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Stripping zinc phosphate

Question: We have pieces with zinc phosphate that need rework. What acid is needed, sulfuric or hydrocloridric?

Cesar Lopez
- Mexico
2005

Dear Mr. Lopez,

If the substrate is steel, You can use the following solution to strip the phosphate coating on it:

Concentrated hydrochloric acid containing 20 g/l of antimony trioxide,

This solution is very effective in removing the phosphate coating on steel and at the same time prevents the attack of the base metal.

T.S.N. Sankara Narayanan
- Chennai, Tamilnadu, India
(ed.note Nov. 2017: The good doctor has a fascinating blog at https://advancementinscience.wordpress.com)
2005

Hydrochloric acid is better.

V. G. Rajendran
- Trichy, Tamilnadu, India
2005

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