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Method for Producing Chromium-Containing Multilayer Coating and a Coated Object

  • US 20160333493A1
  • 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-containing multilayer coating on an object, comprising the steps of:

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

    electroplating a layer of trivalent chromium on the object;

    repeating said steps one or more times in order to produce a multilayer coating containing two or more alternate layers of nickel-phosphorus alloy and chromium; and

    subjecting the coated object to one or more heat treatments to amend the mechanical and physical properties of the coating and to produce multiphase layers containing crystalline Ni and crystalline Ni3P and multiphase layers containing crystalline Cr.

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