The effects of 5 different tannins on the corrosion resistance of waterborne epoxy resin (EP) were studied.The results showed that the introduction of low concentration tannin (<1.0wt%) was helpful to improve the mechanical properties of EP coatings.Because condensation tannins had stronger “aggregation” effect,they were more likely to form “leakage points” on the EP surface,resulting in poor corrosion resistance of the coating film.The introduction of gallnut tannin improved the corrosion resistance of EP the best,and when the concentration was 0.5wt%,the neutral salt spray resistance time of the coating was up to 528h,and the water resistance time was more than 180d.
Li Chunyin, Li Kun, Zhang Wenwen, Ma Jinju, Liu Yiwen, Chen Chiqing, Lei Fuhou, SunYanlin, Zhang Hong
. Study on the effect of tannin in improving the corrosion resistance of waterborne EP coating[J]. New Chemical Materials, 2021
, 49(2)
: 81
-85
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.02.019
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