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

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.  

Natalie Merrill

ACS PSS

Natalie Merrill, ACS PSS Chair
namerrill**At_Symbol_Here**gmail.com