METHOD OF METALLIC COATING APPLICATION FROM PLATINUM OR IRIDIUM ON PRODUCTS FROM ALUMINA CERAMICS Russian patent published in 2010 - IPC C23C18/42 

FIELD: metallurgy.

SUBSTANCE: invention relates to application of coatings from noble metals, particularly to platinum and iridium on ceramic and can be used for receiving of protective coatings with high chemical stability in liquid and gaseous corrosive medium. Method includes application of coating on preliminary degreased and activated surface of product by means of chemical reduction of metal from water solution, containing ammonia complex of metal and 0.56 g/l potassium hydroxide, at temperature 170 - 210 °C in confined space during 130 - 180 min., herewith used aqueous solution is previously vacuumised during 20 - 30 min. and is saturated by nitrogen for removing of molecular oxygen. In the capacity of metal complex it is used tetramin platinum chloride (II) or pentammin iridium chloride (III), which are taken from consideration 0.003 g of metal per 1 cm² of product surface, herewith operation of chemical reduction of metal is replicated multiple. After each two sequential operations of chemical reduction of metal product is heated at 550 - 650 °C during 4 h.

EFFECT: invention provides receiving of solid, uniform, temperature-stable, plastic coating of platinum or iridium of thickness up to 5 mcm on ceramics.

2 cl, 7 ex