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).
Some metals, like aluminium, stainless steel, and titanium, corrode, but form a layer on their surface that protects them from further corrosion. This is called Passivation. (Stainless steel can't passivate in chlorinated water).