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Oxidation and corrosion protection by halide treatment of powder metallurgy Ti and Ti6Al4V alloy

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URI: https://hdl.handle.net/10016/20292
ISSN: 0010-938X
DOI: 10.1016/j.corsci.2014.07.037
UXXI: AR/0000015732
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oxidation_CS_2014_ps.pdf (2.06 MB)
Publication date
2014-11-01
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Authors
Tsipas, Sophia Alexandra
Gordo Odériz, Elena
Jiménez Morales, Antonia
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Elsevier
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Abstract
The aim of this work is to study the effect of halide treatment in powder metallurgy Ti-6Al-4V alloy, in order to improve high temperature oxidation and electrochemical corrosion resistance. Halide treatment was performed by immersing samples in a powder mixture containing 3 wt% NH4Cl, at 200 degrees C and 950 degrees C. Oxidation resistance was assessed by exposure to 600 degrees C for 300 h. The microstructure and phase constitution of the formed oxide layers was characterized. Corrosion resistance in aircraft simulated environment was evaluated with electrochemical impedance spectroscopy. Notable improvement in oxidation and corrosion resistance was observed for samples treated at 200 degrees C.
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Keywords
Titanium, EIS, Thermodynamic diagrams, Atmospheric corrosion, Selective oxidation, Oxide coatings
Bibliographic citation
Corrosion Science, vol. 88 (Nov. 2014), pp. 263-274
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