Corrosive-wear and Electrochemical Performance of Laser Thermal Sprayed Co₃₀Cr₈W_1.6C₃Ni_1.4Si Coating on Ti6Al4V Alloy

Abstract

Co₃₀Cr₈W_1.6C₃Ni_1.4Si coatings were fabricated on Ti6Al4V alloy using a laser thermal spraying (LTS). The surface and cross-section morphologies, phases and bonding strength of obtained coatings were investigated using scanning electronic microscopy (SEM), X-ray diffraction (XRD), and scratch test, respectively. The effects of laser power on the coefficients of friction (COFs) and corrosive-wear behaviors of Co₃₀Cr₈W_1.6C₃Ni_1.4Si coatings were investigated using a wear tester in 3.5% NaCl solution, and the electrochemical corrosion performance was analyzed using an electrochemical workstation. The experimental results show that the Co₃₀Cr₈W_1.6C₃Ni_1.4Si coating is bonded with the substrate in the metallurgical form, and the bonding strengths of Co₃₀Cr₈W_1.6C₃Ni_1.4Si coatings fabricated at the laser power of 1 000, 1 200, and 1 400 W are 76.5, 56.5, and 55.6 N, respectively. The average COFs of Co₃₀Cr₈W_1.6C₃Ni_1.4Si coatings fabricated at the laser power of 1 000, 1 200, and 1 400 W are 0.769, 0.893, and 0.941, respectively; and the corresponding wear rates are 0.267 × 10⁵, 0.3 1 78 × 10⁵, and 0.325 × 10⁵ µm /Nm, respectively, which increases with the increase of laser power, the wear mechanism is primarily abrasive wear. The corrosion potential of Co₃₀Cr₈W_1.6C₃Ni_1.4Si coatings fabricated at the laser power of 1 000, 1 200, and 1 400 W is −0.05, −0.25, and −0.31 V, respectively, higher than −0.45 V of substrate which enhances the electrochemical corrosion resistance of substrate.

Keywords

laser thermal spraying (LTS) / laser power / Co₃₀Cr₈W_1.6C₃Ni_1.4Si coating / corrosive wear / electrochemical corrosion

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