Corrosion behaviour of laser gas nitrided Ti–6Al–4V in HCl solution |
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| Authors: | R.Sh. Razavi M. Salehi M. Ramazani H.C. Man |
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| Affiliation: | aDepartment of Materials Engineering, Isfahan University of Technology, Isfahan, Iran;bDepartment of Materials Engineering, Sahand University of Technology, Tabriz, Iran;cDepartment of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong |
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| Abstract: | Laser surface nitriding of Ti–6Al–4V alloy was carried out with a Nd:YAG pulsed laser. The microstructure and corrosion behaviour of the nitrided samples were examined, using SEM, XRD, XPS, and anodic polarization tests in 2 M HCl solution. Laser nitriding produced a thin continuous TiN layer followed by TiN dendrites and TiN0.3 needles. The laser nitrided specimen exhibited less corrosion current density, passivated more readily and also, maintained a lower current density over the duration of the experiment. This was correlated with the formation of very thin, continuous TiNxOy film, which could retard chloride ions ingress into the substrate. |
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| Keywords: | A. Titanium B. Polarization B. XPS C. Passive films |
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