Iridium - tantalum coated titanium electrode is a very good electrode material for oxygen release in acidic medium. This product is applied to organic electrolysis, such as cysteine, glyoxylic acid, succinic acid, etc. It can be used in Cr3+ electrolysis Cr6+ electrolysis of indirect oxidation in organic electrolysis. Sewage treatment is used to oxidize organic matters and toxic substances in water, such as the conversion of CN -; It can also be used as auxiliary electrode in electroplating industry, such as auxiliary anode for Cr plating, auxiliary anode for electrolytic copper, auxiliary anode for electrolytic zinc, auxiliary anode for cathodic protection, etc. Also mainly in the electrolytic electrodeposition of cobalt, nickel applications.
Iridium is chemically stable. Is a corrosion resistant metal, iridium acid chemical stability is very high, insoluble in acid, only the sponge iridium will slowly dissolve in hot water, if it is dense iridium, even boiling water, also can not corrosion iridium; Slightly eroded by molten sodium hydroxide, potassium hydroxide and sodium dichromate. Ordinary etchant cannot corrode iridium. A strong tendency to form complex compounds. The main valences are +2, +4, +6.
USES: pure iridium is specially used in aircraft spark plugs, mostly used in making scientific instruments, thermocouples, resistance wires, etc. Alloys are used to strengthen other metals and resist corrosion. Pure iridium is mostly used in alloys. Iridium is used alone, but rarely in a dense metal form, typically as a spindle, crucible, or filament. Because of the high cost of processing iridium into filamentous material, the market price of iridium wire is as high as 1000 yuan per gram. Therefore, iridium often appears in the form of alloy, which forms an alloy with platinum (10% Ir and 90% Pt). Due to the extremely small expansion coefficient, it is often used to make the international standard meter scale.
