New nanofiller composite coatings with synergistic properties
Researchers report an enhanced corrosion resistance of self-healing waterborne polyurethane coating based on tannic acid modified cerium-montmorillonites composite fillers.
In a recently conducted study, a new composite waterborne polyurethane coating with both self-healing and active corrosion protection was developed for the corrosion protection of carbon steel. The composite coating demonstrated remarkable long-term corrosion resistance thanks to the labyrinth effect of MMT and the synergistic action of corrosion inhibitors Ce3+ and TA.
Long-term anti-corrosion
The impedance modulus was still above 108 Ω·cm2 after 50 days of immersion, which was nearly three orders of magnitude higher than that of the pure PU coating. Moreover, the self-healing experiments confirmed that the physical damage was effectively repaired after heat treatment, which was attributed to the disulfide bond exchange reaction. Importantly, the healed coating also exhibited durable corrosion resistance. According to the researchers, this kind of double functional anti-corrosive coating shows great potential in the field of long-term anti-corrosion.
The study has been published in Progress in Organic Coatings, Volume 178, May 2023.
Reading tip
The EC Tech Report Waterborne Protective Coatings gives you an extensive up-to-date bundle on protective coatings, focusing on water-borne solutions. In addition to technical articles, the Tech Report is rounded off with valuable market insights.
