Mr. Zheng Ruiting proposed the following methods:
Electrolytic method: Phosphoric acid (density = 1.7g/cm3) 3000mL water 1500mL, sulfuric acid 1000mL, at room temperature, was returned as the anode, the current density of 3 ~ 5A/dm2, electrolytic removal. This method is easy to produce replacement copper after the net is removed, and should be removed in the dilute chromic acid solution after the nickel layer is removed.
Chemical removal methods can also be used:
A potassium pyrophosphate 150g/L, soaked at room temperature.
Method two: ferric chloride 750 ~ 810g / L, soaked at room temperature.
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