A corrosion inhibitor is a chemical compound that, decreases the corrosion rate of a material, typically a metal or an alloy. A common mechanism for inhibiting corrosion involves formation of a coating, often a passivation layer, which prevents access of the corrosive substance to the metal. Permanent treatments such as chrome-plating are not generally considered inhibitors, however. Instead corrosion inhibitors are additives the metal or related object. Preventing moisture from getting in or other ways of oxidation.
In other words, it's just there cus it's a way of packing things and a way for the packer to cover his ass, incase your hardware is corroding. Since, they did everything they had to.
Edited by Xenthos - 2/1/12 at 7:56am