Sol–gel coatings doped with organosilane and cerium to improve the properties of hot-dip galvanized steel

•Tetraethyl orthosilicate sol was roll coated on hot-dip galvanized steels.•Organosilane doping eliminated cracks on tetraethyl orthosilicate coating.•Organosilane doping improved the corrosion resistance of tetraethyl orthosilicate coating.•The hybrid sol–gel doped with cerium salts exhibited self-...

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Bibliographic Details
Published inCorrosion science Vol. 102; pp. 63 - 71
Main Authors Su, Hsiang-Yu, Chen, Pei-Li, Lin, Chao-Sung
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.01.2016
Subjects
EIS
EPMA
Passive films
XPS
Zinc
Passive films
XPS
Zinc
EIS
EPMA
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Summary:•Tetraethyl orthosilicate sol was roll coated on hot-dip galvanized steels.•Organosilane doping eliminated cracks on tetraethyl orthosilicate coating.•Organosilane doping improved the corrosion resistance of tetraethyl orthosilicate coating.•The hybrid sol–gel doped with cerium salts exhibited self-healing capability. An inorganic sol–gel coating and an inorganic/organic hybrid sol–gel coating without and with cerium nitrate were made on hot-dip galvanized steel via a roll coating process. Results showed that the corrosion resistance of the hot-dip galvanized steel was improved with the inorganic coating; however, cracks were present in the coating. Cracks were effectively eliminated and paintability of the sol–gel coating was enhanced while doped with organic precursor. The corrosion resistance and self-healing capability were further enhanced when cerium cation was doped. Finally, the corrosion protection mechanism of the various coatings was discussed in detail.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2015.09.019