In the plating layer, there will be gaps between the metals, and the potions and additives in the plating bath will remain between the gaps. Since most of the potions are acidic and alkaline, electroplated products will produce some physical properties as the temperature changes when exposed to the air, such as thermal expansion and contraction. It causes residual liquid and additives to be vomited out. The tin layer attached to the electroplating is easily corroded by these substances. It causes surface oxidation and yellowing of the coating.

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