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Old 19-10-07, 08:49 AM   #21
New Leaf
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Default Re: Scientific Experiment.

I can't decide if all these replies represent genuine interest, you lot humouring me, or just plain old taking the p1ss. Still i promised an update - so here you go...





These were taken almost 48 hours after initial exposure.

As you can see the sample with no protection at all is rusted to buggery. Interestingly the steel wool and nails stil look perfect if you lift them out of the pot, but there is a thick pile of iron oxide particles in the bottom of the beaker, and suspended in the water. I suspect that rusty water may be acidic and hence its corroding the the rust off the metal as soon as its formed.

The 2 protected samples have clearly faired much better. The one in the middle is treated with acf-50 and surprsingly seems to have faired a little worse than the wd-40.

Maybe this was due to me being a bight tight with the acf-50 can - as its sooo expensive . ( or maybe its just an expensive con and no beter than wd-40)

I'm expecting the wd-40 to catch up over a few days as it disolves in the water and evaperates.

We'll see.

Last edited by New Leaf; 19-10-07 at 08:51 AM.
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Old 19-10-07, 08:58 AM   #22
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Default Re: Scientific Experiment.

Those photos are blocked at work ... classed as "Criminal Skills" WTF?!?
ROFLMAO
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Old 19-10-07, 09:40 AM   #23
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Default Re: Scientific Experiment.

Very interesting. I'm not humouring you btw, its interesting. Plenty of air there too so just like a wet SV
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Old 19-10-07, 09:41 AM   #24
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Default Re: Scientific Experiment.

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Those photos are blocked at work ... classed as "Criminal Skills" WTF?!?
ROFLMAO
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Old 19-10-07, 09:47 AM   #25
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Default Re: Scientific Experiment.

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Originally Posted by Dr Rich View Post
Yes, the antifouling properties are important but I am still surprised. Like Adburn says, I think there could well be enough air in there, the classic experiment ususally used boiled water. I would have thought at shallow depths steel will rust. Canons and stuff are rusty when hauled up usually are they not?
What, no second chances allowed then?
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Old 19-10-07, 09:50 AM   #26
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Originally Posted by Warthog View Post
I don't want to pick holes in your experiment, but rust needs oxygen to develop, so you might have to keep dumping them in and pulling them out every 30 mins. Just think of ships and planes under the ocean, they are not rusty, just covered in barnacles
There's a much greater concentration of oxygen in water than in air, in fact it's 1/3 oxygen, thats why things rust quicker when they're wet. The oxygen atoms in the H2O molecules bond with the iron in the steel creating iron oxide (rust) and small amounts of hydrogen gas, so theres no advantage of exposing the steel wool to air. Doesn't matter if the water's distilled or boiled it still contains the same amount of oxygen to react with the iron in the steel.
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Old 19-10-07, 10:23 AM   #27
Ceri JC
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I demand time lapse film footage of the rust forming!
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Old 19-10-07, 10:26 AM   #28
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Default Re: Scientific Experiment.

Quote:
Originally Posted by Dr Rich View Post
Yes, the antifouling properties are important but I am still surprised. Like Adburn says, I think there could well be enough air in there, the classic experiment ususally used boiled water. I would have thought at shallow depths steel will rust. Canons and stuff are rusty when hauled up usually are they not?
On big ships they also have sacrificial zinc anodes. Not something you can use on something that isn't submerged.
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Old 19-10-07, 11:55 AM   #29
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Default Re: Scientific Experiment.

Intersting stuff, sort of thing i'd do at home myself so thanks for saving me the time and effort and please do keep updating this.
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Old 19-10-07, 01:06 PM   #30
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There's a much greater concentration of oxygen in water than in air, in fact it's 1/3 oxygen, thats why things rust quicker when they're wet. The oxygen atoms in the H2O molecules bond with the iron in the steel creating iron oxide (rust) and small amounts of hydrogen gas, so theres no advantage of exposing the steel wool to air. Doesn't matter if the water's distilled or boiled it still contains the same amount of oxygen to react with the iron in the steel.
On warships, its the layer just above the waterline that rusts the quickest. Anything below the hull rusts a lot slower. Ask a sailor
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