Hexafluorozirconic acid

Hexafluorozirconic acid
Names
Other names
  • Dihydrogen hexafluoridozirconate
  • Fluorozirconic acid
  • Hydrogen hexafluorozirconate(IV)
  • Hydrogen zirconium fluoride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.502
EC Number
  • 234-666-0
  • InChI=1S/6FH.Zr/h6*1H;/q;;;;;;+4/p-4
    Key: DXIGZHYPWYIZLM-UHFFFAOYSA-J
  • [H+].[H+].F[Zr-2](F)(F)(F)(F)F
Properties
F6H2Zr
Molar mass 207.230 g·mol−1
Appearance white solid[1]
soluble[1]
Hazards
GHS labelling:[2]
GHS05: CorrosiveGHS06: Toxic
Danger
H290, H301, H311, H314, H331
Related compounds
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Hexafluorozirconic acid is an inorganic compound with the idealized chemical formula H2ZrF6 that exists in solution. Hydroxonium hexafluorozirconate ((H3O)2ZrF6) is a white solid forming monoclinic crystals.

Structure

Hydroxonium hexafluorozirconate has been characterized by X-ray diffraction.[3] It forms monoclinic crystals (space group: A2/a, a = 6.715 Å, b = 7.187 Å, c = 12.626 Å, γ = 111.85°, Z = 4). It is composed of chains of (ZrF6)2-
n, located in parallel to each other along coordinate axis x, and H3O+ cations.

Preparation

Hexafluorozirconic acid can be prepared by treating zirconium(IV) oxide with hydrofluoric acid.[1] White crystals form upon evaporation of the solution.

Uses

Hexafluorozirconic acid can be used in sealing treatments for phosphated steel. A dilute solution of trimethoxymethylsilane, with enough H2ZrF6 to bring the pH down to about 4, is reported to perform better than a chromate rinse.[4] A nickel and chromium(VI) free treatment system for steel and galvanized steel is carried out by washing with an alkaline cleaner, rinsing, treating with hexafluorozirconic acid, rinsing, and then sealing with a solution of epoxy phosphate.[4]

References

  1. 1 2 3 Ramanathan, E.; Balasubramanian, S. (2016-10-25). "Synthesis and characterization of hexafluorozirconic acid powder and its application in nanoceramic coating". Surface and Coatings Technology. 304: 228–236. doi:10.1016/j.surfcoat.2016.07.009. ISSN 0257-8972.
  2. ↑ "ECHA CHEM". chem.echa.europa.eu. Retrieved 2026-03-16.
  3. ↑ Davidovich, R L; Gerasimenko, A V; Bukvetskij, B V; Logvinova, V B; Buslaev, Yu A (January 1, 1987). "Crystal structure of hydroxonium hexafluorozirconate". Koord. Khim.; (USSR). 13:5. Retrieved April 20, 2026.
  4. 1 2 Wicks, Zeno W.; Jones, Frank N.; Pappas, S. Peter; Wicks, Douglas A. (2007-01-10). Organic Coatings: Science and Technology (1 ed.). Wiley. p. 144. doi:10.1002/9780470079072.ch7. ISBN 978-0-471-69806-7.

Further reading

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