Question

Is there a Standard Electrode Potential for Stainless Steel?

Answer 1

Yep

Answer 2

But how can that be if Stainless Steel isn't an element; it is many combined... And many Standard Electrode Potential's cannot be added up to find the one for stainless steel. (This is all in terms of corrosion)

Answer 3

Not that I know of. There's certainly one for chromium, and another for iron, and yet another for the other metals that might be in there, e.g. vanadium. But it would make very little sense to define a reduction potential for the entire alloy, because the different atoms in it would be reduced at different voltages. That is, there simply isn't a single voltage at which current will flow to or from a stainless steel electrode from or to a standard hydrogen electrode. Currents will flow at several different voltages.