Corrosion behavior of Al0.4CoCu0.6NiSi0.2Ti0.25 high-entropy alloy coating via 3D printing laser cladding in a sulphur environment

doi:10.1016/j.jmst.2020.07.001

Abstract

Abstract:

High-entropy alloys (HEAs) are of great interest in materials science and engineering communities owing to their unique phase structure. HEAs are constructed with five or more principal alloying elements in equimolar or near-equimolar ratios. Therefore, they can derive their performance from multiple principal elements rather than a single element. In this work, three-dimensional printing laser cladding was applied to produce an Al_0.4CoCu_0.6NiSi_0.2Ti_0.25 HEA coating. The experimental results confirmed that the laser cladding could be used to produce a thin coating of 120 μm in thickness. In the high-temperature laser cladding process, some Fe elements diffused from the substrate to the coating, forming a combination of face-centred cubic and body-centred cubic phase structures. The HEA coating metallurgically bonded well with the substrate. Owing to the increased dislocation density and number of grain boundaries, the HEA coating was harder and had a stronger hydrophobicity than X70 steel. The electrochemistry results showed that the HEA coating had better corrosion resistance than X70 steel. Aluminium oxides formed on the surface of the HEA coating had a certain protective effect. However, because of the laser cladding, the HEA coating generated cracks. In future work, the laser cladding technology will be improved and heat treatment will be implemented to prevent formation of cracks.

Key words: High-entropy alloy coating (HEA coating), Laser cladding, Corrosion behaviour

Hongxia Wan, Dongdong Song, Xiaolei Shi, Yong Cai, Tingting Li, Changfeng Chen. Corrosion behavior of Al_0.4CoCu_0.6NiSi_0.2Ti_0.25 high-entropy alloy coating via 3D printing laser cladding in a sulphur environment[J]. J. Mater. Sci. Technol., 2021, 60: 197-205.

Figures/Tables 11

Fig. 1. The Vickers microhardness of the HEA coating.

Fig. 2. XRD pattern of AlSiCoNiCuTi HEA coating.

Fig. 3. The map scanning of the HEA coating (a) the matrix; (b) map scanning of the matrix; (c) map scanning of Al; (d) map scanning of Si; (e) map scanning of Ti; (f) map scanning of Fe; (g) map scanning of Co; (h) map scanning of Ni; (i) map scanning of Cu.

Fig. 4. The section of the HEA coating and energy spectrum analysis by line sweep.

Fig. 5. The Nyquist (a) and Bode (b) plots for the HEA coating and X70 steel.

Fig. 6. Equivalent circuit of EIS plots (a) HEA coating, (b) X70.

Table 1 EIS fitting results of HEA coating and X70 steel.

	R_s(Ω cm^-2)	(CPE-Y₀) _f (Ω^-1.s^n. cm^-2)	(CPE-n) _f	R_f(Ω cm^-2)	(CPE-Y₀) _dl (Ω^-1.s^n. cm^-2)	(CPE-n) _dl	R_ct(Ω cm^-2)
HEA coating	7.242	0.0001986	0.7384	116.4	0.000141	0.8937	3752
X70 steel	6.305	0.0002854	0.9186	6.893	0.0003847	0.9119	627

Fig. 7. Polarization curves and the wettability of the HEA coating and X70 steel.

Table 2 Corrosion potential and current density of the HEA coating and X70 steel.

	HEA coating	X70 steel
E_corr (V_vs SCE)	-0.506	-0.625
I_corr (A/cm²)	2.14 × 10^-5	3.98 × 10^-5

Fig. 8. (a1) Corrosion morphology and (a2)(a3) line scan analysis of the AlSiCoNiCuTi HEA coating with corrosion products; (b1) corrosion morphology and (b2,b3) line scan analysis after being immersed in the 4%NaCl + Na2S2O3 solution for 7 days.

Fig. 9. The corrosion morphology of HEA coating after immersion 14 days in the 4%NaCl+102mol/L Na2S2O3 solution (a) with corrosion products, (b) remove the corrosion products,(c) cross-section morphology of HEA coating and (d) EDS analysis of the pitting.

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