I would get it in the tank.... like soon. If you can't do it soon, I recommend putting it in a "distilled water bath" in the meantime. Distilled water does not contain Chloride or salts. This is helpful because it will leach out the chloride ions which have been absorbed into the lock from years in the ground. It also will prevent it from drying out which can likewise give ill effects on the lock. Post a before and after pic, I think after electrolysis you will be surprised.