Nickel Fluoride

Nickel fluoride or Nickel(II) fluoride is the chemical compound with the formula NiF₂. Unlike many fluorides, NiF₂ is stable in air. NiF₂ comprises the passivating surface that forms on nickel alloys, e.g. monel, which is why such materials are good to store or transport hydrogen fluoride or elemental fluorine. Nickel is one of the few materials that can be used to store fluorine because it forms this coating. It is also used as a catalyst for the synthesis of chlorine pentafluoride