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The most common way to remove the galvanized layer is to remove it with hydrochloric acid pickling, and zinc dissolves very quickly in hydrochloric acid. In order to save costs, in the electroplating factory, the waste acid zinc is removed from the rust of steel.
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Removing the electrogalvanizing layer with hydrochloric acid usually takes only tens of seconds, and hot dipping zinc or spraying zinc is removed, because these two zinc layers are thicker, and the zinc removal time is slightly longer.
Chromic acid wash must be carried out after galvanizing! This is one of the processes of galvanizing. It is to passivate the zinc layer, so that it has better corrosion resistance. The rainbow color on the surface of the galvanized parts we see is the effect of chromic acid pickling.