Electrodeposition of Dense Chromium Coatings from Molten Salt Electrolytes.
Interim rept. no. 1, Oct-Nov 87,
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE VITRY-SUR-SEINE (FRANCE)
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The research under this contract is conducted at the Faculte de Jussieu for all work related to fundamental electrochemistry or electrocrystallization of chrome in a pyrogenic environment. During this period of development, a research student under Dr. Lantelmes direction has been mastering the quality of the cell atmosphere and the molten KC1-LiC1 bath treatment, to avoid any trace of oxide. The salt is treated in situ by dipping in chlorine. One major risk of contamination stems from the introduction of chromium salts in the bath. To avoid this disadvantage we have developed a device generating chromium salt in the electrolyte by electrochemical process. The chromium II ions are formed by anodic oxidation of a piece of very pure chrome Johnson Mathey. The counter electrode is in this case a chlorine electrode, specially developed at the laboratory, on which the chlorine gas can be reduced at a current density of one ampere per square centimeter. Keywords France.
- Physical Chemistry
- Coatings, Colorants and Finishes