PROCESS OF DEPOSITION OF PROTECTIVE COATS ON ARTICLES Russian patent published in 1996 - IPC

FIELD: mechanical engineering. SUBSTANCE: invention deals mainly with manufacture of elements of flow parts of power plants operating in corrosive environment. Nickel coat 5.0-7.0 μ thick is first deposited by electroplating on surface of article made from dispersion-hardening alloy then copper coat 20.0-25.0 m thick is deposited followed by thermal treatment in three stage. At first stage coat is kept at temperature 350-400 C for the course of 1.5-2.0 h, at second stage treatment continues at temperature 750-800 C for the course of 1.5-2.0 h and finally at third stage it is treated for the course of 5-10 min at 1010-1020 C. Cooling from this temperature down to 600-650 C is carried out in flow of inert gas with rate 50-70 C/min. EFFECT: protected articles are serviceable in atmosphere of gaseous hydrogen and moisture. 2 tbl