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

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...

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Bibliographic Details
Published in:Surface & coatings technology 2015-10, Vol.280, p.185-193
Main Authors: Scerri, A., Buhagiar, J., Banfield, S., Avelar-Batista Wilson, J.C., Housden, J., Leyland, A., Matthews, A., Cassar, G.
Format: Article
Language:English
Subjects:
Chlorides
Coatings
Corrosion
Cyclic voltammetry
Durability
Ion nitriding
Physical vapor deposition
Potentiodynamic polarisation
Titanium
Titanium base alloys
Titanium nitride
Triode plasma nitriding/oxynitriding
Triodes
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Summary: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. •TPN and TiN coated Ti–6Al–4V has a more noble corrosion potential than Ti-alloy.•All diffusion treatments delay corrosion attack of the Ti-alloy substrate.•The corrosion resistance increases with an increase in compound layer thickness.•Ti2N is more corrosion resistant when compared to TiN.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2015.08.040