Corrosive wear and electrochemical corrosion behaviors of laser thermal sprayed CoCrAlYTaSi coatings in 3.5 Wt.% NaCl solution

摘要

Purpose This paper aims to enhance the corrosive wear and electrochemical corrosion of Ti-6Al-4V alloy. Design/methodology/approach A CoCrAlYTaSi alloy coating was fabricated on Ti-6Al-4V alloy using a laser thermal spraying (LTS). The surface and cross-section morphologies, chemical elements, phases and bonding strength of the obtained coating were analyzed using a scanning electron microscope, energy dispersive spectroscope, X-ray diffraction and scratch test, respectively, The corrosive wear and electrochemical corrosion of CoCrAlYTaSi coating in 3.5 Wt.% NaCl solution were investigated using a wear tester and electrochemical workstation, respectively. Findings The average coefficient of frictions (COFs) of CoCrAlYTaSi coating under the wear loads of 2, 4 and 6 N are 1.31, 1.02 and 0.88, respectively; and the corresponding wear rates are 0.66 x 10(-4), 1.10 x 10(-4) and 1.30 x 10(-4) mm(3)center dot N-1 center dot m(-1), respectively. The wear mechanism under the wear load of 2 N is abrasive wear, while those under the wear loads of 4 and 6 N are adhesive wear and abrasive wear. The charge transfer resistance of CoCrAlYTaSi coating is 5.368 x 105 omega center dot cm(2), higher than 2.193 x 105 of the substrate. Originality/value In this study, a CoCrAlYTaSi coating was firstly fabricated on Ti-6Al-4V alloy using a LTS. Its corrosive wear and electrochemical corrosion in 3.5 Wt.% NaCl solution were investigated, which played a protective role of corrosive wear on Ti-6Al-4V alloy.