Relationship of Corrosion Behavior Between Single-Phase Equiatomic CoCrNi, CoCrNiFe, CoCrNiFeMn Alloys and Their Constituents in NaCl Solution

doi:10.1007/s40195-021-01281-7

Abstract

Abstract:

The composition is a significant issue for corrosion resistance of metallic materials. To reveal the correlation of corrosion behavior between multiprinciple alloys and their constituents, a series of single-phase equiatomic alloys of CoCrNi, CoCrNiFe and CoCrNiFeMn was fabricated. The electrochemical and scanning electron microscope results demonstrated that corrosion resistance of the equiatomic alloys in 0.1 M NaCl solution is located in the range but not the average value of their constituents. X-ray photoelectron spectroscopy analysis indicated that the protective performance of passive film is mainly determined by the constituent with the highest corrosion resistance and the breakdown of passive film is mainly dominated by the elements with the highest corrosion rate. Our findings can guide the materials design of multiprinciple alloys with expected corrosion performance.

Key words: High-entropy alloy, Corrosion, Constituent, X-ray photoelectron spectroscopy (XPS), Passive films

D. P. Wang, J. W. Shen, Z. Chen, F. G. Chen, P. Y. Guo, Y. X. Geng, Y. X. Wang. Relationship of Corrosion Behavior Between Single-Phase Equiatomic CoCrNi, CoCrNiFe, CoCrNiFeMn Alloys and Their Constituents in NaCl Solution[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(11): 1574-1584.

Figures/Tables 9

Fig. 1 X-ray diffraction patterns of the three equiatomic alloys. The red lines at the bottom of the figure correspond to peaks of the face-centered cubic phase of crystalline Ni

Fig. 2 a-c Backscattered electron images of the microstructure of the CoCrNi, CoCrNiFe and CoCrNiFeMn equiatomic alloys. d Composition maps for the CoCrNiFe sample, corresponding to the same position in b

Fig. 3 Open-circuit potential curves of the equiatomic alloys and their constituents in 0.1 M NaCl solution: a CoCrNi, b CoCrNiFe, c CoCrNiFeMn. The dotted line is the average value of the open-circuit potential of the constituents

Fig. 4 Potentiodynamic polarization curves of the equiatomic alloys and their constituents in 0.1 M NaCl solution: a CoCrNi, b CoCrNiFe, c CoCrNiFeMn, d Potentiodynamic polarization curves of the three equiatomic alloys in 0.1 M NaCl solution

Fig. 5 Statistical analysis of the electrochemical parameters: a corrosion current density, b critical potential. The symbols of the star represent the value of the equiatomic alloys and the dotted lines demonstrate the average value of the corresponding constituents

Fig. 6 Surface morphologies of the samples after immersion in 0.1 M NaCl solution for 36 h: a-e elements of Ni, Co, Cr, Fe and Mn, f-h equiatomic alloys of CoCrNi, CoCrNiFe and CoCrNiFeMn. Typical corrosion pits are labeled with dotted cycles

Fig. 7 a-e High-resolution XPS spectra of the metallic elements of Co, Cr, Ni, Fe and Mn in the passive film formed on the CoCrNiFeMn equiatomic alloy after immersion in 0.1 M NaCl solution for 12 h, f High-resolution XPS spectra of the oxygen in the passive film formed on the CoCrNiFeMn equiatomic alloy

Fig. 8 Depth profiles of metallic elements and oxygen in the passive film and interface regions of the equiatomic alloys after immersion in 0.1 M NaCl solution for 12 h: a CoCrNi, b CoCrNiFe, c CoCrNiFeMn. The dotted line is the nominal composition and the hollow symbols show the detected composition from EDS

Fig. 9 Fractions of the metallic elements in the passive film a and the interface regions b of the equiatomic alloys after immersion in 0.1 M NaCl solution for 12 h

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