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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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hdl:2117/104324

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Sefer, Birhan
Dobryden, Illia
Almqvist, Nils
Pederson, Robert
Antti, Marta-lena
Document typeArticle
Defense date2017-04-01
Rights accessRestricted access - publisher's policy
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
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.
CitationSefer, B., Dobryden, I., Almqvist, N., Pederson, Robert, Antti, M. Chemical milling of cast Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo alloys in hydrofluoric-nitric acid solutions. "Corrosion", 1 Abril 2017, vol. 73, núm. 4, p. 394-407. 
URIhttp://hdl.handle.net/2117/104324
DOI10.5006/2277
ISSN0010-9312
Publisher versionhttp://corrosionjournal.org/doi/10.5006/2277?code=nace-prem-site
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  • Departament de Ciència dels Materials i Enginyeria Metal·lúrgica - Articles de revista [961]
  • CIEFMA - Centre d'Integritat Estructural, Micromecànica i Fiabilitat dels Materials - Articles de revista [217]
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