Preparation of Barium Europium Phosphate and Its Performance in Acrylic Resin Anti-Corrosion Coating.

Acrylic resin is a polymer with strong crosslinking density and strength, and it is commonly used as a matrix in water-based coatings. Barium europium phosphate (BaEu(PO)) is a novel functional filler that is expected to provide anti-corrosive effects to coatings. In this study, BaEu(PO) was prepared by the high-temperature solid-phase method and applied to acrylic anti-corrosion coatings. The influence of the molar ratio of reactants on BaEu(PO) purity was studied. The anti-corrosion performance of the coating was investigated. It was found that, when BaCO:EuO:(NH)HPO = 3:0.5:3 and the reaction was carried out at 950 °C for 1000 min, high-purity BaEu(PO) can be obtained, according to XRD and EDS tests. SEM shows that BaEu(PO) has good crystal morphology and a porous morphology. TEM revealed that its structure was intact. When BaEu(PO) was added to a relative resin content of 5 wt%, the anti-corrosion performance of the coating was the best after 168 h, with the lowest Tafel current density of 9.616 μA/cm and the largest capacitance arc curvature radius. The salt spray resistance test showed that the corrosion resistance of the 5 wt% BaEu(PO) coating was also the best, which is consistent with the results of the electrochemical test. BaEu(PO) as a pigment and filler can effectively improve the anti-corrosion performance of water-based industrial coatings.