An X-ray diffraction study of the structure of di- and trichromate ions in solutions used for electrochemical chromium deposition

Tamás Radnai, Csaba Dorgai

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6 Citations (Scopus)

Abstract

An X-ray diffraction study was carried out in order to identify the predominant species in the CrO3-H2O system and industrial chromium electroplating bath. Structural parameters in terms of coordination numbers, average atom-atom distances and their mean square deviations were determined. Since the presence and distribution of polychromate molecules may have a significant effect on the bulk water structure, the di- and trichromate ratio can be evaluated only by having initially set certain solvent structure. Structural analysis performed by geometrical model construction and fitting it by means of a least-squares method to the experimental data, showed that dichromate ions have the maximum likelihood, but linear-shaped trichromate ions may also exist in significant concentration. It was confirmed that the industrial electrolyte does not contain unwanted, extremely stable [Cr(H2O)]3+ complex.

Original languageEnglish
Pages (from-to)1239-1245
Number of pages7
JournalElectrochimica Acta
Volume37
Issue number7
DOIs
Publication statusPublished - Jun 1992

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Keywords

  • X-ray diffraction
  • chromium deposition
  • dichromate ions
  • trichromate ions

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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