Anvils allow you to rename items, repair enchanted items, and even combine the enchantments from different items, at the cost of experience points. Crafting. You'll need 3 blocks of iron, plus 4 more iron bars, for a total of 31 iron bars.
Passivation is the treatment of the surface of stainless steels, often with acid solutions (or pastes), to remove contaminants and promote the formation of the passive film on a freshly created surface (e.g. through grinding, machining or mechanical damage).
The passivation process will remove the free iron and other contaminates from the stainless and promote the formation of the beneficial oxide film. I suspect that the pool hand rail and diving board manufactures don't use a passivation step on their stainless steel. It makes some sense given that prior to the advent of SWG (salt pools), there was little need. With the SWG, and thus the salt (electrolyte), it would make more sense to have this done.