PDA@α-ZrP/SiO2 incorporated phosphate coating with enhanced corrosion resistance and friction resistance.

Abstract

In this study, α-ZrP and SiO2 composite nanomaterials were used to as phosphating accelerators. Experiments show that 2D nanosheets and 0D nanoparticles modified by PDA (PDA@α-ZrP/SiO2) play a synergistic role in effectively increasing the number of phosphate crystals and refining the crystal's size, thereby forming dense and uniform phosphate coatings. The friction resistance and corrosion resistance of phosphate coatings are simultaneously enhanced. Especially when the PDA@α-ZrP/SiO2 addition amount is 0.55 g L-1, the coating porosity of phosphate coating drops from 64.24% to 4.38%. The friction resistance coefficient drops from 0.32 to 0.02 and the polarization resistance increased from 1381 Ω cm2 to 20 520 Ω cm2.