Method for preparing novel conductive composite anticorrosive coating

Abstract

The invention relates to a method for preparing a novel conductive polypyrrole / polyaniline composite anticorrosive coating. The method comprises the following steps of: dissolving p-toluenesulfonic acid into water, regulating the pH value of a solution to be an appropriate value, and adding pyrrole and aniline monomers to obtain a mixed solution; performing electrochemical synthesis by using a three-electrode system, wherein copper is taken as a working electrode, a platinum sheet is taken as an auxiliary electrode, and a reference electrode is a saturated calomel electrode; and performing electrochemical polymerization under certain electrical parameters by cyclic voltammetry to obtain a layer of conductive polypyrrole / polyaniline composite anticorrosive coating on the surface of the copper electrode. The conductive polymer coating generated on the surface of the copper has high adhesion and is uniform and compact; medium corrosion ions can be effectively hindered from penetrating the coating and permeating into the surface of a metal matrix for a long time; the composite coating effectively improves the corrosion potential of a copper matrix and reduces corrosion current; and in addition, after the prepared coating is damaged, a layer of passivating film can be quickly generated on the surface of the matrix so as to ensure that metal is free of corrosion.

Description

technical field [0001] The invention relates to a preparation method of a novel conductive composite anticorrosion coating, which belongs to the field of surface anticorrosion. Background technique [0002] With the gradual depletion of the three major fossil energy sources, energy issues have been receiving much attention in recent years, and the development of clean, efficient and sustainable new energy sources has become the trend of the situation. Proton exchange membrane fuel cell (PEMFC) has become a research hotspot because of its high energy conversion rate; low temperature fast start; environment friendly, zero emission; small size, easy to carry and so on. The bipolar plate is a key component for connecting PEMFC single cells in series to form a battery stack, which requires high electrical and thermal conductivity, good corrosion resistance and low cost. Metal materials have become the first choice, but the main challenge it faces is corrosion, which leads to a d...

AI Technical Summary

Problems solved by technology

[0004] However, due to the rigidity of the chain and the strong interaction between the chains, the polypyrrole and polyaniline coatings prepared separately have the disadvantages of poor solubility and difficult processing, which limits their wide application in technology.

At the same time, the polyaniline and polypyrrole film structure will be destroyed during the battery cycle charge and discharge process, resulting in a decrease in efficiency.

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