efs-2500 paint stripper removed anodize coating -safe?
efs-2500 paint stripper removed anodize coating -safe?
(OP)
An aircraft hose we made with blue anodized aluminum fittings had the anodizing removed to bare aluminum wherever efs-2500 paint stripper splashed onto it. This "envirnomently friendly" paint stripper is advertised as safe on aluminum and is being used on many aircraft.
If it's removes anodizing - isn't it removing aluminum and potentially corrosive? Whould we be concerned?
Examining the fitting under a microscope doesn't show any pitting and otherwise the fitting is in good condition - although it looks ugly!
-John
If it's removes anodizing - isn't it removing aluminum and potentially corrosive? Whould we be concerned?
Examining the fitting under a microscope doesn't show any pitting and otherwise the fitting is in good condition - although it looks ugly!
-John





RE: efs-2500 paint stripper removed anodize coating -safe?
Mike Halloran
Pembroke Pines, FL, USA
RE: efs-2500 paint stripper removed anodize coating -safe?
http://www.rusteco.com/efs2500f2.pdf
"pH 5.6-6.7" -- no problem for anodize.
"Contains 1-7% hydrogen peroxide." -- Aha, the oxidizer attacked (bleached) the dye. Poorly sealed anodize. So, agree with Mike (except for his anodizing terminology -- dyeing & sealing are separate steps.)
EFS-2500 also contain benzyl alcohol, a solvent, but the color disappeared rather than ran. Plus, the 'Blue A' dye used by most anodizers is extremely easy to bleach -- a few seconds for hypochlorite when doing wastewater treatment.
RE: efs-2500 paint stripper removed anodize coating -safe?
RE: efs-2500 paint stripper removed anodize coating -safe?
I'm amazed that hydrogen peroxide and benzyl alcohol can strip paint so well. Why have we been using that nasty stuff for all of these years?
RE: efs-2500 paint stripper removed anodize coating -safe?
I'd use an ohm meter myself. Depending on the coating thickness, I'm betting he'll still have 'some' continuity. When I did type-II anodizing years ago, the resistance of our coated-plates was significantly higher than bare Al, but we did have continuity. Though, we were doing backroom-anodizing as well, so I can't attest to the quality of said coating.....they were pretty though. ;)