Sodium Dichromate BICHROMATE

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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