From:
Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU>
Subject:
Re: [DCHAS-L] Electro polish "hot rinse" ventilation Q
Date:
Apr 4, 2022 15:22 UTC
Reply-To:
Monona Rossol
In-Reply-To:
Re: [DCHAS-L] Electro polish "hot rinse" ventilation Q
well, what is it "polishing" off? Is it reacting with surface corrosion or what? And depending on the concentration, some sulfuric acid and sulfur oxides are likely to get airborne. If there is a bubbling action or agitation of any kind, even more is getting airborne. There's a lot to be learned here before assuming nothing other than water is evaporating.
Monona
-----Original Message-----
From: pzavon**At_Symbol_Here**ROCHESTER.RR.COM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Sent: Mon, Apr 4, 2022 10:32 am
Subject: Re: [DCHAS-L] Electro polish "hot rinse" ventilation Q
I wonder if it is primarily for humidity control.
Peter Zavon, MS, CIH
Penfield, NY
PZAVON**At_Symbol_Here**Rochester.rr.com
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of Natalie Merrill
Sent: Monday, April 4, 2022 7:35 AM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: [DCHAS-L] Electro polish "hot rinse" ventilation Q
Hello Colleagues,
For an electro polish system which comes equipped with good ventilation at the phosphoric acid/sulfuric acid bath, there are three more water baths in succession with the final one being warmed to 115F with deionized water. Because we have an installation of an additional ventilation trunk dedicated to the fourth (warm water) bath, which the manufacturer does not require (and isn't shown in the equipment design) I wondered what that ventilation over the water bath might be needed for?
Q: In the electro polish of stainless steels, would there be any expected evolution at the warm water rinse step? The first rinse is cool water "drag out", then a water "pre-rinse", then the final warm rinse. (This system does come complete with in-room water treatment and a large neutralization system, that is not what I'm asking about). The water supplied to the baths is filtered and deionized.
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