Surface segregation and oxidation studies on Cu-Ni-Sn and Ag-Cu-Ge ternary alloys

Surface segregation and oxidation of Cu-9.7at%Ni-2.3at%Sn and Ag-39at%Cu-1.6at%Ge ternary alloys have been carried out employing XPS and AES techniques. Segregation of both Ni and Sn have been observed on the surface of Cu-Ni-Sn alloy. On oxidation of this alloy at 500 K, Cu 2O, NiO and SnO have bee...

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Bibliographic Details
Published in:Applied surface science 1988-10, Vol.35 (1), p.63-75
Main Authors: Sampath Kumar, T.S., Mallya, R.M., Hegde, M.S.
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion mechanisms
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Metals, semimetals and alloys
Metals. Metallurgy
Physics
Specific materials
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Summary:Surface segregation and oxidation of Cu-9.7at%Ni-2.3at%Sn and Ag-39at%Cu-1.6at%Ge ternary alloys have been carried out employing XPS and AES techniques. Segregation of both Ni and Sn have been observed on the surface of Cu-Ni-Sn alloy. On oxidation of this alloy at 500 K, Cu 2O, NiO and SnO have been observed and on heating the oxidized alloy in vacuum to 600 K, Cu 2O was reduced to Cu through a displacement reaction involving Ni. Further heating to 750 K showed only SnO 2 along with the reduction of NiO to Ni. The Ag-Cu-Ge alloy showed segregation of both Ag and Ge to the surface. On oxidation at 500 K, only Cu 2O and GeO have been observed. Heating of the oxidized surface to 700 K in vacuum showed desorption of GeO, coupled with the reduction of Cu 2O to Cu, thereby leaving the alloy surface clean.
ISSN:0169-4332
1873-5584
DOI:10.1016/0169-4332(88)90038-4