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24. Oct 2022 | Application Areas

Protective sol–gel films modified with tannin extracts

In a present work, tannins extracted from tamarind shells using water and ethyl acetate were introduced into fabricated sol–gel containing 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetraethoxysilane (TEOS) which were subsequently assembled over mild steel surface.
A tamarind fruit on the tree.
The tannins for the study were extracted from tamarind shells. 
Image source: ambadysasi - Pixabay (symbol image).

The result of electrochemical studies revealed that the maximum inhibition efficiency achieved at 1000 ppm was up to 90%. With regards to FTIR spectra, the infrared bands at −1046 and −935 cm1 confirmed the formation of (Si–O–Si) and (Fe–O–Si) covalent bonds.

Enhanced protection ability

The presence of this peak indicates the formation of networks between the mild steel substrate and silicate. According to the researchers, their study has revealed that tannins doped GPTMS-TEOS silanol matrix enhanced the protection ability by promoting crosslinking reactions of the coatings compared to undoped coatings to a significant extent.

The study has been published in Journal of Sol-Gel Science and Technology, Volume 104, October 2022.

EC Techb Report Sustainability


EC Tech Report Sustainability

Making coating systems more environmentally compatible is a burning issue for everyone in the industry, and one that is being fuelled by the European Green Deal. Learn all you need to know about sustainable coatings, how to produce coatings in a more environmentally friendly way and how to give coated products a longer service life. You will find an overview in the EC Tech Report of the many various approaches being adopted. We will dive deep into the European Green Deal, its key points and main purpose as well as consequences for the coating industry, see which new raw materials are being developed to replace or lower the content of products in the SVHC group and learn about different approaches to sustainable paint formulation.

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