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Residue from rust removal

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Forum topic by Benvolio posted 09-28-2013 06:01 PM 1184 views 0 times favorited 5 replies Add to Favorites Watch
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Benvolio

148 posts in 1398 days


09-28-2013 06:01 PM

I have some old auger bits that I left over night (as per instructions) in a solution of rust remover, took them out this morning and although the rust is gone, there’s a bluey/greyish patina on them.

It sort of almost scrapes off with enough wire wooling. (but I don’t fancy wire wooling a whole auger bit set!)

I’ve left them all day in a solution of white vinegar and lemon juice thinking that would take off said patina but it hasn’t made a dent.

Any bright ideas??

Thanks

Ben

-- Ben, England.


5 replies so far

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Tim

3119 posts in 1428 days


#1 posted 09-28-2013 06:06 PM

Take out your aggressions on some scrap wood, it doesn’t take too long to come off. Or if it’s from evapo rust or a phosphoric acid you can just leave it, because it is a little bit rust protective. But now that you’ve tossed them in vinegar, I think you need to neutralize that with some baking soda or it will set them up for flash rust. That’s what happens to me after a vinegar bath.

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HorizontalMike

7158 posts in 2381 days


#2 posted 09-28-2013 06:22 PM

Ben,
Be aware that the residue you see is a stable iron phosphate coating, a chemically changed surface that is rust resistant because the iron is chemically bound to the phosphate and NOT readily available to bind with Oxygen and begin rusting as easily. Removing it all will just expose your bits to start rusting again.

-- HorizontalMike -- "Woodpeckers understand..."

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Benvolio

148 posts in 1398 days


#3 posted 09-28-2013 09:52 PM

I should point out that this patina isn’t the type you’d want on your drills… it’s they type that would stop the drill bit from twisting smoothly in the hole….

this was all about chemically getting back to the shiney steel you get from new.

And for rust provention I tend to use camelia oil.

so any ideas on how to rid bits of iron phosphate?

thanks

-- Ben, England.

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Tim

3119 posts in 1428 days


#4 posted 09-29-2013 12:46 AM

Yep, drill some holes with them. Stack some scrap wood to make a thicker trarget. Try it, it works.

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HorizontalMike

7158 posts in 2381 days


#5 posted 09-29-2013 11:45 PM

Yep,... use them… Other than that, buy new and sell in one week. I have a number of old bits handed down from my GG-father. I guess none of them, nor I, realized that only CERTAIN types of patina on old bits are OK, or more importantly are NOT OK… Sorry to take up your time. I’ll go away now…

-- HorizontalMike -- "Woodpeckers understand..."

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