Platinum is widely used as electrodes in metal finishing industries due its advantage of having special chemical & physical properties like high corrosion resistance, thermal conductivity and catalytic nature. Being a very expensive metal, instead of using solid form, platinum is deposited on the surface of titanium or niobium, occasionally on molybdenum by micron level layer. Electrodes [Anodes or Cathodes] are available with hanging hook, frame or band in the form of sheet, mesh, pipe, wire, rod and custom built. Platinised titanium anode is used in electrolytes having no fluoride. Platinised niobium anodes are used in electrolytes having fluoride, where we need better conduction (its conductivity is three times of titanium) and also it is suitable for Sulphuric acid chromium plating bath operated at current density greater than 75A / dm². Platinised titanium / niobium anodes are having the advantages of Low weight - good current resistance; Long life operation - maintenance free; Economical - due to low platinum requirements; High dimensional stability and low resistance; Highly suitable as auxiliary anodes of complex geometrical shapes.
Platinum Features:-
Platinum is a lustrous silvery-white, malleable, ductile metal and a member of group 10 of the periodic table of the elements. It has the third highest density, behind osmium and iridium. Platinum is unaffected by air and water, but will dissolve in hot aqua regia, in hot concentrated phosphoric and sulphuric acids, and in molten alkali. It is as resistant as gold to corrosion and tarnishing. Indeed, platinum will not oxidize in air no matter how strongly it is heated.
Gains of Platinized Anode:-
Energy saving potential
Low weight (in particular expanded metal anodes)
Long service time even at high current density
Dimensional stability, long durability of base material
Replating possible
Higher quality of end product
Application-specific design
