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-   -   rust rust and more rust FML (http://www.homebrewtalk.com/f51/rust-rust-more-rust-fml-241523/)

MrStrangeBrew 04-23-2011 01:22 PM

rust rust and more rust FML
 
so i finally finished cleaning up all the slag that was all over the inside of my keggle from being cut with plasma cutter. i spent a few days cleaning and grinding and scrubbing wit BKF and letting it sit on it over night to treat the steel. now that i finished that apparently the keggle wasnt done with me yet. now im getting rust around where the cut was. ive scrubbed it a few times with BKF and grinded it down with sanding discs. and let the BKf sit on it over nite and im still getting rust. do i need to cut it off? keep grinding? shoot myself in the head? help meeeeeeeeeee

http://www.homebrewtalk.com/gallery/...-24-01_640.jpg

http://www.homebrewtalk.com/gallery/...-23-53_554.jpg

http://www.homebrewtalk.com/gallery/...-23-46_191.jpg

Bachhus 04-23-2011 02:59 PM

Did you use a new cutting wheel and grinding wheel/disk on this? If you used one that you had grinded regular steel with you may have transfered that steel onto/into the stainless which is now rusting on you. I would switch out to a new sanding wheel to start. Not sure how to get rid of whats rusting now though.

MrStrangeBrew 04-23-2011 06:42 PM

Quote:

Originally Posted by Bachhus (Post 2862711)
Did you use a new cutting wheel and grinding wheel/disk on this? If you used one that you had grinded regular steel with you may have transfered that steel onto/into the stainless which is now rusting on you. I would switch out to a new sanding wheel to start. Not sure how to get rid of whats rusting now though.

yeah i used new ones. well even if steel is embedded shouldnt i be able togrind it out? maybe it was heat from plasma cutter?

dmfa200 04-23-2011 07:03 PM

Scrub it with scotch brite and wipe it with clean water. I mean the abrasive type(3M brand), not the kitchen scotch brite pads.
You'll get rid of it. Just may take a few scrubbings.

trigger 04-23-2011 11:23 PM

Yep, just keep scrubbing it like dmfa said. I had some spots on mine when they were new, and after a few brew/cleaning routines with a scrubby they haven't come back. If you need them gone now you could get some acid #5 (I think) from five-star and soak with that. I'm pretty sure that's the acid cleaner that re-passivates.

mmurray 04-24-2011 04:36 AM

Yep, It's just on the surface... keep going and you'll get rid of it.

MrStrangeBrew 04-26-2011 12:11 PM

Quote:

Originally Posted by mmurray (Post 2864193)
Yep, It's just on the surface... keep going and you'll get rid of it.

ok cool thats what i figured. i didnt want to have to cut it off but in a previous thread i had everyone was freakin me out about rust. ill keep working at it.

audger 04-26-2011 07:27 PM

http://www.howtobrew.com/appendices/appendixB-1.html

use some barkeepers friend, or similar cleaner with oxailic acid. that will put a passive oxide layer back on the steel you ground off and prevent rusting.

MrStrangeBrew 04-26-2011 08:52 PM

Quote:

Originally Posted by audger (Post 2871493)
http://www.howtobrew.com/appendices/appendixB-1.html

use some barkeepers friend, or similar cleaner with oxailic acid. that will put a passive oxide layer back on the steel you ground off and prevent rusting.

yeah the problem is ive already done that twice

mmurray 04-26-2011 11:11 PM

Quote:

Originally Posted by MrStrangeBrew (Post 2854451)
i have these that attach to my pneumatic die grinder. would this be something that i could use on inside? will i need something more coarse? i have green ones that are basically sandpaper not sure what grit. 3M makes them called Roloc discs.

http://www.homebrewtalk.com/gallery/...-53-28_683.jpg

Hit em with these again... then BKF


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