PDMS-OH modified acrylic polyurethane based self-releasing slippery coatings for corrosion protection applications

Abstract

Slippery coating inspired by the Nepenthes pitcher plant shows hydrophobicity and barrier properties, which has gained great attention in corrosion protection applications. But the most studies on slippery coating have not considered long-lasting anti-corrosion effects and the preparation process is not conducive to engineering applications. In this study, a series of slippery coatings with PDMS nanodomains has been designed by a block-copolymer-based approach and presented stable self-releasing property by un-blocking in the PDMS nanodomains. The self-releasing process has been monitored by In-situ Raman and polarized light microscopy. The maximum sliding angle difference for Si-AP/25 % reaches 17.23° when releasing lubricant layer. In addition, the corrosion resistance property of the coatings has been investigated in 0.1 M HCl, 1 M NaOH media, and 3.5 wt% NaCl solution. The Si-AP/20 % coating shows the best resistance performance in all conditions. The characteristic impedance @ 0.01 Hz is 1.88 × 1010 Ω·cm2 after 150 d immersion in 3.5 wt% NaCl solution. The continuous releasing of microdroplets forms a stable lubricant layer on the prepared coating, which contributes to the superior slippery and corrosion resistance performance. The detailed mechanism is discussed in the paper.