Electrochemical Behavior of Chemical Vapor Deposited Protective Aluminum Oxide Coatings on Ti6242 Titanium Alloy
Author(s) -
Grégory Boisier,
Monica Răciulete,
Diane Samélor,
Nadine Pébère,
Alain Gleizes,
Constantin Vahlas
Publication year - 2008
Publication title -
electrochemical and solid-state letters
Language(s) - English
Resource type - Journals
eISSN - 1944-8775
pISSN - 1099-0062
DOI - 10.1149/1.2968109
Subject(s) - materials science , corrosion , amorphous solid , electrochemistry , chemical vapor deposition , alloy , titanium , chemical engineering , polarization (electrochemistry) , aqueous solution , amorphous metal , chloride , aluminium , oxide , metallurgy , inorganic chemistry , chemistry , nanotechnology , electrode , organic chemistry , engineering
International audienceThe electrochemical behavior at room temperature in a neutral sodium chloride aqueous solution of four types of metallorganic chemical vapor deposited aluminum oxide coatings on commercial Ti6242 titanium alloy was investigated. Polarization and electrochemical impedance curves revealed that porosity free, amorphous alumina coatings provide a two order of magnitude improvement of the corrosion resistance with regard to the bare alloy. Crystallized alumina as well as amorphous AlO(OH) only slightly improve the corrosion resistance of Ti6242. It was demonstrated that metallorganic chemical vapor deposition processed amorphous alumina is a highly promising solution to the protection of titanium alloys against corrosion in salt environments
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