Production of hard and heat-resistant coatings on aluminium using a plasma micro-discharge

Oxide structures were synthesized on aluminium alloy surfaces as the anode under plasma discharges conditions. Aqueous solutions containing ions of an organic acid were used as electrolytes. It was ascertained that the amorphous coatings obtained have a significant microhardness and heat-resistance up to 870°C. On the basis of experimental data obtained by thermogravimetric analysis, X-ray analysis and laser mass-spectroscopy methods, conclusions about the formed oxide layer compositions were made.