The excessive accumulation of zinc ions is mainly due to too many zinc anodes hanging at ordinary times, and the zinc plate was not taken out of the tank when the production was stopped, especially the nickel-plated iron plate and the zinc plate were hung in the tank at the same time. At this time, due to the large potential difference between the two metals, zinc is used as the anode, and the dissolution speed is faster.
When the zinc ion exceeds the allowable concentration, dense bubbles will appear at the edge of the workpiece. At this time, if the current density is properly reduced, the situation will be improved, but it still cannot completely disappear.