Development of corrosion inhibitors

The commonly used inorganic corrosion retarding pigments mainly include lead pigments, chromate pigments, phosphate pigments and molybdate pigments. Lead pigments and chromate pigments are toxic and do not meet the environmental requirements; Phosphate pigment and molybdate pigment develop rapidly. By changing their particle size, particle distribution and chemical composition, the anticorrosion performance of the bonded coating can be improved effectively. Organic corrosion inhibitors mainly include organic amines, carboxylic acids and heterocyclic compounds. Due to their good compatibility with EP matrix, they can effectively reduce the number of pinholes in the coating. However, at present, a single variety of corrosion inhibitor is increasingly unable to meet the application requirements, and compound corrosion inhibitors (such as inorganic/inorganic corrosion inhibitor composite [5], organic/inorganic corrosion inhibitor composite, etc.) have become the development direction of this research field. Gao Feng [9] synthesized a new inorganic/organic hybrid material (imidazoline laurate - molybdic acid supramolecular compound). The results show that when the PVC value in EP is 30%, the salt resistance time of the bonded coating is more than 200h. When the PVC value is 20%, the salt spray resistance time of the bonded coating is more than 200h. The anticorrosive performance of the adhesive coating even exceeds that of the chrome yellow pigment system with excellent anticorrosive performance. In addition, the application of corrosion inhibitor coated nano-filler technology in adhesive coating has gradually attracted people's attention.