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Galvanic corrosion #5167113 07/21/19 10:20 AM
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LeakySeals Offline OP
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I'm wondering if this is an example of galvanic corrosion. The brass has turned blue near the steel tank and near the stainless (I think) one way check valve.

[Linked Image]
[Linked Image]


06 Escalade 6.0L LQ9 AWD 167k M1 0w40
03 Maxima 3.5L POS 170k ST HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
Re: Galvanic corrosion [Re: LeakySeals] #5167120 07/21/19 10:31 AM
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spackard Offline
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Looks chemical-related.
From another website:

Equation 1: 4Cu + O2 → 2Cu2O [red to pink]
Equation 2: 2Cu2O + O2 → 4CuO [black]
Equation 4: 2CuO + CO2 + H2O → Cu2CO3(OH)2 [“malachite,” dark green to blue]

Re: Galvanic corrosion [Re: LeakySeals] #5167123 07/21/19 10:34 AM
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walterjay Offline
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That is not galvanic corrosion.

Re: Galvanic corrosion [Re: LeakySeals] #5167144 07/21/19 10:59 AM
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Mainia Offline
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Chemical, and nothing to worry about.

Re: Galvanic corrosion [Re: LeakySeals] #5167146 07/21/19 11:00 AM
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Rand Online Content
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thats just normal copper/brass corrosion.

This is the bad stuff.

IMG_20190625_135216.jpg
Last edited by Rand; 07/21/19 11:05 AM.

2019 Jeep Cherokee Trailhawk 2.0T
Re: Galvanic corrosion [Re: LeakySeals] #5167168 07/21/19 11:23 AM
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MasterSolenoid Offline
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Op - I'd say NO.

Galvanic Corrosion needs three things to begin:
1) Two different metals
2) They have to be touching
3) Moisture present

There is a whole science behind understanding it.
Therefor, I take it seriously when doing auto & home repairs.
There is also a chart showing how similar (or different) metals are to each other / affecting their rate of galvanic corrosion.

One example: FORD attaching aluminum panels onto steel frames.
They must use a spacer as a separator.


Last edited by MasterSolenoid; 07/21/19 11:34 AM.

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Re: Galvanic corrosion [Re: LeakySeals] #5167487 07/21/19 05:41 PM
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eljefino Online Content
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Doesn't look too different from mine. I wouldn't worry.

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/5058458/1

Re: Galvanic corrosion [Re: eljefino] #5167896 07/22/19 09:18 AM
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LeakySeals Offline OP
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Originally Posted by eljefino
Doesn't look too different from mine. I wouldn't worry.

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/5058458/1

I noticed you use a cycle stop valve. Have you ever been to the Terry Love plumbing forum? I asked basic questions over there and the minute they find out I have a monodrive they blame everything on that and they try to sell me a cycle stop valve LOL


06 Escalade 6.0L LQ9 AWD 167k M1 0w40
03 Maxima 3.5L POS 170k ST HM 10w30
05 Malibu Classic 2.2 111k M1 5w30
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