2 Cover the metal surface with a protective layer. For example, a metal surface is painted, plated, or chemically formed into a dense corrosion-resistant oxide film or the like.
3 electrochemical protection method. Since the metal element cannot obtain electrons, as long as the protected metal is used as a cathode of the reduction reaction of the electrochemical device, the primary battery reaction causing the electrochemical corrosion of the metal can be eliminated. Specific methods are: a. Cathodic protection method with applied current. The electrolyzed device is used to connect the protected metal to the negative electrode of the power source, and the inert electrode is used as the anode. As long as the applied voltage is sufficiently strong, the protected metal can be prevented from being corroded. b. Cathodic protection of sacrificial anodes. With the galvanic cell device, the protected metal is combined with another metal that is more electron-relaxing to form a new galvanic cell. When the primary battery reacts, the original metal is used as the positive electrode (ie, the cathode) and is protected. The corroded is the active metal - the negative electrode (ie, the anode). In addition, there are methods such as adding corrosion inhibitors to slow down or prevent corrosion of metals.
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