Corrosion resistance properties of plasma nitrided Ti-6Al-4V alloy in nitric acid solutions

被引：62
|
作者：
Fossati, A [1 ]
Borgioli, F [1 ]
Galvanetto, E [1 ]
Bacci, T [1 ]
机构：
[1] Univ Florence, Dip Ingn Civile, I-50139 Florence, Italy
来源：
CORROSION SCIENCE | 2004年 / 46卷 / 04期
关键词：
acid corrosion; polarisation; cyclic voltammetry; titanium nitride; glow discharge nitriding;
D O I：
10.1016/S0010-938X(03)00188-4
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The corrosion resistance of plasma nitrided Ti-6Al-4V titanium alloy in nitric acid solutions was investigated using polarisation curves, cyclic voltammetry, XRD analysis and surface microhardness. For comparison, untreated alloy samples were tested under the same conditions. While the untreated alloy shows a passive behaviour, the compound layer obtained by glow-discharge nitriding treatment, which is composed of an outer TiN and an inner Ti2N layer, shows a high electrochemical inertia; however, if the polarisation potential is higher than a threshold or the period of immersion in high oxidising acid solution is sufficiently long, then the compound surface layer will be attacked and removed with corrosion rate higher than in the case of the untreated Ti-6Al-4V alloy. The corrosion resistance of Ti2N layer results higher in comparison with that of TiN layer. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码：917 / 927
页数：11
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