How Can I Induce Corrosion Electrochemically?
Corrosion is a more or less involuntary/undesired reaction. If you apply a current, the corrosion is defined by the current you apply, so you are controlling the system, not just observing it. In general, electrochemical forcing puts your system into a highly unnatural regime, but can certainly provide interesting information.

Corrosion can be affected (in ways that you can determine and document) by temperature, by contact with other metals, by the corrosivity of the solution (concentration and specific ions), and by inhibitors.

Some time ago, we were interested in stress-corrosion cracking (failure) of stainless steels. Hydrogen, (slowly generated in a natural environment) would embrittle the steel. By increasing the corrosivity of the solution (chlorides) and adding an activator (sulfides), we were able to speed up the hydrogen evolution/absorption so that steel specimens under tensile stress would fail within days or weeks, rather than months or years in nature. This enabled choosing alloy compositions that were most resistant to stress-corrosion cracking.