Can the used alkaline zincate zinc plating solution be used for alkaline etching of aluminum parts?

[China Aluminum Network] This waste solution can not be used as an alkaline corrosion of aluminum parts, this is because there are zinc in the solution, the surface of the aluminum parts after alkali etching is prone to spots, and in severe cases it will make the entire surface of the workpiece Hair flowers. To use this solution, industrial solutions of sodium sulfide can be used to oxidize the zinc ions released from the solution to precipitate zinc sulfide.

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