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How much HCl is consumed by rust? No room for acid additions

June 29, 2017

I am working with a company that runs a lot of very Rusty product through their hydrochloric acid. The dilution occurs pretty severely on a daily basis. They start with 32% Hydrochloric and after a week they're usually down to about 12% Hydrochloric. At this time they dump the bath. Because of this I was really curious about how much rust does it take on their iron products to generate one gallon of water into their Hydrochloric bath. They make daily additions to their bath but never have enough room even with the drag out to keep the acid up to strength. The metals concentration is not an issue as we have methods of keeping that reduced. there is no drag in whatsoever and the bath is run at 150 °F. I would greatly appreciate any help you could be!

David French
- Charlotte, North Carolina, USA

July 17, 2017

A. Hi David,
If you cannot get round your restrictions, then the only thing is to bail out a portion of the acid at the end each day. Work out how much to bail out and top up to maintain the acid within the desired specification.
Alternatively, is there a way you can look at reducing the rusting of the parts? Or are they received into you factory already rusted?
Good luck

Mark Lees
Aerospace - A sunny rock in the irish sea

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