Anticorrosion composite coating based on silver phosphate/poly-phenylene sulfide with excellent hydrophobicity and antimicrobial properties

Abstract

Combating microbial contamination has been one of the hottest topics in the scientific community. Therefore, antibacterial materials have been rapidly developed and widely used in recent decades. However, developing corrosion-resistant coatings with both hydrophobic and antimicrobial properties remains challenging. This study innovatively mixed polyphenylene sulfide (PPS) resin with Ag3PO4/SiO2 filler, and prepared a hydrophobic antibacterial coating with enhanced corrosion resistance on the tinplate surface through a simple spraying strategy. After testing, the water contact angle of the composite coating is 139.7° ± 1°, and the sliding angle is less than 5° ± 1°. Compared with the pure PPS coating, the corrosion current of the composite coating was reduced by 4 orders of magnitude, with an impedance of 788740 Ω·cm2. After 200 h testing in a salt spray chamber, it still showed excellent corrosion resistance. Excellent hydrophobicity and anti-corrosion properties effectively reduce the adhesion of water, thereby preventing microorganisms from forming biofilms on the coating surface and corroding the substrate. In addition, bacterial tests show that the coating has excellent antibacterial efficacy, effectively inhibiting the reproduction of E. coli and S. aureus, providing a second line of defense to prevent bacteria from adhering to the substrate. Therefore, the multi-faceted characteristics make PPS composite coatings have broad application prospects.