Microstructure, corrosive-wear and electrochemical performance of laser cladded NiTi–xAl₂O₃ coatings in 3.5%NaCl solution

Abstract

Purpose

The aim of this study is to investigate the effects of Al₂O₃ mass fraction on the corrosive-wear and electrochemical performance of NiTi coating in 3.5% NaCl solution.

Design/methodology/approach

The NiTi–xAl₂O₃ coatings were fabricated on S355 steel by laser cladding, and their corrosive-wear and electrochemical performance were investigated using a wear tester and electrochemical workstation, respectively.

Findings

The wear rates of NiTi–5%Al₂O₃, –10%Al₂O₃ and –15%Al₂O₃ coatings are 82.33, 54.23 and 30.10 µm³ mm⁻¹ N⁻¹, respectively, showing that the wear resistance of NiTi–15%Al₂O₃ coating is the best. The wear mechanism is abrasive wear, which is attributed to the increase of coating hardness by the Al₂O₃ addition. The polarization resistance of NiTi–5%Al₂O₃, –10%Al₂O₃ and –15%Al₂O₃ coatings is 3,639, 5,125 and 10,024 O cm², respectively, exhibiting that the NiTi–15% Al₂O₃ coating has the best corrosion resistance.

Originality/value

The roles of Al₂O₃ in the corrosive-wear and electrochemical performance of NiTi–xAl₂O₃ coating were revealed through the experimental investigation.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-02-2024-0044/

Citation

Chenglong, Y. and Dejun, K. (2024), "Microstructure, corrosive-wear and electrochemical performance of laser cladded NiTi–xAl₂O₃ coatings in 3.5%NaCl solution", Industrial Lubrication and Tribology, Vol. 76 No. 5, pp. 726-733. https://doi.org/10.1108/ILT-02-2024-0044