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Selection principle of electroplating anode

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When the anode dissolves normally, most of them generate low-valent steady-state metal ions. If the anode can dissolve the main metal cations in the plating bath, soluble anodes are generally used, but the purity of anode metal materials is high; If the anode normally dissolved cations are not the main metal ions in the plating bath, they are often harmful to the plating bath. For this reason, there are generally two choices: 1. What is needed is a high valence cation, which can make the anode hyperpolarized (using higher anode current density), such as alkaline tin plating; 2. Insoluble anodes (such as hexavalent chromium plating) are used, and the main metal ions are obtained by supplementing the main salt, so the purity of such anodes is relatively lower.< P > The ideal anode should meet the following conditions:
1. No harmful impurities are produced during anodic dissolution;
2. The anode dissolves evenly and produces less sludge;
3. It has high limit current and is not easy to passivate (except chrome plating and tin plating);
4. High current efficiency;
5. Good electrical conductivity and mechanical properties< p >--to be continued

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