Strontium chromate

Strontium chromate is an inorganic chemical compound with the formula SrCrO4.

Strontium chromate
Names
Other names
C.I. Pigment Yellow 32
C.I. 77839
Identifiers
3D model (JSmol)
ECHA InfoCard 100.029.220
EC Number
  • 232-142-6
RTECS number
  • GB3240000
UNII
  • InChI=1S/Cr.4O.Sr/q;;;2*-1;+2
    Key: NVKTUNLPFJHLCG-UHFFFAOYSA-N
  • [O-][Cr](=O)(=O)[O-].[Sr+2]
Properties
SrCrO4
Molar mass 203.614 g/mol
Appearance yellow powder
Density 3.353 g/cm3
0.12 g/100 mL (15 °C)
3 g/100 mL (100 °C)
Solubility Soluble in dilute acids and ammonia
−5.1·10−6 cm3/mol
Structure
monoclinic
Hazards
Lethal dose or concentration (LD, LC):
3118 mg/kg (rat, oral)
Related compounds
Other cations
 Magnesium chromate
Barium chromate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Preparation

Strontium chromate is prepared from strontium chloride and sodium chromate, or from strontium carbonate and sodium dichromate.

Reactions

Strontium chromate is approximately 30 times more soluble in water at 100 °C than at room temperature. Therefore, the yellow strontium chromate can be suspended in a hot solution of a soluble sulfate to digest until fully converted to the much less soluble and white strontium sulfate, leaving the chromate or dichromate in solution.

Uses
  • Corrosion inhibitor in pigments
  • In electrochemical processes to control sulphate concentration of solutions
  • Colorant in polyvinyl chloride resins
  • Pyrotechnics[1]
  • Aluminium flake coatings
  • As an anti-corrosive primer for zinc, magnesium, aluminium, and alloys used in aircraft manufacture.
  • As a pigment used in oil painting named strontium yellow.[1]

References
  1. "Strontium yellow". CAMEO database. Museum of Fine Arts, Boston. 2022-06-06. Retrieved 2023-02-14.
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