Tamarind shell tannin-doped sol–gel coatings

Researchers have presented novel sol–gel coatings with improved corrosion protectionon of mild steel in acidic medium.

A tamarind fruit on the tree.
The endosperm of tamarind kernels is used to produce tamarind kernel powder Image source: ambadysasi - Pixabay (symbol image).

A new study investigated the application of tamarind shell tannin extracts (TSTE) [isolated using methanol (TME) and 70% acetone (TAE)]-doped hybrid sol–gel coatings prepared using (3-Glycidyloxypropyl)trimethoxysilane (GPTMS) and tetraethoxysilane (TEOS) in 0.5 M HCl solution.

Improved corrosion protection

Electrochemical measurements showed that the mixture of doped TME and TAE hybrid sol–gel coating resulted in higher corrosion resistance. The corrosion inhibition efficiency (CE) was CETME = 94.02% and CETAE = 91.35%, respectively. The Tafel slopes revealed a mixed form of corrosion protection with the main effect at cathodic sites. The higher corrosion inhibition capability of the coating matrix corroborates to higher water contact angle values. SEM analysis revealed coatings’ improved corrosion protection due to the doping’s enhanced inhibitive performance.

The study has been published in Journal of Coatings Technology and Research Volume 19, 2022.

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