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Journal of Chinese Society for Corrosion and protection  2024, Vol. 44 Issue (6): 1589-1600    DOI: 10.11902/1005.4537.2024.064
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Microstructure and Corrosion Resistance of Cu-containing Fe-Mn-Cr-Ni Medium-entropy Alloy Prepared by Selective Laser Melting
YI Shuo1, ZHOU Shengxuan1, YE Peng1, DU Xiaojie1, XU Zhenlin1,2, HE Yizhu1,2()
1. School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan 243032, China
2. Anhui Key Laboratory of Materials and Processing, Anhui University of Technology, Ma'anshan 243032, China
Cite this article: 

YI Shuo, ZHOU Shengxuan, YE Peng, DU Xiaojie, XU Zhenlin, HE Yizhu. Microstructure and Corrosion Resistance of Cu-containing Fe-Mn-Cr-Ni Medium-entropy Alloy Prepared by Selective Laser Melting. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1589-1600.

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Abstract  

The Cu-containing Fe-Mn-Cr-Ni medium entropy alloy (MEA) was prepared by selective laser melting (SLM) and followed by post aging treatment, and then its microstructure and corrosion performance in 1 mol/L NaOH solution were studied. The results show that the Cu-rich phase at grain boundaries of SLM-MEA is preferentially dissolved after aging at 300oC, which inhibits the dissolution of the active site and improves the corrosion resistance. Compared with the SLM alloy, the corrosion current of the alloy after being aged at 300oC decreased by 37.37% and the polarization resistance increased by 2 times. As the aging temperature increased, the Cu-rich precipitates migrate from grain boundaries to the interior of the cellular sub-crystal. Cr-rich carbides coarsened with the increasing temperature, which weakened the protective ability of the passivation film. In addition, the dissolution of Cu-rich precipitates in the alloy aged at 300oC increased the cation ratio of Cr + Ni to Fe + Mn in the passivation film, which was 1.2 times that of the as prepared SLM alloy, and promoted the formation of a denser and continuous passivation film.
Key words:  medium entropy alloy      selective laser melting      aging treatment      microstructure      corrosion resistance     
Received:  01 March 2024      32134.14.1005.4537.2024.064
ZTFLH:  TG174  
Fund: National Natural Science Foundation of China(51971001);Key Research and Development Project of Anhui Province(2022a05020017)
Corresponding Authors:  HE Yizhu, E-mail: heyizhu@ahut.edu.cn
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YI Shuo
ZHOU Shengxuan
YE Peng
DU Xiaojie
XU Zhenlin
HE Yizhu

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.064     OR     https://www.jcscp.org/EN/Y2024/V44/I6/1589

Fig.1  Medium entropy alloy powder: (a) powder morphology, (b) distribution of powder size, (c) etched cross-section and compositional analysis
Fig.2  Schematic diagram of the scanning strategy and cutting position of the specimen
Fig.3  XRD patterns of SLM MEA after aging treatments (a) and enlarged pattern of (200) (b)
Fig.4  Microstructure of SLM MEA after different aging treatments: (a, b) UT, (c, d) AT-200, (e, f) AT-300, (g, h) AT-500, (i, j) AT-700
SampleSpectrum pointFeMnCrNiCuC
AT-200146.9020.8111.9210.046.473.86
247.5521.1812.3110.524.923.52
AT-300340.1621.1911.9611.4411.773.47
446.5019.7213.3211.094.744.57
AT-500542.0119.6711.8712.089.494.89
646.5120.2013.9010.815.094.17
AT-700746.9317.2418.479.274.953.14
836.1517.9623.918.4511.082.45
Table 1  Chemical composition of the marked point in Fig.4
Fig 5  OCP of samples with different aging states in 1 mol/L NaOH solution
Fig.6  Dynamic potential polarization curves (a) and relative parameters (b) of samples under different aging states
Fig.7  Nyquist (a), impedance module (b) and phase angle (c) plots of samples with different aging states in 1 mol/L NaOH solution and equivalent circuit (d)
Sample

Rs

Ω·cm2

Cf

Ω-1·cm-2·s n

Rf

Ω·cm2

Qdl

Ω-1·cm-2·s n

n2

Rct

Ω·cm2

W

Ω-1·cm-2·s n

Cd

Ω-1·cm-2·s n

Rt

Ω·cm2

UT33.867.831 × 10-616.121.418 × 10-40.70283.494 × 1027.720 × 10-33.347 × 10-54.014 × 102
AT-20024.206.228 × 10-614.221.515 × 10-40.60616.725 × 1022.998 × 10-32.721 × 10-57.472 × 102
AT-30027.456.167 × 10-624.381.076 × 10-50.42787.650 × 1023.461 × 10-32.594 × 10-57.912 × 102
AT-50049.356.280 × 10-618.065.290 × 10-50.42446.699 × 1022.636 × 10-32.958 × 10-56.957 × 102
AT-70058.148.544 × 10-614.156.381 × 10-40.42112.911 × 1023.243 × 10-34.999 × 10-53.447 × 102
Table 2  Fitted values of the parameters in the equivalent circuit
Fig.8  Electrochemical surface morphologies of samples with different aging states in 1 mol/L NaOH solution: (a) UT, (b) AT-200, (c) AT-300, (d) AT-500, (e) AT-700
Fig.9  3D electrochemical corrosion morphologies (a-e) and corresponding corrosion depth (f) of UT (a), AT-200 (b), AT-300 (c), AT-500 (d) and AT-700 (e)
Fig.10  XPS spectra of passive film formed after 7 d of immersion in 1 mol/L NaOH solution: (a1-a6) UT, (b1-b6) AT-300
Fig.11  Cation content (atomic fraction) in passive film of UT (a) and AT-300 (b) formed by immersion in 1 mol/L NaOH solution for 7 d
Fig.12  Schematic illustration showing the corrosion processes in 1 mol/L NaOH solution: (a, b) UT; (c, d) AT-300, (e, f) AT-700
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