Rust Cleaners any good chemicals for it?

[Wingnut]

I know of Naval Jelly is there anything else?

I have a rusted sheet metal on a drawl bar shredder, I have gotten rid of 75% of the rust using a angle grinder. Now I have hundreds of rusted pit left over, I want to fill the pit in with something like Bondo (Bondo is a dirty word to me I promise I will wash my hands after I use it!) I don't want rain to collect in the pits and cause future holes!

So is there any good rust removers out there?

[chipmaker]

If you could find a large container like an old drum (plastic) or an old watering tank and line it with plstic sheting, fillit with water and add about 10 or 15 pounds of salt and hook up a battery charger to it withone lead attached to a piece of stainless steel and the other to the part turn on the charger, and let it go for a few hours......it will comeout shiney white metal and all traces of rust will be gone, as long as it did not have any oil in it anywhere. Then give it a good flush with clean water and allow to dry and them prime and paint. I use the salt/ battery charger method of removing rust on lots of things, but you really have to rinse it very very thourough and paint it as soon as its dry or it will get a coating of fine red rust overnight if you don't.

[jodyand]

What Chip said or sand blast it.

[Fusion1970]

Thats wild, Chip. I will have to try that sometime. And like Jody suggested, a snadblaster would work. Campbell Hausfield makes a small sand blaster that has a body like a spray gun, and it has the pipe that you stick down in a bucket of media. It's for small areas, but they are cheap.

Also, you could check out Eastwoods catalog. I think its at www.eastwoodco.com. They have alot of automotive/industrial type tools, abrasives, coatings, etc. that might be of some help.

Greg

[chipmaker]

You can also use baking soda at the rate of abouyt tablespoon per gal of water instead of salt......
Salt works faster and is just as good however.....but the baking soda leaves a black film or powder look and needs to be removed before painting, but it comes off with a swipe of a wire brush very easy.

The salt or baking soda acts as a path for the current as it becomes an electroylte. The process converts the iron oxide (rust) to another compound, and in the process its removed from the parent metal.
Stainless works best (since it holds up longer)as the Anode portion. This is where you attach the Positive lead from the battery charger. The Cathode will be the Negative lead and its attached to the item needing to be cleaned.

Place the Anode as close to the item your derusting as possible but do not allow it to touch.

Turn on the power and set back and wait.........it will start to bubble asnd foam and create a black foamy compound on top of the solution. Its important to make sure the entire item being de-rusted is totally submerged in the solution or it makes a line of demarkation where the salt level is at. The more amps and volts the faster it works, and theoretically you could use a simple 9 volt battery to derust items as well as a heavy duty battery charger..........it just needs a path (electrolytre solution of salt of baking soda) for the current to flow (DC current) and a constant flow of current to convert the oxides.

I have already used Epsom salts with good results as well.

[Argee]

Ospho

Ospho (http://www.jamestowndistributors.com/ak/Cleaning/Paint_Prep_Cleaners/Metal_fam/) is greenish liquid with the consistency of water. Brush or spray it on rust after just knocking off the loose scales and it pretty much stops rust dead. It also leaves no residue. The active ingredient is phosphoric acid.


Ospho stops rust, prepares rusted surfaces for painting. Ospho is a primer-not a paint. You do not have to remove tight rust. Merely remove loose paint and rust scale, dirt, oil, grease and other accumulation with a wire brush. Apply a coat of Ospho-let it dry overnight, then apply the paint. When applied to rusted surfaces, Ospho causes iron oxide to chemically change to iron phosphate - an inert, hard substance that turns the metal black. One gallon covers 600 square feet.

[LEOLAV]

What about a product like POR15? Doesn't remove the rust, but it encapsulates it to prevent further damage. I use it all the time on our old vehicle frames.

[Argee]

Hey Leo...does that POR15 have phosphoric acid in it??

[LEOLAV]

I'll find out from our rep who sells the Por 15.

Leo

[LEOLAV]

Just spoke with him a minute ago, he states that the ingredients are proprietary. He did say that most info can be found on their website. I looked quickly and found the following statement for proper preparation.

WHAT IS THE 'PROPER PREPARATION'?
We make a product called 'Metal-Ready'. It's a rust remover that leaves a zinc phosphate coating on base metal, the perfect preprimer for POR-15. NOTE: New steel is coated with a protective oil finish at the mill. This finish must be removed before using POR-15 or Metal-Ready. Clean metal first with POR-15 Marine-Clean, then rinse with water and dry.


They also claim that it gets harder with moisture. Sounds like it would not likely contain Phos. Acid.

I'll get the MSDS sheets and see what info I can get from that.