ie9b02557_si_001.pdf (661.95 kB)
Waterborne Epoxy Resin/Polydopamine Modified Zirconium Phosphate Nanocomposite for Anticorrosive Coating
journal contribution
posted on 2019-08-23, 20:03 authored by Xinxin Sheng, Ruibin Mo, Yue Ma, Xinya Zhang, Li Zhang, Hua WuReplacing
solvent-based coatings with waterborne resin ones has
become an overall trend in the coating industrial to reduce pollution
caused by volatile organic compounds. It is known that introduction
of flexibly designable two-dimensional nanoplatelets or zirconium
phosphate (ZrP) can improve the mechanical and barrier properties
of a film from solvent-based coatings. In this work, we have designed
a methodology to prepare nanocomposites for waterborne coating, which
consist of waterborne epoxy resin (WER) and polydopamine modified
ZrP (PDA-ZrP). It is found that PDA-ZrP has excellent compatibility
with WER, and consequently, the film defects of pure WER are fixed.
The PDA-ZrP/WER coating exhibits an extremely low corrosion current
(1.09 × 10–9 A cm–2) at 1.0%
PDA-ZrP loading. It is about 500 times lower than that of the pure
WER coating (5.82 × 10–7 A cm–2), and consequently, the same coating has a much smaller rusted area
after a salt spray test of 310 h. It should also be noted that all
materials we used are eco-friendly, and all experimental procedures
are conducted under mild conditions.