① In the electrolyte without additives, as the cathode current density increases, the coating will crystallize and become rough;

② When the cathode is not moving or stirring, excessive cathode current density will make the coating dark and rough;

③ Depending on the content of zinc ions, too high a cathode current density will cause local burning of the parts.

Solution: Depending on the zinc ion content in the electrolyte, we can control the cathode current density within the range of 1~2.5A/dm².

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