No, conversion coating results from a chemical reaction process with the part surface and does not involve electrical current being applied to the part. It is not an electrochemical process.
Yes, this is true and is guided by the MIL-A-8625 spec. The chemfilmed area has, however, only about half the corrosion resistance of the anodic coating.
After about 24 hours in room temperature.
It can range between 0.000001 and 0.000004 inches as a general guideline. It is very thin.