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Zinc chromate

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Zinc chromate
Names
IUPAC name Zinc chromate
Identifiers
CAS Number
ECHA InfoCard 100.033.511 Edit this at Wikidata
PubChem CID
RTECS number
  • GB3290000
CompTox Dashboard (EPA)
Properties
Chemical formula ZnCrO4
Molar mass 181.403 g/mol
Appearance yellow-green crystals
Density 3.43 g/cm
Melting point 316 °C
Boiling point 732 °C
Solubility in water insoluble
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazard OX: Oxidizer. E.g. potassium perchlorate
2 0 0OX
Lethal dose or concentration (LD, LC):
LD50 (median dose) 0.5 to 5 g/kg
NIOSH (US health exposure limits):
PEL (Permissible) 0.1 mg/m
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). checkY verify (what is  ?) Infobox references
Chemical compound
B-25 Mitchell bombers, painted with Zinc Chromate undercoat, being assembled, 1942

Zinc chromate, ZnCrO4, is a chemical compound containing the chromate anion, appearing as odorless yellow solid powder. It is used industrially in chromate conversion coatings, having been developed by Ford Motor Company in 1920s. Exposure to zinc chromate can cause tissue ulceration and cancer.

Its use as a corrosion resistant agent was applied to aluminium alloy parts first in commercial aircraft, and then in military ones. During the 1940 and 1950s it was typically found as the "paint" in the wheel wells of retractable landing gear on U.S. military aircraft, not because of its glaring yellow-green color symbolizing anything, but to protect the aluminium from corrosion.

When used as a pigment, it is known as Zinc Yellow, Buttercup Yellow or Yellow 36. It is rarely used in art anymore.

Zinc chromate putty was used as sealant in addition to two O-rings between sections of the failed solid rocket booster on Space Shuttle Challenger, contributing to the loss of the shuttle.

References

  1. ^ "OHSA Chemical Sampling Information for Zinc Chromate". Occupational Safety and Health Administration. Retrieved 24 march 2011. {{cite web}}: Check date values in: |accessdate= (help)
  2. ^ National Oceanic and Atmospheric Administration. "ZINC CHROMATE - CAMEO Chemicals". Retrieved 24 March 2011.
  3. ^ "OHSA Guideline for Zinc Chromate". Occupational Safety and Health Administration. Retrieved 24 March 2011.
  4. Richard P. Pohanish (9 February 2004). HazMat data: for first response, transportation, storage, and security. John Wiley and Sons. p. 1155. ISBN 9780471273288. Retrieved 24 March 2011.
  5. Waligorski, Martin. "Everything You Need to Know About Zinc Chromate". Retrieved 23 March 2011.
  6. "Basic Zinc Chromate". Chemical Land21. Retrieved 24 March 2011.
  7. J.A. Hickman (1997). Polymeric Seals and Sealing Technology. iSmithers Rapra Publishing. p. 25. ISBN 9781859570968. Retrieved 24 March 2011.
Zinc compounds
Zinc(I)
Organozinc(I) compounds
Zinc(II)
Organozinc(II) compounds
  • Zn(CH3)2
  • Zn(C2H5)2
  • Zn(CH3COO)2
  • Zn(CH(CH3)2)2
  • Zn(C(CH3)3)2
  • Zn(C6H5)2
  • Zn(C3H5O3)2
  • ZnICH2I


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