Regularities and mechanism of anti-corrosion action of “green” inhibitors in neutral water environments

By-products extracts of the fruit processing act as steel corrosion “pro-inhibitors in a neutral aqueous solution. As a result of the chemical transformation in the volume of the electro­lyte, flavanol-anthocyanin and flavanol-aldehyde adducts are formed, which are adsorbed on the steel surface and block the access of corrosive medium to the metal surface, thereby causing secondary inhibition of the corrosion process. The polymerization pro­ducts have a greater number of carbon atoms in the skeletal structure, located accor­ding to the aromatic scheme, polar and aromatic functional groups. Using quantum chemi­cal methods, it was established that such structures have a better ability to interact with the metal surface through oxygen heteroatoms and due to π-interaction.