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"Stripping zinc phosphate"



2005

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

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