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

SURFACE & COATINGS TECHNOLOGY

卷:372

Article

de Castro Braga, Antonio Vitor¹  Baptista do Lago, Dalva Cristina¹  Pimenta, Andre Rocha²  de Senna, Lilian Ferreira¹ 

[1] Univ Estado Rio De Janeiro, Dept Analyt Chem, Lab Electrochem & Corros, Rua Sao Francisco Xavier 524,PHLC,427, BR-20559013 Rio De Janeiro, RJ, Brazil

[2] Fed Inst Educ Sci & Technol Rio de Janeiro, Lab Comp Instrumentat & Simulat, Campus Paracambi,Rua Sebastiao de Lacerda S-N, BR-26600000 Paracambi, RJ, Brazil

关键词: Alumina;    Dip coating;    Sol-gel;    Conversion coating;    Heat treatment;   

DOI  :  10.1016/j.surfcoat.2019.05.040

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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