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Doing oil rust protection test. best way to rust?

T

taseal

Gunny Sergeant
Full Member
Minuteman
Apr 18, 2011
1,575
38
SE FL
#1
I got few products I'm gonna test for myself, and everyone else out there. I'm actually making a youtube video out of it for everyone to see.

I have a cup with bunch of salt in it (not sure how much, but maybe 1/20th of the cup. important thing is, it's the equal amount for all) and I was thinking of just leaving it in there for a few days. but I believe I might speed up the process if I pull them out of the salt water (each has it's own cup) and then air dry them.

would do help the process (removing it after 1 day and letting them air dry)? or should I just leave them in the salt water for 2 days

thanks!

it = some cheap kitchen knives btw. just some stainless steel dining knifes.
 
#2
Re: Doing oil rust protection test. best way to rust?

Just had an interesting experience w. rusting/corrosion, that may help you.

Roundabout story... but I help the local FD maintain their vintage 1924 fire truck. It's fully restored. Last year, a local firm built and donated a building to store the truck. Brand new frame building, very nice.

On Tuesday night, we went into the building. When we walked in, we got a slight burning in our eyes and it smelled funny. Then Jeff, who is in charge of the truck, freaked. All the brasswork was corroded, the nickel was grey and etched and the bell was black/blue color. The copper fire extinguishers were a battleship grey color and deeply etched. Any exposed ferric metal was badly rust bloomed. This was in 3 weeks... since the truck was last inspected.

We initially thought the battery had exploded or outgassed. But it was fine. Then we noticed the floor was wet (some water got under the door during Irene or the subsequent rainstorm). The water had started to lift the floor paint. Under the pieces of carpet that the truck parks on it was still wet...

I was picking at the floor paint and pointing out that it had lifted when one of the FF's said he was surprised that the floor had lifted "because they did such a good job acid washing the floor before painting..." Bingo! Apparently, before the floor paint was put down, the new concrete slab was etched w. strong muriatic. And it wasn't neutralized and wasn't washed sufficiently.

When the water got on it, it re-activated the muriatic acid. In a hot, unventilated building the acid was thick in the air. The corrosion on everything was just appalling and fast.

Fortunately, it will polish out. The nickel didn't etch too badly. The ferric metal will clean up with Scotchbrite and we are pulling the head this weekend to make sure there is no bore damage. The Aluminum parts and painted parts weren't affected at all...

Anyway, this was a long way of saying that if you want to rust the heck out of something fast... put it in a container (an upside-down fishtank would be ideal) with some muriatic acid in a ceramic container and keep the chamber warm and damp. If you don't want to buy a whole container of muriatic, you can get battery acid in smaller quantities.

Hope this will help. And I learned a great lesson about prepping garage floors! Bad news to shortcut the cleanup after etching.

Cheers,

Sirhr
 
#3
Re: Doing oil rust protection test. best way to rust?

That sucks!

yeah I knew about acid. but I wanted to use salt water to replicate real life rusting. I won't be in any type of acid warfare hopefully. lol
 
#5
Re: Doing oil rust protection test. best way to rust?

Saltwater electrolysis - it stands to reason that if rust can be removed with direct current, then rust can be added by using the same solution and reversing the polarity.
 
#6
Re: Doing oil rust protection test. best way to rust?

Go toss your stuff in the ocean for a few hours while you sun your nuts on the beach!!

smile.gif
 
#8
Re: Doing oil rust protection test. best way to rust?

I am using salt water

but should I let it sit in there for few days, or should I spray salt water? I was thinking maybe the air drying action with the salt might speed the action
 
#9
Re: Doing oil rust protection test. best way to rust?

Or bottle some of the sea water up and spray away. An added benefit is the steel (and oils) does not contaminate your solution as dipping would.
 
#11
Re: Doing oil rust protection test. best way to rust?

Bleach (hypochlorite) and hydrogen peroxide both are strong oxidizers. A light spritz of either from a spray bottle would be the real acid test ...so to speak.
 
#12
Re: Doing oil rust protection test. best way to rust?

PHP:
Corrosion tests are usually conducted with 5%salt solution 95%di water @ 95f and 95% rh for a period of 1000 hours with a 1 hour ambiant cycle every 24 hours. The samples are usually scored for rapid decay and a control sample untouched in the same condition. Typically ph readings are taken for acidity levels pre and post. By just putting some stuff in salt water is a waste of time, ypu will have no control data or repeatability from test to test.

Rich
 
#13
Re: Doing oil rust protection test. best way to rust?

One more thing the solution is applied by mist in a controlled enviornment and collection rates are measured every 96 hours for even application.


Rich
 
#14
Re: Doing oil rust protection test. best way to rust?

just buy some eezox and you'll then have the best rust protection without having to do any tests
 
#15
Re: Doing oil rust protection test. best way to rust?

Salt water spray test is the standard way of accelerating rust. Spray or mist is much more active than sitting in salt water.
 
#17
Re: Doing oil rust protection test. best way to rust?

Good advice thus far.

Salt spray because you need the additional oxygen to accelerate rust. Salt water is your best and easiest test to conduct....and its really simple. You don't have to have it sit is constant spray, just spray it leave it, spray it leave it, etc.etc.

Now if your testing a concoction you are making up and want to represent that test to others, well that is different and you have to follow protocols.
 
#19
Re: Doing oil rust protection test. best way to rust?

Not sure how you are measuring rust, but if it's just a look test, you can be fooled if some of it falls off between looks. Normally, corrosion is measured by % weight gain. The greater the slope, the faster you are oxidizing. Then when the weight drops all of a sudden, you know you have spalling. You'll need a pretty darn accurate balance though. Since we deal in grains for a lot of stuff here, I'm guessing that may suffice.
 
#20
Re: Doing oil rust protection test. best way to rust?

Thanks guys.

I was thinking of weighing, but it's too late. I'm put of town for few days, and I sprayed some of my salt water solution and gonna let itnsit for 2 days with the sprayed Water.

Also I used hotnwater with the spray.
 
#22
Re: Doing oil rust protection test. best way to rust?

We have been comparing lots of different rust preventatives (eezox, clp, sewing machine oil, motor oil, rem oil, vaseline, etc...) by applying them to the goose neck hitch in the bed of the truck. That thing seems to rust so easily. So far vaseline is a clear winner and a far second place is eezex and clp falling in behind that.
 
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