It seems indeed to have been cleaned halfheartedly, with a lot of the surface rust still on it. The problem is that we don't know if it was desalinated. Most of the corrosion is produced by the reaction of interior salts with the surrounding humidity. Cerjak, I would probably just put it in a dry und stable environment with a lot of silicagel and watch it over the course of a few months. If there is a lot of corrosion, you could follow the procedure as mentioned. The coating will be removed when bathed in Aceton.
BTW, I'm pretty sure that it's no fake. It looks perfectly like an excavated, some hundreds to thousands years old piece of iron.
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