①Remove iron impurities in the plating solution (galvanizing solution), using potassium permanganate to oxidize divalent iron, generating flocculent iron hydroxide, which is easy to sink and remove.
②Use the oxidizing property of potassium permanganate to accelerate the effect of passivation on the surface of aluminum alloy materials. In the passivation treatment of aluminum and alloy, it can replace hexavalent chromium for golden passivation treatment, and can also be used as an additive for chemical polishing of aluminum and alloy.