Dual-Function Double-Walled Microcapsules Effectively Improve the Wear Resistance and Anticorrosion of Epoxy Composite Coatings
Xin Li, Zhike Li, Hongxin Luo, Nanqi Shi, Shuzhen Dong, Changqing Yu, Haiyan Li
Abstract
In the exploration of new microcapsule self-healing coatings with exceptional abrasion and corrosion resistance, this study focused on employing dual-function polydopamine-modified poly(urea-formaldehyde)/graphene oxide (PUF/GO-PDA) double-walled microcapsules to endow the wear resistance and anticorrosion performance of epoxy resin coatings (EP). The synthesized double-walled microcapsules exhibit a rough surface with a particle size of approximately 68 ± 13 μm. The incorporation of GO-PDA enhanced the adhesion of microcapsules to the EP matrix. Compared to pure epoxy coatings, the coefficient of friction (COF) of epoxy coatings filled with 10 wt % microcapsules decreased from 0.691 to 0.039. The average COF and wear rate were 94.3 and 87.8% lower than that of pure epoxy coatings, respectively, Abrasion depth decreased from 19.923 to 6.102 μm. After a 15-day impregnation period, the impedance value and low-frequency impedance modulus of the scratch coatings were higher than those of the pure epoxy, respectively. The OIL@PUF/GO-EP scratched coatings show a slight decrease in | Z | 0.01 Hz from 1.537 × 10 5 to 2.430 × 10 4 Ω·cm 2 in 1–15 days. This study yields valuable insights into the design and development of dual-function polymer coatings with enhanced tribological properties and anticorrosion.