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Self‐healing properties of TiO 2 particle–polymer composite coatings for protection of aluminum alloys against corrosion in seawater
Author(s) -
Yabuki A.,
Urushihara W.,
Kinugasa J.,
Sugano K.
Publication year - 2011
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201005756
Subject(s) - materials science , corrosion , composite number , coating , polymer , composite material , aluminium , artificial seawater , dissolution , polarization (electrochemistry) , conversion coating , seawater , particle (ecology) , chemical engineering , metallurgy , chemistry , oceanography , engineering , geology
TiO 2 particle–polymer composite coatings were applied to the surface of a 5083 aluminum alloy. After using a knife to create an artificial defect, polarization resistance was monitored in artificial seawater at a temperature of 30 °C. The polarization resistance of the specimen coated with the composite polymer containing 3 vol% TiO 2 particles increased significantly over time, suggesting that the composite coating had self‐healing properties. A carbon‐containing 2‐µm thick film was found on the coated aluminum substrate at the site of the artificial defect. The formation of the film was related to the dissolution of bisphenol A (BPA), which is a chemical precursor of the polymer coating that behaved as an inhibiting agent.