Acta Metall Sin  2023, Vol. 59 Issue (7): 905-914    DOI: 10.11900/0412.1961.2021.00418
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Effect of Cr Addition on the Corrosion Behavior of Twinning-Induced Plasticity Steel
SI Yongli1,2, XUE Jintao1,2, WANG Xingfu1, LIANG Juhua1, SHI Zimu1, HAN Fusheng1()
1Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
2Science Island Branch, Graduate School of University of Science and Technology of China, Hefei 230026, China
Cite this article: 

SI Yongli, XUE Jintao, WANG Xingfu, LIANG Juhua, SHI Zimu, HAN Fusheng. Effect of Cr Addition on the Corrosion Behavior of Twinning-Induced Plasticity Steel. Acta Metall Sin, 2023, 59(7): 905-914.

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Abstract  

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-xCr-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 1200oC 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, Fe2O3, FeOOH, MnO, MnO2, Cr2O3, 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.

Key words:  TWIP steel      corrosion resistance      Cr alloying      polarization measurement      oxide film     
Received:  28 September 2021     
ZTFLH:  TG172.5  
Fund: National Natural Science Foundation of China(51701206);National Natural Science Foundation of China(51671187);Foundation of President of Hefei Institutes of Physical Science, Chinese Academy of Sciences(YZJJ201703)
Corresponding Authors:  HAN Fusheng, professor, Tel: (0551)65591435, E-mail: fshan@issp.ac.cn

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00418     OR     https://www.ams.org.cn/EN/Y2023/V59/I7/905

SampleCMnCrSiNiMoTiFe
0Cr0.30424.490.020.0010.0180.0010.006Bal.
3Cr0.29424.393.070.0010.0200.0010.006Bal.
6Cr0.29924.225.930.0010.0180.0010.005Bal.
9Cr0.30224.468.370.0010.0200.0010.006Bal.
12Cr0.30324.8311.330.0010.0180.0010.006Bal.
Table 1  Chemical compositions of twinning-induced plasticity (TWIP) steel samples
Fig.1  XRD spectra of TWIP steel samples with different Cr contents
Fig.2  OM image of 12Cr sample
Fig.3  Potentiodynamic polarization curves of TWIP steel samples with different Cr contents (i—current density)
SampleEcorr / mVicorr / (10-6 A·cm-2)
0Cr-8181.5810
3Cr-4870.4701
6Cr-4680.4189
9Cr-2610.2244
12Cr-2230.0764
Table 2  Characteristic electrochemical parameters based on the potentiodynamic polarization curves
Fig.4  Nyquist plots of TWIP steel samples in 3.5%NaCl solution at room temperature (a) and locally enlarged Nyquist spectra of 0Cr, 3Cr, and 6Cr samples in Fig.4a (b) (Z'—real part of the im-pedance, Z''—imaginary part of the impedance)
Fig.5  Bode plots of TWIP steel samples in 3.5%NaCl solution at room temperature (|Z|—magnitude of the impedance)
Fig.6  Comparisons of experimental impedance and calculated impedance using K-K transforms for 0Cr sample in 3.5%NaCl solution
(a) Z' (b) -Z"
Fig.7  Comparisons of experimental impedance and calculated impedance using K-K transforms for 12Cr sample in 3.5%NaCl solution
(a) Z' (b) -Z"
Fig.8  Equivalent electrical circuit used to fit the impedance data of samples (CPE—constant phase angle element, Rs—solution resistance, Rct—charge transfer resistance)
SampleRsRs errorCPERctRct errorχ2
Ω·cm2%Y0 / (10-4 S·cm-2·s n )Y0 error / %nn error / %Ω·cm2%10-3
0Cr12.321.02211.5102.5780.94320.8605072.5634.470
3Cr12.040.4896.0311.1070.82400.33710991.1460.799
6Cr10.940.5692.5381.2070.78800.30815850.9820.818
9Cr13.221.1050.9611.7730.84660.42885702.2653.080
12Cr10.700.5141.0280.7280.86390.179144901.3490.682
Table 3  Fitting results of samples based on the EIS data and the model in Fig.8
Fig.9  OM (a1-e1) and SEM (a2-e2) images showing the surface morphologies after the potentiostatic polarization tests for 0Cr (a1, a2), 3Cr (b1, b2), 6Cr (c1, c2), 9Cr (d1, d2), and 12Cr (e1, e2) samples
Fig.10  XPS of 0Cr (a), 3Cr (b), and 6Cr (c) TWIP steel samples
Fig.11  XPS of 9Cr (a) and 12Cr (b) TWIP steel samples
Fig.12  Cationic fractions in surface film of samples based on the XPS results
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