The influence of heat treatment of inorganic conversion coatings produced by sol-gel dip coating on the anticorrosive properties of alumina films deposited on steel substrate – Part I: Single conversion coatings

Boehmite and silica conversion coatings were produced by sol-gel dip coating and heat-treated at different temperatures to improve the anticorrosive performance of alumina film deposited on AISI 1020 carbon steel substrate. SEM and XRD were used to evaluate, respectively, the morphology and composit...

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Bibliographic Details
Published in:Surface & coatings technology 2019-08, Vol.372, p.190-200
Main Authors: Braga, Antonio Vitor de Castro, do Lago, Dalva Cristina Baptista, Pimenta, André Rocha, de Senna, Lilian Ferreira
Format: Article
Language:English
Subjects:
Alumina
Aluminum oxide
Boehmite
Carbon steels
Conversion coating
Conversion coatings
Corrosion prevention
Dip coating
Dip coatings
Electrochemical impedance spectroscopy
Heat treating
Heat treatment
Immersion coating
Morphology
Protective coatings
Silicon dioxide
Sol-gel
Sol-gel processes
Substrates
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Summary:Boehmite and silica conversion coatings were produced by sol-gel dip coating and heat-treated at different temperatures to improve the anticorrosive performance of alumina film deposited on AISI 1020 carbon steel substrate. SEM and XRD were used to evaluate, respectively, the morphology and composition of the conversion coatings. After covering these conversion coatings with alumina film, the systems were characterized by electrochemical impedance spectroscopy. Although both silica and boehmite improved the anticorrosive performance of the alumina film when applied as a conversion coating, the heat treatment temperature used in each case played a decisive role in their properties. •Alumina film was deposited via sol-gel dip coating on inorganic conversion coatings.•Boehmite and silica conversion coatings were heat treated under different temperatures.•The heat treatment influenced on the properties of the conversion coatings.•Anticorrosive properties of the systems are improved by the conversion coatings.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2019.05.040