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Originally Posted by unregistered
nope, cell corrosion WILL eat your lunch
'metallic path' NOT required
dig deeper
Titan151
this is one of the oldest on-going topics in WCing
and you have it a bit wrong, cell corrosion induces failures, not galvanic (for WCing)
EDIT: forgot to add
ck your sig, LOL
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This issue is not that complex. First galvanic corrosion is cell corrosion. The first image in the diagram is a basic corrosion cell. It applies to galvanic (dissimilar metals corrosion) as well as this "eat your lunch corrosion" you talk about. These are not two different things. The only thing changing is the two components that make up the anode and the cathode.
A cell will take place within the surface of a metal composed of the same material. For example steel will corrode when a portion of it becomes more anodic in reference to the rest of the area. That sets up a cell with those sections of the steel that are more cathodic. Slowly, this anodic area is oxidized resulting in metal loss. This is often how pitting will result in a sheet of steel. Second, I never claimed that galvanic corrosion was a real problem in water cooling. I have simply pointed out that if there is no metallic path between the waterblock and rad there will be no corrosion cell between the two. As for a corrosion cell within the Al rad, the metallic path cannot be eliminated. That said the biggest thing that can be done is to increase the resistivty of the electrolyte. This is why so many people use DI or DW water. If this alone does not solve the problem that is found there are many other methods of slowing the corrosion rate. As someone suggested, the use of Cathodic protection would actually work fairly well in some circumstances. At least a lot better then trying to coat the inside of the rad.
hmmm, sorry I think I Hijacked this post trying to defend Basic Science from the Bill A.
