FIELD: mechanical engineering. SUBSTANCE: method includes grooving to desired size, polishing, and applying chromium-containing layer by way of handling rotating ring by cathode-anode technique in 28-40% chromium nitrate aqueous solution until roughness of surface Ra = 0.45-1.50 mcm is achieved at ring rotation speed 0.010-0.015 m/s. EFFECT: enhanced efficiency of process. 1 tbl
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