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Home  > Raw materials & technologies  > Applications  > Protective & Marine coatings  > Studying corrosion protection of mild stee...

Sunday, 15 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Studying corrosion protection of mild steel by sol-gel coating

Thursday, 2 October 2014

Iranian researchers are working on biocompatible anticorrosive coatings with nanometric thickness to increase corrosion resistance in metallic structures.

Anticorrosive chromate coatings are highly toxic and have promoted researchers to look for biocompatible replacements. Source: Alex Fiodorov/Fotolia

Anticorrosive chromate coatings are highly toxic and have promoted researchers to look for biocompatible replacements. Source: Alex Fiodorov/Fotolia

They studied the effects of dipping duration in the silane solution and the sol pH on the protective performance of an eco-friendly silane sol-gel coating consisting a mixture of tetraethoxysilane, methyltriethoxysilane and glycidyloxypropyltrimethoxysilane applied on mild steel substrate using electrochemical techniques and surface analysis.

Coating is able to act as a physical block

In consistency with the data obtained from electrochemical impedance spectroscopy and polarisation curves, electrochemical current noise fluctuation analysis, appearance of the power spectral density plots and noise resistance indicated the most efficient sol pH and immersion time in the silane solution. In this regard, field emission type scanning electron microscopy images and water contact angle values revealed impact of the sol pH on the film structure. The enhancement in protective performance of the hybrid coating resulting from optimum immersion in the silane solution with appropriate pH was connected to the film homogeneity and higher cross linking and thickness as well. Moreover, a good trend correlation was observed between the noise resistance and low-frequency impedance modulus data.

The study is published in: Journal of Sol-Gel Science and Technology, June 2014, Volume 70, Issue 3, pp 329-338.

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