METHOD FOR APPLYING LAMINATE CORROSION RESISTANT COATING ON STEEL PARTS Russian patent published in 2008 - IPC C25D5/14 

FIELD: electroplating processes and equipment, possibly application of corrosion resistant laminate coatings on surfaces of steel parts used in chemical electric current sources.

SUBSTANCE: method comprises steps of preparing surface of articles for electroplating; at preparation stage and before each cycle of electroplating performing in addition cathode-anode treatment of articles in aqueous solution of H₂SO₄ (20%); applying first layer from nickel plating electrolyte containing, g/l: NiSO₄ x 7H₂O, 140 - 250; Na₂SO₄ x 10 H₂O, 50 - 100; MgSO₄ x 7H₂O, 10 - 20; H₃BO₃, 25 - 35; NaCl, 10 - 20; at electric current density D = 2 A/dm², t = 25°C. Second layer is applied from copper plating electrolyte containing, g/l: CuSO₄, 250 -300;H₂SO₄, 50-75; C₂H₅OH, 5 - 10, at electric current density D = 1 - 2 A/dm², t = 25°C. Third layer is applied from above mentioned nickel plating electrolyte for further drying of articles at 80 -100°C.

EFFECT: improved quality of protection coating, enhanced electric parameters of such coating in medium of melt of carbonate compounds in chemical current sources structure.

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