A study of the chemical composition of the passive film on a Ti-Mo alloy in HCl and H{sub 2}SO{sub 4}
Journal Article
·
· Journal of Materials Engineering and Performance
- Beijing Univ. of Chemical Technology (China)
The composition of the passive film on Ti-15Mo alloy, formed in 1 mol/L and 4 mol/L HCl and 2 mol/L H{sub 2}SO{sub 4} solutions at 70 C (160 F) under anodic polarization is investigated by XPS and electrochemical techniques. Anodic polarization potential is found to have an obvious influence on the content of Mo in the film. At lower anodic polarization potentials, the surface of the passive film is enriched in Mo. However, at higher anodic polarization potentials, the surface is diluted in Mo. The anions of the electrolytes influence the composition of the passive film. In HCl solution, chloride ions are incorporated with the passive film during its formation. The passive film consists of a compound containing chloride and oxide ions. While in H{sub 2}SO{sub 4} solution, the passive film only consists of titanium-molybdenum oxide. Sulfide ions and other sulfur are not incorporated. Ti-Mo alloys have a better passivity than pure Ti in HCl and H{sub 2}SO{sub 4} solutions. This passivity is related to the enrichment of Mo in the surface of the passive film.
- OSTI ID:
- 477153
- Journal Information:
- Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 2 Vol. 6; ISSN 1059-9495; ISSN JMEPEG
- Country of Publication:
- United States
- Language:
- English
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