The Technical Research Of Gas And Liquid Phase Unites Cathodic Protection

Cathodic protection has been applied as one of the most important anti-corrosion technologies for near upon two hundred year .Bur it is limited in these situations that the electrolytes have continuous phases, such as seawater and soil. To the facilities exposed in the atmospheric environment or the parts of components above water line, the corrosive surroundings consist of disconnected solution film which has high impedance scattering on the metallic surface. So the applied cathodic current can not approach to the total surface. The paper aims at creating a solid electrolytic coating, which is a part of the cathodic protection system serving in the atmospheric environment. The coating is made up with new type resin and electrolyte, which used to form a film that supplies the route of ion during cathodic passing. And make the impressed current reach all the surface of the protected metal. The paper base on experiments to optimize the formulas and technique of the solid electrolytic coating, has great significance and wide application foreground. The conductive coating is used as the auxiliary anode in the atmospheric cathodic protection. The paper mainly studied this kind of conductive coating. The graphite is the conductive material; and the alkyd and acrylate are the film-formers. And the influences of conductive capability are discussed in this paper, such as the amount of graphite , the and thickness of coating. The paper gives the process of the conductive coating and it's influences. We determine the graphite as the reference electrode in the system that the protected metal is cathode and the coating with graphite is anode. We also determine the feasibility of graphite as reference eletrode by a series of test. We combine the reference electrode and anode for the need of structure's simplify and convenience in constructing. And the parameters of gaseous phase cathodic protection must be determined by a series of experiments.