Corrosion - Nickel, chrome? PT nuke -PHN or silver?

[schoolslave]

I have a couple of questions about potential corrosion issues and what biocide is considered "safe" nowadays.
First, would there be any corrosion issues with using the following:

Chrome plated waterblocks
Nickel plated waterblocks
Brass fittings
Full copper radiator (Alphacool UT60)

Second, ever since the whole EK nickel issue, I feel that silver may not be the best biocide to use anymore.
I have also had personal experience with using a silver kill coil, in a loop containing only nickel plated blocks and brass fittings.
The silver coil currently looks like this:

That particular loop contains only distilled water, nickel EK blocks, and brass fittings.
The coil looks like it rusted or something, the loop is about 4-5 months old.
Radiators and waterblocks were flushed and cleaned before use.

I have heard that the "regular" PT nuke can cause issues due to the copper sulfate.
Is PT -PHN a better alternative?
Would pure distilled + -PHN cause any issues with chrome plate blocks, copper radiator, nickel plated blocks, and brass fittings?

[WicKeDcHilD]

Copper and silver works pretty good but soon as you go to nickel, it is best to use what the company recommends, as they know what their blocks are made of and what will corrode them.

[earthwormjim]

Pure silver isn't what would corrode in a copper and nickel loop. That is probably not a pure silver coil. See if you can wipe that stuff off, maybe its radiator flux.

EK's nickel issue IS NOT caused by people using mixed metals in their loop or additives. EK used substandard plating thickness and horrid prep work on their blocks. They were selling blocks that already had fissures in the nickel plating.

[Boulard83]

Pure silver isn't what would corrode in a copper and nickel loop. That is probably not a pure silver coil. See if you can wipe that stuff off, maybe its radiator flux.

EK's nickel issue IS NOT caused by people using mixed metals in their loop or additives. EK used substandard plating thickness and horrid prep work on their blocks. They were selling blocks that already had fissures in the nickel plating.

+1

I had 2 EK GTX580 block that coroded near the center and in the gpu channels but i NEVER had any other issue in my whole WC life with distilled and PTnuke.

[Kayin]

Deposition plating. Saw it before in the past. Copper ions in loop plate onto the silver, it's harmless.