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

Zhou Weitong (Changzhou University, Changzhou, China)
Kong Dejun (Changzhou University, Changzhou, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 16 August 2019

Issue publication date: 22 August 2019

Abstract

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 × 10−4, 1.10 × 10−4 and 1.30 × 10−4 mm3·N–1·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 × 105 Ω·cm2, higher than 2.193 × 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.

Keywords

Citation

Weitong, Z. and Dejun, K. (2019), "Corrosive wear and electrochemical corrosion behaviors of laser thermal sprayed CoCrAlYTaSi coatings in 3.5 Wt.% NaCl solution", Anti-Corrosion Methods and Materials, Vol. 66 No. 5, pp. 537-543. https://doi.org/10.1108/ACMM-03-2019-2086

Publisher

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Emerald Publishing Limited

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