Passivation of Micro-Discontinuous Chromium Deposited From a Trivalent Electrolyte

摘要

A method of treating a substrate, wherein the substrate comprises a layer deposited from a trivalent chromium electrolyte, is described. The method includes the steps of providing an anode and the chromium(III) plated substrate as a cathode in an electrolyte comprising (i) a trivalent chromium salt; and (ii) a complexant; and passing an electrical current between the anode and the cathode to passivate the chromium(III) plated substrate. The substrate may be first plated with a plated nickel layer so that the chromium(III) plated layer is deposited over the nickel plated layer.

主权项

1. A method of treating a substrate, wherein the substrate comprises a plated layer comprising chromium deposited from a trivalent chromium electrolyte, the method comprising the steps of:
(a) providing an anode and the substrate as a cathode in an electrolyte comprising (i) a trivalent chromium salt; and (ii) a complexant; (b) passing an electrical current between the anode and the cathode to deposit a passivate film on the substrate.