Electrolysis and oxidation of copper

[Tainted]

I went to a building which had some green residue in the water main where all the ground connections connected to.

How can you tell the difference between electrolysis due to DC current and oxidation due to water damage?

Based on the picture shown, is this caused by oxidation or DC current in the water system?

 

[ptonsparky]

Looks like a corrosive atmosphere and condensation to me.

 

[retirede]

Looks like a corrosive atmosphere and condensation to me.

+1

 

[Tainted]

how can you guys tell versus the DC current?

 

[ptonsparky]

Look at the top of the pipes. Look at the areas that appear to be tracks of moisture. Why is the corrosion more apparent in those locations?

 

[Tainted]

Look at the top of the pipes. Look at the areas that appear to be tracks of moisture. Why is the corrosion more apparent in those locations?

This building has a massive water infiltration problem. I went there on a rainy day and the water was just seeping through the concrete walls and ceilings.

 

[ptonsparky]

This building has a massive water infiltration problem. I went there on a rainy day and the water was just seeping through the concrete walls and ceilings.

You have your answer.

 

[Tainted]

You have your answer.

Just wanted to make sure because DC current can also give some kind of green material on the copper.

 

[ptonsparky]

FWIU, dry concrete is not an issue.

 

[gadfly56]

It looks like the clamps and screws are steel. You may be getting some galvanic corrosion here.