1, metal card corrosion protection layer method


The protective method of the metal card anticorrosion layer is the most widely used. The anticorrosion method is to manufacture a protective layer of various materials on the surface of the metal card and isolate the metal card from the corrosive medium of the outside so as to achieve the effect of preventing corrosion. The metal card anti-corrosion protection layer can be formed by painting, spraying, plating, hot plating, spraying, and the like. There are many protective materials for metal card anti-corrosion, common organic oil, paint and other coatings, and non-metallic corrosion-resistant materials such as ceramics and plastics. The anti-corrosion electroplating and hot-dip plating of metal cards generally use non-corrosive metals such as zinc, tin, chromium, and nickel. Another material for metal corrosion protection is an oxide film formed on the surface of steel, that is, a black ferrous oxide film, which can also play a role in corrosion protection.


2. Metal card corrosion protection electrochemical protection method


The electrical protection method for metal card protection is based on the theory of galvanic cells to protect the metal against corrosion. According to the galvanic theory, as long as the reaction of the primary battery that causes chemical corrosion can be eliminated, the metal card can be preserved. The electrochemical protection method of metal card corrosion protection is divided into two categories: anode protection and cathodic protection, in which cathode protection applications are more.


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3, metal card corrosion corrosion media treatment


Metal card corrosion can be achieved through the treatment of corrosive media. This method focuses on the elimination of the presence of corrosive media, which is to keep the metal card dry, for example, often wipe dry the moisture on the machine, prevent the dryer in the precision instrument, and The addition of corrosion inhibitors to the corrosive medium is such an anticorrosion method.