Materials and Corrosion - Werkstoffe und Korrosion, volume 66, issue 5, pages 472-478
Effect of artificial aging conditions on corrosion resistance of a TiNi alloy
Daniela Ionita
1
,
M Caposi
1
,
I. Demetrescu
1
,
S. Ciuca
2
,
I A Gherghescu
2
Publication type: Journal Article
Publication date: 2014-03-06
scimago Q2
SJR: 0.429
CiteScore: 3.7
Impact factor: 1.6
ISSN: 09475117, 15214176
Materials Chemistry
Metals and Alloys
Surfaces, Coatings and Films
Mechanical Engineering
Mechanics of Materials
Environmental Chemistry
Abstract
The present paper is focused on three different aging treatment of a TiNi alloy in order to enhance corrosion resistance in oral cavity environment. The best corrosion resistance in artificial saliva after aging treatment was found in the case of sample which was heat treated at 700 °C/20 min/water cooled, followed by aging at 400 °C/1.5 h/water cooled. Subsequent to such a heat treatment, the EDX surface analysis indicated an increase of Ti content of the matrix. This effect is in connection with stable and metastable precipitates which appear during the aging. Also, based on the greater affinity to oxygen of Ti compared to Ni, a uniform Ti based oxide layer is predominant explaining the better electrochemical stability. The obtained precipitates morphology is also an important factor in the corrosion behavior.
Found
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