Dichromates are power oxidizing agents which find applications in:

• Chromium source in preparing chromium compounds
• Leather tanning and screen printing
• Electroplating
• Pyrotechnics and explosives
• Pigment preparation
• Wood Preservative
• Metal Treating and corrosion inhibitor
• Oil drilling
• Catalyst for the chromium metal production
• Photographic engraving

In biological field, potassium dichromate is used as a fixative for used for conservation of tissue sections. 

After thorough cleaning, the stainless steel part is ready for immersion in a passivating acid bath. Any one of three approaches can be used--nitric acid passivation, nitric acid with sodium dichromate passivation and citric acid passivation. Which approach to use depends on the grade of stainless steel and prescribed acceptance criteria.

10588-01-9 (Anhydrous)
7789-12-0   (Dihydrate)

PHYSICAL AND CHEMICAL PROPERTIES
 
PHYSICAL STATE              Odorless Orange to Red crystals or granules
MELTING POINT                357 C
BOILING POINT                 400 C
 
SPECIFIC GRAVITY           2.35
SOLUBILITY IN WATER Highly soluble (74.0% at 25°C)
 
pH                                         3.0 - 4.6 upon concentration
 
VAPOR DENSITY               10

NFPA RATINGS
 Health: 4; Flammability: 0; Reactivity: 2; Special Hazard: OX

FLASH POINT                    400 C
 
STABILITY                           Stable under ordinary conditions 

More resistant chromium-nickel grades can be passivated in a 20 percent-by-volume nitric acid bath . As indicated in the same table, less resistant stainless grades can be passivated by adding sodium dichromate to the nitric acid bath to make the solution more oxidizing and capable of forming a passive film on the surface.

Another option, used in place of nitric acid plus sodium dichromate, is to increase the concentration of nitric acid to 50 percent-by-volume , The sodium dichromate addition and lit : higher nitric acid concentration both reduce the chance of undesirable flash attack.

APPEARANCE             :: Odourless orange crystal grain
Na2Cr2O7· 2H2O       :: 98.0% min
SULPHATES                :: 0.4% max
CHLORIDES                :: 0.2% max 

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