Abstract
Calcium oxalate tri-hydrate films have been formed on stainless steel electrodes by polarizing them slightly cathodically in a dilute aqueous solution containing Ca2+ ions and dimethyl oxalate. The solutions were supersaturated with CaC2O4, which was produced as a result of the hydrolysis of dimethyl oxalate and was sparingly soluble. Supersaturation was kept during the film formation. It was found that the electrodeposition rates of CaC2O43H2O were determined by the degree of supersaturation and current density. The degree of the supersaturation which depends on the concentration of reagents and the temperature, influenced on the electrodeposition rate to a greater extent than the current density. The films thus can be formed from the dilute aqueous solutions and at the very low current density.
