Not all metal ions can be precipitated from aqueous solutions. If the side reaction of reducing hydrogen ions to hydrogen dominates the cathode, it will be difficult for metal ions to precipitate on the cathode. According to experiments, the possibility of electrodeposition of metal ions from aqueous solutions , certain rules can be obtained from the periodic table of elements Anodes are divided into soluble anodes and insoluble anodes. Most anodes are soluble anodes corresponding to the coating. For example, zinc plating is a zinc anode, silver plating is a silver anode, and tin-lead alloy plating uses a tin-lead alloy anode. But a few electroplating due to the difficulty in dissolving the anode, insoluble anodes are used. The main salt ions of the plating solution are supplemented by adding a prepared standard gold-containing solution. Chrome plating anodes use pure lead, lead-tin Alloys, lead-antimony alloys, etc. do not source orange shirt soluble anodes.

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