Quote:
|
Originally Posted by |kbn|
My opinion is only really makes any difference if the metals are physically touching - dont know why.. but all of my stuff is fine.. Never used corrosion inhibiters, only d/I water + a biocide.
My d4 pump impeller is perfect - apart from the chip of the annodising that was there when it was new..... and I would assume that impellers would be the first thing to go.. if theres no contact of course..
If you have a lot of wetted bare non-annodised aluminuim then maybe avoid.. but I would say annodied is fine.. still wouldnt use it for a block's top and never touching copper/silver though...
|
Physical contact isn't required since the reaction is between dissolved metal anyway.
Quote:
|
Also some alloys of aluminuim (its rarely pure for many resons) have copper and a few others in them.. I wonder if that will eat itself.. jut and interesting not-related thought..
|
Adding dissimilar metals to make an alloy increases the resistance of the metal because one element can be sacrificed to protect the other. This is why they add zinc to iron when making steel. They don't eat one another because the reaction is not occuring in the metal, but rather between dissolved ions floating in the water and the surface of the metal.