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How to Remove Oil content from Hydrochloric Pickling Acid

March 10, 2014

Q. During electroplating cleaning of furniture items by hydrochloric acid, which after a long time is mixed with oil content from the oil which comes on iron sheet of some freshly produced furniture items and this causes plating surface stripped after plating. Please suggest me how to remove oil content from acid.

Susheel daga
- jodhpur, rajasthan, India

A. Hi Susheel. Oil should float on top of mild pickling acid, and be relatively easily removed with an oil skimmer or by floating non-woven polypropylene cloth on top of it; the oil will have an affinity for the polypropylene and the water will not.

However, you should not put oily parts into pickling acid. The acid should be preceded by an effective cleaning procedure including alkaline electrocleaning followed by rinsing, so that almost no oil ever gets to the pickling tank.

You should then observe the work as it exits the pickle tank to make sure there is no water-break. Good luck.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
March 2014

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