Heatsink Problem

[dan394]

Hi, I've just been cleaning out my rig and noticed that the end of the heatsink looked strange - I know that the pipe ends aren't all supposed to be copper but the ends look corroded, so to speak - see the pics below?

Is this normal or is something wrong? It's only been in a few months...

http://i.imgur.com/VzDdx.jpg
http://i.imgur.com/vyQ3D.jpg
http://i.imgur.com/6unuq.jpg


Thanks and apologies for the poor quality photos

 

[mickyflinn]

Its normal, they have just added a bit of lead solder to seal the ends.

 

[doyll]

Yes, normal. The flux used to "tin" the end so solder sticks oxides the tube end / solder over time. Could mix a little baking soda in a little water and dampen a rag with it to wipe clean the ends of the tubes if you want.

 

[dan394]

Ah right thanks for your help guys