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Old 07-17-2019, 02:03 PM
crystallographic crystallographic is offline
MetalShaper of the Month October '14 , April '16, July 2020, Jan 2023
 
Join Date: Dec 2010
Location: Western Sierra Nevadas, Badger Hill, CA
Posts: 4,388
Default neutralizing aluminum gas welding flux

Specifically to the question about neutralizing AGW flux in hard-to-reach areas - I use a 25% phosphoric with either a brush or a pump spray.

(Must for Rust has been my go-to for many years)
It will etch steel and aluminum, so I wipe it quickly before it dulls any polished areas. It helps bond primer coats, also - when wiped dry.
I also use it to rinse aluminum fuel tanks that have been gas welded, as a standard shop routine.

-end-
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