Plumbing Kitchen Sink (Grounding faucets?)

[Fried Chicken]

I'm redoing my butcher block countertop, and part of that is redoing some of the plumbing in the sink.

I noticed that my water dispenser faucet (which is fed with a propylene tube) has a lot of corrosion on it after only a few years.
The regular faucet (fed with copper and steel lines) doesn't have this corrosion. Do faucets need to be grounded to prevent corrosion?

 

[Fried Chicken]

There's a much easier explanation: water was getting underneath.