/sci/ - Science & Math » Thread #11053759

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Ships at the bottom of Ocean and rate of rusting

Anonymous Sun 13 Oct 00:36:06 2019 No.11053759 View Reply Original Report

Quoted By: >>11053855 >>11053877 >>11053887 >>11053927 >>11053977 >>11054083

So I have to ask, deeper down they are, do they rust slower?

If so is it because of the cold temp, lack of oxygen in the water, ?

Anonymous

Anonymous Sun 13 Oct 2019 01:23:02 No.11053855 Report

Quoted By: >>11053858 >>11053872

>>11053759
Anyone?

Anonymous

Anonymous Sun 13 Oct 2019 01:26:40 No.11053858 Report

Quoted By:

>>11053855
if you had asked a question about some asinine piece of mathematical formalism you would have gotten a response instantly, but you asked an interesting and reasonable question about chemistry, so you'll have to wait a little while.

Anonymous

Anonymous Sun 13 Oct 2019 01:34:54 No.11053872 Report

Quoted By:

>>11053855
This is /sci/, any question that isn't about climate change or denouncing women in STEM will have to wait.

Anonymous

Anonymous Sun 13 Oct 2019 01:40:44 No.11053877 Report

Quoted By:

>>11053759
Less oxygen iirc

Anonymous

Anonymous Sun 13 Oct 2019 01:43:47 No.11053883 Report

Quoted By:

That's an interesting question OP. I am not an inorganic chemist, but the rust process could happen from a wide variety of reasons, not all involving free oxygen. So long as there are oxidizing agents of any kind in the water, metal iron will tend to oxidize. Assuming oxidation frok oxygen alone, clearly continuous exposure of fresh air and salt water will have the highest rate of oxidation, with shallow water being next and deep water likely last. However there may exist a maximum where the not so cold portions of water achieve enough oxygen diffussion but still cold enough to concentrate it and achieve faster rate of reactions. Another factor in the depth of reactions might be the effect of uv-light helping speed up the oxydation process (by means of free radicals) so that there is a sweet spot for oxydation. For higher depths, pressure can also play a role that makes up for the reduced lack of oxygen.

Overall, i'd expect it to be fastest at the surface, and slowest at the absolute dark bottom. These are all conjectures though, as more information would be needed.

Anonymous

Anonymous Sun 13 Oct 2019 01:46:47 No.11053887 Report

Quoted By:

>>11053759
I don't know. I study mathematics. Interesting question though. Apparently oxygen is actually very high at the bottom of the ocean though only because there's almost nothing down there to consume it. And at the surface the oxygen gets exchanged with the atmosphere, so the least amount of oxygen in the ocean is somewhere in the middle, between those 2 extremes. I think that's right, again I didn't study ecology so I don't know.

Anonymous

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Anonymous Sun 13 Oct 2019 02:13:58 No.11053927 Report

Quoted By:

>>11053759
I simply can't bingo ITT.

>If so is it because of the cold temp, lack of oxygen in the water, ?
Yes, yes, and because they get covered in life and biofilms which helps preserve them a bit better.

Anonymous

Anonymous Sun 13 Oct 2019 02:40:55 No.11053977 Report

Quoted By:

>>11053759

No.

Many processes destroy shipwrecks.

For ships made of steel, steel itself an alloy of iron and carbon with other metals mixed in to change the properties. Iron and carbon in salt water creates a battery that oxidizes the iron.

For ships made of wood, the biggest factor is microorganisms. In this respect, silt, depth and oxygen levels matter for the support of the microbes.

Steel ships are constantly oxidizing in salt water. To prevent this, they employ cathodic protection systems. Once that stops, the steel starts to breakdown.

Anonymous

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Anonymous Sun 13 Oct 2019 03:36:31 No.11054083 Report

Quoted By:

>>11053759
There seems to be very little oxygen at greater depths but it is not consumed by the organisms. As for the temperature, oxidation is exothermic so it could allow the reaction to occur more than if it were endothermic but you still need a moderate amount of energy for the reaction to take place at a decent rate. There seems to be many contradictions in this thread however.

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