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).
Yes, yellow chromated and yellow passivated are the same -- meaning an electroplated finish (usually zinc plating because it's the least expensive) followed by a yellow chromate conversion coating. 1  2. Black finish doesn't imply anything except the color. 2  3. Passivate is a tricky one because it means different things for different substrates.