Zinc tannate and magnesium tannate as anticorrosion pigments in epoxy paint formulations

[Display omitted] •Pigments were synthetized by the reaction of tannin with zinc and magnesium salts.•Zinc tannate is an excellent anticorrosive pigment in neutral saline media.•Zinc and magnesium tannates have poor anticorrosive properties in acidic media.•Zinc tannate pigment is an environmentally...

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Bibliographic Details
Published in:Progress in organic coatings 2018-08, Vol.121, p.23-29
Main Authors: Zmozinski, Ariane V., Peres, Rafael S., Freiberger, Kelly, Ferreira, Carlos A., Tamborim, Silvia Margonei Mesquita, Azambuja, Denise S.
Format: Article
Language:English
Subjects:
Black wattle tannin
Corrosion
Corrosion prevention
Corrosion tests
Electrochemical impedance spectroscopy
Flowers
Formulations
Fourier transforms
Infrared analysis
Leaves
Magnesium
Magnesium tannate
Organic coatings
Pigments
Polyphenols
Protective coatings
Salt spray tests
Seeds
Solubility
Tannins
Thermogravimetric analysis
Vegetable tannins
Wattle
Zinc
Zinc tannate
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Summary:[Display omitted] •Pigments were synthetized by the reaction of tannin with zinc and magnesium salts.•Zinc tannate is an excellent anticorrosive pigment in neutral saline media.•Zinc and magnesium tannates have poor anticorrosive properties in acidic media.•Zinc tannate pigment is an environmentally friendly option for anticorrosive coatings. Vegetable tannins are natural, non-toxic, water-soluble polyphenols present in the roots, branches, leaves, flowers, fruits, and seeds of various trees. Tannins can remove rust and inhibit corrosion. Because the high solubility of tannins in water may impair their use as an anticorrosion pigment, a reduction in solubility is necessary. In this work, two tannin-based anticorrosive pigments were synthetized by the reaction of black wattle tannin with zinc and magnesium salts to form zinc tannate and magnesium tannate, respectively. Pigment synthesis was verified by thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR). Epoxy coatings containing both tannates were formulated and their corrosion performance was evaluated using electrochemical impedance spectroscopy (EIS) and salt spray tests. Corrosion tests showed that zinc tannate was an excellent anticorrosive pigment in neutral saline media making it an environmentally friendly option for anticorrosive coatings.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2018.04.007