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Corrosion behaviour of triode plasma diffusion treated and PVD TiN-coated Ti–6Al–4V in acidified aqueous chloride environments

2015; Elsevier BV; Volume: 280; Linguagem: Inglês

10.1016/j.surfcoat.2015.08.040

1879-3347

Anthony Scerri, Joseph Buhagiar, S. Banfield, J.C. Avelar-Batista Wilson, J. Housden, A. Leyland, A. Matthews, Glenn Cassar,

Hydrogen embrittlement and corrosion behaviors in metals

The corrosion resistance of triode plasma-nitrided and oxynitrided Ti–6Al–4V was investigated in a hydrochloric acid solution using potentiodynamic polarisation, cyclic voltammetry, and immersion testing at OCP. The untreated and the PVD TiN-coated alloy were used as benchmarks. When compared to the untreated alloy and a PVD-TiN coating, the diffusion treated alloys proved to be more durable due to the presence of a Ti2N compound layer. The corrosion barrier properties of the nitrided alloy depend on both thickness and integrity of the nitride compound layer; the thicker the layer, the better the performance in these tests.