What are anodic and cathodic coatings?
According to the electrochemical relationship between the coating metal and the matrix metal, the coating can be divided into anode coating and cathode coating. Under general conditions, when the electrode potential of the coating metal is negative than that of the matrix metal, it is called anode coating, otherwise, it is called cathode coating. What is the protective effect of anode coating and cathode coating on matrix metal? The protective principle of the anode coating is based on the fact that the potential of the coating is negative compared with the matrix metal, and its electrolysis pressure is larger, it becomes the anode in the corrosion cell, thus delaying the corrosion of the matrix metal. Even when the substrate metal is slightly exposed, the coating can still play a protective role, so the number of pores on the anode coating has a small impact on the protective performance, in terms of thickness, the thickness of the coating is larger, the stronger the protection. The negative polarity coating only plays a purely mechanical isolation effect on the matrix metal, without the electrochemical protection effect like the anode coating, so it must be in the case of very little porosity of the coating to have a protective effect, otherwise, in the pores or damage of the coating, the matrix metal will act as the anode of the corrosion battery, accelerating the corrosion of the matrix metal. Generally, the porosity of the coating decreases with the increase of the coating thickness, so the greater the thickness, the stronger the protective performance of the cathode coating.
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