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Removal (stripping) of zinc phosphate from steel

Q. What is the best way to remove zinc-phosphate off of hardened steel parts? They cannot be tumbled because of severe tangling problems - they must be immersed in a solution.

Chris Gray
- Somerset, New Jersey

A. Chris -

A. It depends on what type of zinc phosphate is on the parts. If the coating is a stearate type zinc phos, then a good cleaner high in free caustic should do the trick (I personally like KOH based cleaners for this). If it is a deposited zinc phosphate after hardening (i.e. from a metal finisher), then chromic acid is the solution (chromic acid stripping is the standard method used for coating weight analysis).

Hope this gets you going in the right direction.

Dan Brewer
chemical process supplier - Gurnee, Illinois

A. The best way to strip zinc phosphate is chromic acid solution.

Mohanraqj
- Dubai, U.A.E

Q. Hello, How can I strip a coating of zinc phosphate by using sodium hydroxide and sodium gluconate? I mean what ratio of NaOH and sodium gluconate please?

Tarik Errossafi
- Casablanca Morocco
October 23, 2016

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