Preparation And Properties Of Anti Corrosion Coatings On Electricity Grounding Grid

The orderly operation of the power grounding is an inevitable requirement to ensure the safety of the personal and the power system. Study on corrosion of grounding equiptment was a major project for the safety of national grid. The grounding device throughout the entire plant, and it is hidden works, once the short circuit occurs, it will lead to the destruction of ground grid, resulting in high-voltage fleeing into the secondary circuit, and expand the development of the accident. With the rapid development of power industry, power companies pay more attention to the grounding safety, Corrosion is the biggest security risk,how to legitimate security solution grounding grid corrosion problems, it is an urgent need to solve the problem of power grid construction.This paper studied the application of polyaniline coatings in corrosion protection technology of grounding grid, Hydrochloride doped polyaniline?PANI-Cl? and lignin sulfonic acid doped polyaniline?PANI-LGS? was prepared by chemical polymerization method. Method of FTIR, UV-Vis, DSC and solubility have been used to study these two kinds of PANIs respectively. The results showed that: The synthesized product is polyaniline and LGS doped valid, The solubility and conductivity of polyaniline are better, Its thermal decomposition temperature up to 344.2?. The PANI coating layer deposited on the wild steel electrode by cyclic voltammetry. The polymer solution was made from 0.3mol· L^-1 Oxalic acid + 0.1mol· L^-1Aniline, at the same time, the sodium tungstate and molybdate doping PANI coating was prepared.PANI-Cl and PANI-LGS was mixed with epoxy resin to prepare five kinds of the anticorrosion coatings. The corrosion resistance of coatings on carbon steel in soil simulated fluid were tested through OCP, Tafel and EIS experimental. The results showed that the anti-corrosion performance of 1% PANI-LGS is more optimal, the impedance value was 1-2orders of magnitude higher at the same time period compared with epoxy, after immersion1120 h, The |Z|_{0.01 HZ} still up to 3.497×10⁷ohm·cm².The corrosion resistance performances of the PANI, PANI-WO₄^2-, PANI-MoO₄^2-coatings on the wild steel were studied comprehensively through the corrosion electrochemical method. Results reveal that PANI coating can protect wild steel from corrosion, while the anti-corrosion performance of PANI coating doped with tungsten acid sodium and molybdic acid is superior to PANI coating, among which the anti-corrosionperformance of PANI coating doped with molybdic acid was optimal. This is due to the doped molybdic acid not only improved the performance of passivation film on the electrode surface,but also increased the density and stability of PANI coating.Finally, Using density functional theory, the quantum chemical calculation of PANI and LGS were carried out in B3LY/6-31g?d? Conditions. The possible anti-corrosion mechanism model of PANI coating has been set up based on the result of experiment and quantum chemical calculations.