Application

The Uses of Sodium Dichromate

The major applications of sodium dichromate are to produce sodium dichromate (an important precursor to most chromium compounds) and the extraction of chromium metal from its ores. And the other application of sodium dichromate is:

Metallurgy Industry
Sodium dichromate is used to improve the corrosion resistance of various coatings on metals. They are used in etching and bright-dipping of copper and its alloys. In addition to this, they are used to prevent metal corrosion in recirculating water systems. It is used as corrosion inhibitor for cooling systems in locomotive diesels and automobiles.

Environmental Usage
It is used in fire-retardant formulations to prevent leaching of the fire retardant from the wood and corrosion of the equipment that is used. After impregnation of wood the sodium dichromate compound used in formulation, react with the wood extractives and the other preservatives salts to produce relatively insoluble complexes from which preservatives leaches only very slowly.

Other Applications
Sodium dichromate is used as an oxidant and source of chromium in textile industry to dye wool and synthetics with mordent acid dyes, oxidized vat dyes and indigo sol dyes on wool. It is used in petroleum and natural gas industries for drilling muds. It is also used in pharmaceuticals like Brufen drugs. It can be used to manufacture saccharine. It is used as a ferromagnetic material in high fidelity magnetic tapes and is also used for hardening gelatin. Further it used in electric batteries, bleaching fats, oil sponges and resins. Moreover, it is used as an oxidizing agent in manufacturing of dyes, many other synthetic chemicals, and ink. It is used in the manufacturing of chromic acid and chrome pigments.

Hazard

As a hexavalent chromium chemical, sodium chromate is highly toxic and carcinogenic (causes cancer). It is also corrosive and causes a burning sensation in eyes and skin. It is very harmful when swallowed and causes diarrhea, shock and liver damage. When heated, it decomposes to give toxic chromium oxide fumes, which are also very irritating to eyes, skin and mucous membranes.