Electrochemical protection engineering of metal pipe installations

Divo G, Liss JL. Variational inequalities in mechanics and physics. Wang Yaodong. Beijing: Science Press, 1987. Electrochemical protection engineering for metal pipe installations There are many ways to prevent corrosion of metal pipes and metal devices. Electrochemical protection is one of them. Corrosion damage in industrial production environments, such as steel pipelines, including water, oil, gas pipelines, heat exchangers, etc., is mostly electrochemical corrosion, and electrochemical protection plays an important role in corrosion control engineering. Electrochemical protection can be divided into cathodic protection and anode protection. Cathodic protection is a protective technique that prevents the surface from being corroded by a sufficient cathode current on the metal surface to polarize the metal surface to become a cathode with uniform potential in the electrochemical cell. Cathodic protection is further divided into sacrificial anode protection and impressed current cathodic protection. Anode protection is to pass a sufficient anode current on the metal surface to move the metal potential in a positive direction to reach and remain in the passivation region, thereby preventing metal corrosion. The anode protection method can be used in a medium capable of forming and holding a protective film.

The cathodic protection method can be used in metal pipelines, devices, heat exchanger oil production platforms, ships, internal and external walls of drilling, etc. in soil, seawater, fresh water and other media, and has the characteristics of economical and effective control of corrosion.

The anode protection method can be used in the environment of sulfuric acid phosphoric acid, ammonia water paper pulp, ammonium hydrogencarbonate, etc., and the protected metal materials are carbon steel, low alloy steel stainless steel, copper aluminum titanium and the like.

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