Multifunctional water-based surface tolerant coating and its protective performance

Based on carbon steel surface corrosion,a study was conducted on multifunction acid water-based surface tolerant coatings. The focus was placed on the effect of antirust components and preparation processes on the coating properties. The barrier property was evaluated and compared with imported counterparts. The results show that when the treatment level of the substrate material surface is St1,the adhesive force of the coatings rises at the beginning and then goes downward as the content of the antirust components keeps increasing. The chelating agent contains active groups which stabilize the substrate surface corrosion,resulting in the adhesion performance of the coatings increasing. The compound rust conversion agent improves the coating adhesive force further by translating the corroded substrate surface complexation. The best preparation process needs to mix at low speed and add the compound rust agent at the end of the steps. The adhesive forces of the coatings on the substrate material surfaces treated at St1 and St3 levels show no difference,and they are larger than 5 MPa. The corrosion resisting properties,resistant to salt water for 1200 h,salt spray for1000 h and ultraviolet aging for 2000 h,are much higher than those of similar imported water-based rust primers. The coatings are suitable for the maintenance of complex steel components in atmospheric environment.