Selective dissolution of the γ phase in a binary Ni(γ)/Ni3Al(γ′) two-phase alloy
| Autor: | Dang-Moon Wee, Hye-Youn Lee, Masahiko Demura, Ya Xu, Toshiyuki Hirano |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Materials science
General Chemical Engineering Alloy Inorganic chemistry General Chemistry Aqueous electrolyte engineering.material Corrosion chemistry.chemical_compound chemistry visual_art engineering Aluminium alloy visual_art.visual_art_medium General Materials Science Polarization (electrochemistry) Citric acid Dissolution Electrochemical potential |
| Zdroj: | Corrosion Science. 52:3820-3825 |
| ISSN: | 0010-938X |
| DOI: | 10.1016/j.corsci.2010.07.036 |
| Popis: | Selective dissolution of Ni(γ) in a binary Ni(γ)/Ni 3 Al(γ′) two-phase alloy was performed in an aqueous electrolyte including 1 wt.% (NH 4 ) 2 SO 4 and 1 wt.% citric acid to obtain a rough, γ′-terminated surface. The electrochemical potential for the selective dissolution was determined from the polarization curves of the γ and γ′ single-phase alloys. The selective dissolution tests proved that γ was precisely removed above 1.7 V SCE , resulting in the formation of a rough, γ′-terminated surface. Surface analyses revealed that a passive AlO x , which retarded the dissolution, was preferentially formed on γ′, resulting in a successful selective dissolution. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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