Microhardness and corrosion resistance behaviour of Ti–6Al–4V alloy‐coloured surface under WEDM‐HS process. (1st September 2017)

• Record Type: Journal Article
• Authors: Zhang, Linshuai; Xu, Jinkai; Chen, Bingyan; Yu, Huadong; Lian, Zhongxu
• Is Part Of: Micro & nano letters. Volume 12:Number 9(2017)
• Page Start: 618
• Page End: 623
• Publication Date: 2017-09-01
• Subjects: microhardness -- corrosion resistance -- electrical discharge machining -- nanoindentation -- hardness testing -- electrochemical impedance spectroscopy -- thin films -- current density -- surface treatment -- titanium alloys -- aluminium alloys -- vanadium alloys; TiAlV -- titanium alloys -- surface modihcation -- corrosion current density -- electrochemical impedance spectroscopy -- potentiodynamic polarisation -- nanoindentation tester -- high‐speed wire electrical discharge machining technology -- reaction films -- WEDM‐HS process -- alloy‐coloured surface -- corrosion resistance -- microhardness; Nanotechnology -- Periodicals; Nanostructures -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1049/mnl.2017.0037
• Languages: English
• ISSNs: 1750-0443

Abstract

Abstract : In this work, the reaction films were generated on the Ti–6Al–4V alloy by means of high‐speed wire electrical discharge machining (WEDM‐HS) technology in order to improve its microhardness and corrosion resistance. The microhardness was evaluated by using a nanoindentation tester. The corrosion behaviour was studied using measurements of potentiodynamic polarisation and electrochemical impedance spectroscopy. The experimental results showed that the processed alloys presented a higher microhardness than the matrix, and the thicker film on the surface had a greater microhardness. Additionally, the corrosion resistances of the processed alloys were superior, which could have been due to the lower corrosion current densities and the higher impedance values. Furthermore, the corrosion current densities of the processed alloys would decrease with thicker reaction films. This research provides important insights into the surface modification of titanium alloys.