Effect of nitriding on the electrochemical behaviour of Ti-Al-Mn alloy

The effect of technological conditions of nitriding such as process time duration and chemical composition of saturating medium, on the corrosion behaviour of nitrided coatings in 14 M solution of sulphuric acid was analyzed. The investigations were done on the alloy Ti‐5,0 Al‐2,0 Mn. The nitriding...

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Bibliographic Details
Published in:Materials and corrosion 2005-10, Vol.56 (10), p.697-700
Main Authors: Pohreliuk, I.M., Yaskiv, O.I., Fedirko, V.M., Diuh, I.V.
Format: Article
Language:English
Subjects:
Applied sciences
coatings
Corrosion
Corrosion environments
Corrosion mechanisms
Exact sciences and technology
graphite powder
Heat treatment
Metals. Metallurgy
nitriding
nitrogen
Production techniques
sulphuric acid
Thermochemical treatment and diffusion treatment
Ti-Al-Mn alloy
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Summary:The effect of technological conditions of nitriding such as process time duration and chemical composition of saturating medium, on the corrosion behaviour of nitrided coatings in 14 M solution of sulphuric acid was analyzed. The investigations were done on the alloy Ti‐5,0 Al‐2,0 Mn. The nitriding was carried out in nitrogen both at atmospheric pressure and rarefied nitrogen pressure (1 Pa) at the temperature 850°C and time processing in the range from 5 to 20 h in nitrogen‐containing gas only, and in powder electrode graphite and nitrogen‐containing gas. It was shown that technological conditions of nitriding determine the protective properties of nitrided coatings. It was indicated that the optimal structure of the nitride layer for best corrosion protection is the thin nitride TiNx with high surface quality and a gas‐saturated layer. Nitriding in graphite powder effects positively the protective properties of nitride coatings due to reducing the nitride‐forming process.
ISSN:0947-5117
1521-4176
DOI:10.1002/maco.200503884