General knowledge of coating: anti-corrosion mechanism of polyaniline coating

Core tip: polyaniline has been discovered more than 100 years ago, but this black-green solid was only used as pigment for a long time, called "aniline black" The discovery of polyaniline anti-corrosion performance has brought new improvement to the coating anti-corrosion performance, especially the conductive polyaniline, which has unique electrochemical properties and can be applied to anti-corrosion, anti fouling, anti-static coating and other fields Polyaniline may play an anti-corrosion role in various states of the coating, which state has better effect and anti-corrosion mechanism need further study With the research Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Paint House News: polyaniline has been discovered more than 100 years ago, but this black-green solid has only been used as a pigment for a long time, known as "aniline black" The discovery of polyaniline anti-corrosion performance has brought new improvement to the coating anti-corrosion performance, especially the conductive polyaniline, which has unique electrochemical properties and can be applied to anti-corrosion, anti fouling, anti-static coating and other fields Polyaniline may play an anti-corrosion role in various states of the coating, which state has better effect and anti-corrosion mechanism need further study With the development of the research, the new anti-corrosion mechanism of polyaniline has been put forward, which mainly includes the following views 1、 The existence of passivation polyaniline leads to the formation of a dense metal oxide film at the interface between the metal and the film, which makes the electrode potential of the metal in the passivation area and protected 2、 Polyaniline with space isolated anode and cathode reaction has a certain charge transfer function, which can intercept electrons on the iron surface and transport them to the outside of the primer, so that a large number of cathode reactions take place there, thus avoiding the occurrence of cathode reactions at the interface of the metal coating, and improving the corrosion resistance of the coating 3、 The ion exchange membrane selectively penetrates and blocks the aggressive anion and anion, and achieves the goal of eliminating the corrosion reaction under the multi-layer synergism 4、 The central atom n of amine organic compounds has a pair of electrons which are not shared When there is an empty D orbit on the metal surface, the lone pair electrons of the central atom of polar group form a coordination bond with the empty D orbit, so that its molecules are adsorbed on the metal surface to form a hydrophobic adsorption layer which plays a role of corrosion inhibition However, polyaniline has poor solubility in most solvents due to its conjugated main chain structure, which hinders its function as an inhibitor 5、 The shielding coating usually has the function of shielding protection, separating the metal surface from the surrounding corrosion environment Polyaniline can form a compact film on the metal surface, improving the compactness of the film, thus having a good anti-corrosion protection effect 6、 The complex polyaniline is formed by the redox reaction at the interface of iron to form a complex The oxidation potential of the complex is higher than that of polyaniline alone, which promotes the reduction of oxygen by catalysis, thus compensating the charge consumed due to the dissolution of iron and stabilizing the electric potential of iron in the passivation area 7、 Polyaniline forms an electric field on the surface of metal under the action of electric field, which is opposite to the direction of electron transfer, thus hindering the transfer of electrons from metal to oxide (oxygen), which is equivalent to an electron transfer shielding effect Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,