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We all live in a yellow Submarine (or maybe not)

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The Artist
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Joined: 06 Jan 2008
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PostPosted: 22:42 - 12 Jul 2023    Post subject: Reply with quote
Islander wrote:
Galvanic corrosion refers directly to the electrochemical reaction between two dissimilar metals in the presence of an electrolyte. Carbon isn't a metal...

It's probably got more to do with multiple extreme pressure cycles causing delamination of the carbon fibre material...


CF is electrically conductive so galvanic corrosion still happens when it contacts metals.
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Nobby the Bastard
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Joined: 16 Aug 2013
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PostPosted: 22:45 - 12 Jul 2023    Post subject: Reply with quote
Conductive doesn't mean galvanic corrosion would happen. that implies losing or gaining ions rather than allowing ions to flow through.


carbon doesn't rust.
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The Artist
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PostPosted: 23:23 - 12 Jul 2023    Post subject: Reply with quote
Nobby the Bastard wrote:
Conductive doesn't mean galvanic corrosion would happen. that implies losing or gaining ions rather than allowing ions to flow through.


carbon doesn't rust.


I think its because CF being conductive allows galvanic corrosion in the metal.

https://www.tc.faa.gov/its/worldpac/techrpt/tctn17-42.pdf
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Nobby the Bastard
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PostPosted: 23:32 - 12 Jul 2023    Post subject: Reply with quote
There's no free oxygen 3 miles down. No point quoting stuff about planes.

There are five conditions that must be satisfied for composite-to-metal galvanic corrosion to
develop [1]:
1. An actively corroding metal
2. An electrically conductive composite (usually carbon fiber)
3. An electrical connection between the composite and the metal
4. An electrolyte (usually salt water)
5. Oxygen

Titanium is also really not known for oxidising that quickly. In fact Titanium is used in saline environments because it's incredibly resistant to oxidation.
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The Artist
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PostPosted: 23:53 - 12 Jul 2023    Post subject: Reply with quote
There is oxygen when it surfaces. Sure Titanium doesn't oxidise fast and this is not likely to be the cause of failure, it's still interesting.
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Easy-X
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PostPosted: 00:42 - 13 Jul 2023    Post subject: Reply with quote
Surely the cumulative stress would be the problem. How many trips up and down did it make?
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MCN
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Joined: 22 Jul 2015
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PostPosted: 04:04 - 13 Jul 2023    Post subject: Reply with quote
Islander wrote:
MCN wrote:
"The structural integrity of Titan has been brought into question after its creator, Mr Rush, appeared to boast about allegedly cutting corners to design the submersible.

"I'd like to be remembered as an innovator. I think it was General MacArthur said, 'You're remembered for the rules you break'," the 61-year-old said in an old video.

"And you know, I've broken some rules to make this. I think I've broken them with logic and good engineering behind me.

"The carbon fibre and titanium, there's a rule you don't do that - well I did."

He is understood to be talking about the risk of mixing the two materials, which could cause galvanic corrosion due to its different electrochemical properties."

Darwinian Rules remain intact though. Laughing

(Stockton 'Hold my Beer' Rush)


Galvanic corrosion refers directly to the electrochemical reaction between two dissimilar metals in the presence of an electrolyte. Carbon isn't a metal...

It's probably got more to do with multiple extreme pressure cycles causing delamination of the carbon fibre material...


I saw that two...
(I quoted the piece from another source.)
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.
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MCN
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PostPosted: 04:13 - 13 Jul 2023    Post subject: Reply with quote
Someone suggested they had about a minute or so before implosion.

The vessel lost balance and tipped vertically in the water at about 1500m.
They would all have landed on top of each other in the titanium end cover.

The clown steering would be unable to release the scrap metal (ballast) at that point to allow the vessel to return to thesurface.
So they would have had plenty of time to rethink the whole idea. And ask for their God's forgiveness.
(God must have wanted them for a sunbeam, as God is omnipotent, all powerfully and can work miracles too.)
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