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Chemical Milling of Cast Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo Alloys in Hydrofluoric-Nitric Acid Solutions
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science. Lulea University of Technology, Sweden.
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2017 (English)In: Corrosion, ISSN 0010-9312, E-ISSN 1938-159X, Vol. 73, no 4, 394-407 p.Article in journal (Refereed) Published
Abstract [en]

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 alpha-laths and the beta-layers in the Widmansttaten 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 alpha-laths compared to the beta-layers, in both alloys. In 1: 3 solutions, higher alpha/beta 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.

Place, publisher, year, edition, pages
NACE International, 2017. Vol. 73, no 4, 394-407 p.
Keyword [en]
atomic force microscopy, chemical milling/pickling, galvanic corrosion, linear polarization resistance, scanning Kelvin probe force microscopy, titanium alloys
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-206265DOI: 10.5006/2277ISI: 000397433600008Scopus ID: 2-s2.0-85020742117OAI: oai:DiVA.org:kth-206265DiVA: diva2:1095263
Funder
The Kempe Foundations, SMK-2546Swedish Foundation for Strategic Research
Note

QC 20170512

Available from: 2017-05-12 Created: 2017-05-12 Last updated: 2017-06-30Bibliographically approved

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