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Investigation of passivation and galvanic corrosion of Ti-Nb alloys and pure titanium.

Authors :
Hwang, M.‐J.
Choi, H.‐R.
Kook, M.‐S.
Song, H.‐J.
Park, Y.‐J.
Source :
Materials & Corrosion / Werkstoffe und Korrosion; Aug2015, Vol. 66 Issue 8, p783-789, 7p
Publication Year :
2015

Abstract

The aim of this study was to investigate the role of the passive layers in galvanic corrosion of Ti-Nb alloys and commercially pure titanium (cp-Ti). Ti-Nb alloys with 5, 10, 15, and 20 wt% niobium (Nb) content were prepared using an arc-melting technique under high purity Ar gas. The cp-Ti was used as a control. The electrochemical corrosion behaviors were investigated by A.C. impedance, potentiodynamic polarization, and galvanic corrosion tests. According to the results of impedance analysis, the passivation layer on Ti-Nb alloys consisted of outer, intermediate, inner, and metal defect layers, while the passivation layer on cp-Ti consisted of outer, intermediate, and inner layers. According to the results of anodic polarization tests, Ti-Nb alloys exhibited better zero potentials and reduced zero current densities. The outer layer and the inner layer of Ti-Nb alloys and cp-Ti had an effect mainly on the values of the initial galvanic current density and the sign of galvanic current density, respectively. Ti-10Nb alloy exhibited a relatively high initial galvanic current density compared to the other Ti-Nb alloys. Unlike Ti-5Nb, Ti-10Nb, and Ti-15Nb, which exhibited galvanic current densities with a minus sign, Ti-20Nb exhibited a galvanic current density with a plus sign due to its weaker inner layer than that of Ti. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09475117
Volume :
66
Issue :
8
Database :
Complementary Index
Journal :
Materials & Corrosion / Werkstoffe und Korrosion
Publication Type :
Academic Journal
Accession number :
108698323
Full Text :
https://doi.org/10.1002/maco.201407784