Next step after derusting?

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Forum topic by HokieMojo posted 09-19-2010 03:11 AM 2023 views 0 times favorited 6 replies Add to Favorites Watch
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2104 posts in 3752 days

09-19-2010 03:11 AM

Just wondering what the next step is after derusting. The 3 methods I’m aware of are; evaporust, acid, and electrolysis. When each of these 3 processes are done, there is something on the piece when you are done (either evaporust, acid, or sodium carbonate solution). How do you get this off? If you rinse it, you get flash rusting.

I think one idea is to “rinse” the item in mineral spirits to get it clean without rust, but I don’t know. That seems unhealthy and bad for the environment. What do you guys do? Any suggestions would be appreciated!

6 replies so far

View PurpLev's profile


8536 posts in 3673 days

#1 posted 09-19-2010 03:15 AM

I used evaporust (I like the non chemicals aspect). simply wash it off with warm water, and immediately spray with WD40. or wipe off with a paper towel, and spray and clean with WD40 skipping the water. I’ve done both with same results.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View MedicKen's profile


1615 posts in 3486 days

#2 posted 09-19-2010 03:23 AM

I usually hit the part with a wire wheel attached to my bench grinder. It takes off the black residue and cleans it up real nice

-- My job is to give my kids things to discuss with their

View Alexander's profile


193 posts in 3135 days

#3 posted 09-19-2010 03:28 AM

I have used “White Vinegar” on Horse shoes and old nail. But I could drop them in a can and let sit. I don’t know if you could brush it on or not. After I rinse off the Vinegar I use soap and water to clean off the Vinegar or it will taint the metal. I then dry them with cloth or air. White Vinegar cost about $1/gal.
PS Don’t pour the used Vinegar on the grass or it will kill the grass but does work well for killing weeds, so does pickel juice.

-- John at Sugarloft Mountain........Don't argue with an idiot; people watching may not be able to tell the difference.

View Dark_Lightning's profile


3165 posts in 3133 days

#4 posted 09-19-2010 04:21 AM

Depends on what you are doing with the part after “derusting”. If you are going to paint it, you can get primers that contain phosphoric acid and will convert the flash rust to iron sesquioxide (Fe2O3), which will prohibit further rust formation, once you apply a final topcoat. Note that the methods using phosphoric acid actually depend on iron oxide (Fe3O4) being present on the surface for conversion.

If you are not painting the part, I don’t have a recommendation, beyond oiling it if you aren’t putting unfinished wood on it.

-- Random Orbital Nailer

View swirt's profile


2780 posts in 2996 days

#5 posted 09-19-2010 04:48 AM

Wash it and oil it right away. Flash rust only sets in if there is time for it to set in. If it is a moving/wearing part, I use WD-40. If it is not a moving part (like the head on a hammer or a screw driver) I use BLO. If you sue BLO wipe it on, then wipe it entirely off, then let it dry for a day. (anyone that objects about BLO being gummy, didn’t wipe it off enough)

-- Galootish log blog,

View HokieMojo's profile


2104 posts in 3752 days

#6 posted 09-19-2010 06:09 AM

Thanks everyone.

You picked up on an excellent point. When painting, do you need to wipe of the acid? That doesn’t impact the paint durability if there is still some one there (or maybe it all reacts away). I didn’t realize that paints could contain the acid in them.

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