Improvement of Microstructure and Barrier Properties of Silicate Coatings on Low Carbon Steel by Incorporating Colloidal Nano-SiO2

Silicate coatings have been considered as an alternative to toxic and carcinogenic other chemical treatments. In this paper, a strengthened silicate coating was formed on the surface of low carbon steel by dip immersion method. The modification and strengthening was done by loading colloidal nano-Si...

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Bibliographic Details
Published in:Archives of metallurgy and materials 2020-01, Vol.65 (2), p.627-638
Main Authors: Majdi, M.R., Danaee, I., Zaarei, D., Farzam, M.
Format: Article
Language:English
Subjects:
afm
atr-ftir
Carcinogens
Chemical composition
Chemical treatment
Coating effects
colloidal nano-sio2
Colloids
corrosion
Corrosion effects
Corrosion resistance
Corrosion tests
Drying
Electrochemical impedance spectroscopy
Immersion coating
Immersion tests (corrosion)
Low carbon steel
Low carbon steels
Microstructure
Protective coatings
silicate coatings
Silicon dioxide
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Summary:Silicate coatings have been considered as an alternative to toxic and carcinogenic other chemical treatments. In this paper, a strengthened silicate coating was formed on the surface of low carbon steel by dip immersion method. The modification and strengthening was done by loading colloidal nano-SiO2 into the film. The characterizations of nano-SiO2 were investigated by FESEM, TEM and FT-IR. The effects of nano contents (weight ratio) and drying temperatures on corrosion properties of silicate film were studied. Potentiodynamic polarization, electrochemical impedance spectroscopy and immersion tests have been used to study corrosion behavior of nano-loaded silicate films. Surface morphology, microstructure and its chemical composition were analyzed by means of FESEM, EDS, AFM, XRD, GIXRD, ATR-FTIR and Raman techniques. Results indicated that colloidal nano-SiO2 properly modified the silicate coatings and significantly improved the corrosion resistance and barrier property. Also drying temperature showed a considerable effect in silicate coating and higher corrosion resistance was obtained with 150°C curing.
ISSN:2300-1909
1733-3490
2300-1909
DOI:10.24425/amm.2020.132802