Galvanic corrosion

[Fess_ter]

I notice a lot of copper water blocks come with brass fittings. I know aluminum and copper will cause bad galvanic corrosion, but what about brass and copper?

Also, how well do products like Red Line wetter stop corrosion? What is the ratio of "wetter" to water needed?

 

[AMDGuy]

Fess_ter (Jun 21, 2001 11:14 p.m.):
I notice a lot of copper water blocks come with brass fittings. I know aluminum and copper will cause bad galvanic corrosion, but what about brass and copper?

Also, how well do products like Red Line wetter stop corrosion? What is the ratio of "wetter" to water needed?

Brass and Copper are so close that galvanic corosion doesn't occur with these metals. If you want to use water wetter or a similar substance for protection then 10% water wetter to your water would be plenty. The ratio for mixing is on the container.

 

[Beggar]

on the topic does ne one know a good way to stop/reduce corrosion in an aluminium/copper system, and also does anyone know how flow rates affect corrosion?

 

[Badger]

I know some one will disagree with me here but the simple truth is this; You cant get galvanic corrosion unless the two dissimilar metals are in electrical contact with each other. Think of it like a car battery unless you connect the terminals no current flows through the electrolite and no movement of ions (corrosion) occurs. So all you need to do is make sure there is no electrical path exists (like through the case) between your components and you will have no trouble.