Effect of laser power on microstructure and corrosion resistance of Ni60A/CeO2 clad layer on TC4 alloy

doi:10.13251/j.issn.0254-6051.2021.08.045

Abstract

Abstract: In order to improve the corrosion resistance of the TC4 alloy substrate surface, Ni60A/CeO₂ composite clad layers were prepared on TC4 alloy substrate surface by laser cladding coaxial powder feeding technology with different laser power of 1200, 1500, 1800, 2100 and 2400 W. The effect of laser power on the corrosion resistance of the clad layer was studied by microstructure examination, electrochemical detection and surface observation after electrochemical corrosion. The results show that with the increase of laser power, the microstructure of clad layer becomes uniform and fine, and the electrochemical characteristics show that the corrosion resistance first increases and then decreases. When the laser power is 2100 W, the maximum electrochemical impedance can reach 25.74 kΩ·cm², and there is no obvious corrosion tunnel on the surface of the clad layer, with most of the corrosion products covering the surface of Ni60A/CeO₂ clad layer, and the corrosion resistance is good.

Key words: laser cladding, Ni60A/CeO₂ clad layer, microstructure, electrochemical corrosion

CLC Number:

TG174.4

Gong Yuling, Wu Meiping, Cui Chen, Li Yang. Effect of laser power on microstructure and corrosion resistance of Ni60A/CeO₂ clad layer on TC4 alloy[J]. Heat Treatment of Metals, 2021, 46(8): 236-240.

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Effect of laser power on microstructure and corrosion resistance of Ni60A/CeO₂ clad layer on TC4 alloy

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