Electrochemical corrosion behavior of FeCoCrNiMoBSi high-entropy alloy  coating prepared by laser cladding

doi:10.13251/j.issn.0254-6051.2024.08.044

Abstract

Abstract: FeCoCrNiMoBSi high-entropy alloy (HEA) coating was fabricated on the 316L stainless steel substrate via laser cladding. The microstructure, electrochemical corrosion and immersion corrosion properties of the HEA coating in H₂SO₄ solution were investigated. The results show that the laser clad HEA coating exhibits a bilayer structure, consisting of a columnar crystal at the bottom and an equiaxed crystal at the top. In the 0.3 mol/L H₂SO₄ solution, the self-corrosion potential, self-corrosion current density and polarization resistance of the HEA coating are 0.091 V, 11.499 μA/cm² and 9839.90 Ω, which are 2.12 times, 6.17% and 12.2 times, respectively, of the 316L stainless steel substrate. The HEA coating exhibits larger capacitance arc radius and impedance modulus value. Additionally, in the 50% H₂SO₄ solution, the corrosion rate of the HEA coating is lower, approximately 0.098 mg/(dm²·d), 316L stainless steel substrate shows conspicuous heterogeneous corrosion, whereas the corrosion surface of the HEA coating remains uniformly flat, showing homogeneous corrosion rate. The comprehensive results show that the corrosion resistance of the FeCoCrNiMoBSi high-entropy alloy coating on the 316L stainless steel substrate is significantly better than that of the substrate itself.

Key words: high-entropy alloy coating, laser cladding, electrochemical corrosion

CLC Number:

TG142.1

Du Xinyu, Zhai Changsheng, Rong Haisong, Xie Fang, Zheng Hongxing, Zhang Xi, Zhang Xin, Liu Gang. Electrochemical corrosion behavior of FeCoCrNiMoBSi high-entropy alloy coating prepared by laser cladding[J]. Heat Treatment of Metals, 2024, 49(8): 261-267.

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Electrochemical corrosion behavior of FeCoCrNiMoBSi high-entropy alloy coating prepared by laser cladding

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