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Investigation of passivation and galvanic corrosion of Ti-Nb alloys and pure titanium.
- 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 :
- Academic Search Index
- Journal :
- Materials & Corrosion / Werkstoffe und Korrosion
- Publication Type :
- Academic Journal
- Accession number :
- 108698323
- Full Text :
- https://doi.org/10.1002/maco.201407784