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Breakdown of metal passivation layers

by Excom
Tags: breakdown, layers, metal, passivation
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Excom
#1
Aug26-14, 06:58 PM
P: 48
Hi All

I hope that someone where can help me out.

Let's assume that we take a piece of Al foil and a Pt wire and put them into an ionic solution. We then apply a voltage difference of 2 V between the two. Al(+) and Pt(-). After a few seconds the Al electrode starts to corrode. Nothing new about that but can anyone tell me what happens before the corrosion starts? I assume that the aluminum oxide is being removed. I am interested in figuring out what voltage that is needed to remove the aluminum oxide. And the kinetics of it.

If this can be described in a theoretical manner I will prefer that as I would like to compare different metal oxides at different voltages.

Thanks

Best regards
Tom
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Borek
#2
Aug27-14, 01:52 AM
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Way too many unknown factors for a theoretical treatment, experiments are a way to go.
Excom
#3
Aug27-14, 04:56 PM
P: 48
Okay, thanks.

Instead of testing every metal oxide there must be a way of finding those oxides that are most likely to be the best.

Any idea of how to this?

Borek
#4
Aug28-14, 02:09 AM
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Breakdown of metal passivation layers

Quote Quote by Excom View Post
to be the best
In what sense?
Excom
#5
Sep2-14, 03:44 PM
P: 48
I want to find the best materials for passivating electrodes in ionic solutions.


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