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Method for Producing a Chromium Coating and a Coated Object

  • US 20160333494A1
  • Filed: 01/15/2014
  • Published: 11/17/2016
  • Est. Priority Date: 01/15/2014
  • Status: Active Grant
First Claim
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1. A method for producing a chromium coating on an object by trivalent chromium plating, the method comprising the steps of:

  • depositing a layer of nickel phosphorus alloy (NiP) on the object;

    depositing an intermediate layer on the NiP layer, the intermediate layer consisting of another metal or metal alloy or ceramic;

    depositing a layer of chromium from a trivalent chromium bath on the intermediate layer; and

    subjecting the coated object to one or more heat treatments to harden the coating and to produce multiphase layers comprising at least one layer containing crystalline Ni and crystalline Ni3P and at least one layer containing crystalline Cr.

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