Título:
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Chemical milling of cast Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo alloys in hydrofluoric-nitric acid solutions
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Autor/a:
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Sefer, Birhan; Dobryden, Illia; Almqvist, Nils; Pederson, Robert; Antti, Marta-lena
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Otros autores:
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Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. CIEFMA - Centre d'Integritat Estructural, Micromecànica i Fiabilitat dels Materials |
Abstract:
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The behavior of cast Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo during chemical milling in hydrofluoric-nitric (HF-HNO3) acid solutions with 1:3 and 1:11 molar ratios was investigated using electrochemical and atomic force microscopy (AFM) techniques. Faster corrosion rate in 1:3 solutions was measured for Ti-6Al-4V than for Ti-6Al-2Sn-4Zr-2Mo, whereas in 1:11 solution Ti-6Al-2Sn-4Zr-2Mo exhibited higher corrosion rate. Scanning Kelvin probe force microscopy measurements revealed difference in the Volta potential between the a-laths and the ß-layers in the Widmansttäten microstructure indicating operation of microgalvanic cells between the microconstituents when in contact with HF-HNO3 solution. The AFM topography measurements demonstrated faster corrosion of the a-laths compared to the ß-layers, in both alloys. In 1:3 solutions, higher a/ß height difference was measured in Ti-6Al-4V, whereas in 1:11 solution, the difference was higher in Ti-6Al-2Sn-4Zr-2Mo. The results revealed that the chemical milling behavior of the two investigated alloys is controlled by the microscopic corrosion behavior of the individual microconstituents. |
Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria dels materials -Atomic force microscopy -Chemical milling -Titanium alloys -Atomic force microscopy -chemical milling/pickling -galvanic corrosion -linear polarization resistance -scanning Kelvin probe force microscopy -titanium alloys -Titani -Corrosió i anticorrosius |
Derechos:
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Tipo de documento:
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Artículo - Versión publicada Artículo |
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