nickel fluoride is a group VIII transition metal. It has a chemical structure that is similar to copper, but it has less oxidation activity and a lower melting point. It is used to make nickel alloys such as monel and has a variety of uses.
It is an odorless green powder with a minimum content of 32%. It is used in surface treatment (anodizing) and as a catalyst.
In anodizing processes, nickel fluoride is used to seal pores in aluminum oxide structures and close the pore sizes of nickel metals. It can also be used as a surface activator for the coating of electroless nickel-phosphorus on aluminum alloys in order to improve their adhesion and mechanical properties.
The surface-activation process has been applied for the deposition of electroless nickel-phosphorus (Ni-P) on anodized aluminum alloy AA1050, using aqueous nickel fluoride tetrahydrate (NiF 2 *4H 2 O). The activator resulted in more efficient Ni-P coating with better adhesion and wear resistance as well as improved morphological and structural results, in comparison to non-activated conditions.
Double pre-treatments are usually performed before the electroless coating process, using cadmium or palladium solutions as surface activators. These pre-treatments have been shown to improve the adhesion of electroless Ni-P, but they are time consuming and show less controllable structural properties compared to anodizing.
The re-conversion capacity of a NiF2/porous carbon nanocomposite is investigated by the BET method in order to obtain data on porosity, pore size distribution and electrode performance. This material has a reversible capacity of 830 mAh g-1 in the first cycle.