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. 2024 Dec 9;10(24):e41062.
doi: 10.1016/j.heliyon.2024.e41062. eCollection 2024 Dec 30.

Microstructure and corrosion resistance of high entropy alloy (AlNiCoCrFe) coatings prepared by TIG process

Mahmoud Ardeshir  1 , Mardali Yousefpour  1 , Seyad Mohammad Sadegh Nourbabksh  1 , Mansoor Bozorg  2
Affiliations

Microstructure and corrosion resistance of high entropy alloy (AlNiCoCrFe) coatings prepared by TIG process

Mahmoud Ardeshir et al. Heliyon. .

Abstract

Corrosion resistance, hardness and other mechanical properties of high entropy alloys are enhanced due to the addition of the proper elements. In this study, an equimolar powder mixture of AlNiCoCrFe was prepared as a coating material on plain carbon steel. It was produced by gas tungsten arc welding with the electrical currents of 90, 110 and 130 A. Experimental results demonstrated that at the electrical current of 110 A, the AlNiCoCrFe layer contained two-phase structures of BCC and FCC. The layer exhibited improved hardness from about 180 to 650 HVN. The potentiodynamic polarisation and electrochemical impedance spectroscopy of the AlNiCoCrFe alloys, obtained in 1M HCl solutions, showed that corrosion resistance of steel substrate could be considerably improved by preparing an AlNiCoCrFe coating on its surface. Polarisation resistance increased from 62.5 to 834 Ωcm2. Furthermore, electrochemical measurements revealed that optimum corrosion resistance were obtained at 110 A electrical current.

Keywords: Electrochemical measurements; FCC solid solution; Gas tungsten arc; Hard facing coating; High entropy alloy.

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Conflict of interest statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Figures

Image 1
Graphical abstract
Fig. 1
Fig. 1
Influence of the TIG current on the depth of the melt pool.
Fig. 2
Fig. 2
SEM images of the TIG current on the depth of the melt pool of (a) 90, (b) 110 and (c) 130 A.
Fig. 3
Fig. 3
SEM microstructure of the cross-section of the coating/substrate at TIG current of (a) 90, (b) 110 and (c) 130 A.
Fig. 4
Fig. 4
EDS of the cross-section of the coating produced using TIG current of (a) 90, (b) 110 and (c) 130 A.
Fig. 5
Fig. 5
BSE micrographs obtained from the cross-section of the coatings produced at a TIG current of 110 A.
Fig. 6
Fig. 6
XRD spectra obtained from the coating that was produced using a TIG current of 110 A.
Fig. 7
Fig. 7
OM microstructure of the cross-section of the coating/substrate at TIG currents of (a) 90, (b) 110 and (c) 130 A.
Fig. 8
Fig. 8
Average micro-hardness of the cross-section of the coating/substrate produced using a TIG current of 110 A.
Fig. 9
Fig. 9
EIS Nyquist curves recorded on the bare and coated samples in 1M HCl solution at ambient temperature.
Fig. 10
Fig. 10
Equivalent circuit model for impedance data fitting.
Fig. 11
Fig. 11
Potentiodynamic polarisation curves of bare and coated samples in 1M HCl at ambient temperature.
Fig. 12
Fig. 12
SEM images and EDS analysis of substrate and 110 A samples after 48 h immersion in HCl solution.
See this image and copyright information in PMC

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