Abstract
Calcium tannate was synthesized, characterized, and dispersed into an epoxy coating as an inhibitive pigment. Electrochemical Impedance Spectroscopy
(EIS) was employed to monitor the anti-corrosive performance of the
coating formulated with the as-prepared pigment after exposure to the
salt spray chamber. Reference coatings with the commercial calcium phosphate
pigment and unpigmented coating were also evaluated for comparison
reasons. EIS results showed that epoxy coating pigmented with calcium
tannate has higher coating impedance after 21 days of exposure compared
with reference coatings, either unpigmented or calcium phosphate
pigmented coatings. XPS analysis was employed for a deeper understanding of the inhibitive action of calcium tannate towards corrosion protection
and verified the incorporation of tannate molecules in the protective
film formed on the steel substrate under the calcium tannate pigmented
coating.
Original language | English |
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Journal | Progress in Organic Coatings |
Volume | 167 |
ISSN | 0300-9440 |
DOIs | |
Publication status | Published - 2022 |
Keywords
- Corrosion
- Tannins
- Calcium tannate
- Epoxy coating
- EIS