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Old 06-03-2015, 09:00 PM   #181
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I have some silica fume left since I rebuilt my boat. I used it to thicken polyester resin. Silica fume is very lightweight very thin and very inert. I mixed some up with vinegar and spread over very rusty piece of metal. Tomorrow I will see how it all be....
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Old 06-05-2015, 05:44 PM   #182
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Some Rust fighting results

So, I mixed silica fume with vinegar and spread over very rusty piece of metal:




I left piece of metal in vertical position outside. It is very warm and dry outside right now. Here is the next day:



It did affect the heavy rust, but it dried out to quickly... I decided to use the same mix, but covered it with plastic poly. Here is what happened in the morning:



This is after washing it off with warm water and plastic brush (no heavy scrubbing)



This is not bad at all for such a heavy rust, which I didn't even touch.

I think if I mix silica fume with vinegar to make it sprayable consistency I will be able to spray frame over every few hours and It will work great.

The other thing I am going to test is oxalic acid with silica fume and also phosphoric acid with silica fume.

Phosphoric acid is a rust inhibitor and I will use it before protecting steel anyways.
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Old 06-05-2015, 05:52 PM   #183
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Wow!!

So - ...white vinegar and anything that keeps it on the metal!!


thjakits
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Old 06-05-2015, 05:58 PM   #184
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Originally Posted by thjakits View Post
Wow!!

So - ...white vinegar and anything that keeps it on the metal!!


thjakits
This is very true....

The best way is to submerge it but I think I will need a very very big tub to submerge my bus frame, so, dancing around will be necessary....

I ordered some oxalic acid on eBay. It is dirt cheap and people say it works even better than vinegar...

Oxalic Acid 99 5 5 lbs Metal Cleaning Rust Removal with Free Scoop | eBay

Let's wait and see....
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Old 06-05-2015, 10:57 PM   #185
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I've been working with a lot of hot rolled new steel that has sat in Houston humidity with predictable results. Lots of surface rust on top of mill scale. The only thing that has worked for me so far is Muriatic acid. I have a flat bottom tray that most parts will fit into...leave it for 15-20 minutes and you come back to very clean metal. Just be sure...A., not to breathe it or get it on you...and...B., rinse & dry it thoroughly. It quickly removes both the scale & rust.
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Old 06-05-2015, 11:43 PM   #186
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One other item you might try is cleaning vinegar. It has a higher acid
content than regular vinegar.
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Old 06-06-2015, 06:43 AM   #187
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Ditto on what Tango said for heavy rust removal on heavy pieces. If yu do want a stronger white vinegar (Acetic acid), Sam's Club sells 10% in 55 gallon drums. The last one we bought for use here on the farm was only $75.00. If we want 5% for household use we simply dilute half in half with water. I've used it for cleaning rust from the inside of a fuel tank (didn't want to take a chance on eating through the sheet metal with Muriatic Acid). Muriatic Acid (dilute HCL (Hydrochloric acid)) can be some nasty stuff but is very useful in the hands of someone who knows what they're doing and respects it. The fumes can liquify the linings of your lungs so make sure you're using it in a well ventilated place with the proper safety gear (gloves, apron, safety glasses, etc...). ALlso, it's a good diea once rinsed off with water to neutralize a bit with either baking soda or soapy water and then rinse to stop the working of any residue on the part. Steel is, after all, porous.
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Old 06-06-2015, 12:02 PM   #188
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My first go-to for heavily rusted parts, at least parts with some weight to them, is a needle scaler, followed by rust-mort. (Rust-Mortâ„¢ Products | SEM Products)
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Old 06-06-2015, 09:44 PM   #189
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My first go-to for heavily rusted parts, at least parts with some weight to them, is a needle scaler, followed by rust-mort. (Rust-Mortâ„¢ Products | SEM Products)

Looks like Ospho.
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Old 06-09-2015, 08:48 PM   #190
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I'm looking forward to seeing some photos...
must be a lot of fisherman in here hence the picture rule!
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