Method of plating stainless steel and plated material

• US 9,347,145 B2
• Filed: 05/23/2011
• Issued: 05/24/2016
• Est. Priority Date: 05/24/2010
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Bessho, Takeshi
• Primary Examiner(s): Yang, Jie
• Assistant Examiner(s): Su, Xiaowei
• Application Number:
  US13/699,489
• Publication Number:
  US 20130071688A1
• Time in Patent Office: 1,828 Days
• Field of Search: 148/518
• US Class Current: 1/1
• CPC Class Codes: C23C 28/02 only coatings only including layers of metallic material
• CPC Class Codes: C23C 28/028 Including graded layers in composition or in physical properties, e.g. density, porosity, grain size
• CPC Class Codes: C25D 5/10 Electroplating with more than one layer of the same or of different metals for bearings C25D7/10
• CPC Class Codes: C25D 5/14 two or more layers being of nickel or chromium, e.g. duplex or triplex layers
• CPC Class Codes: C25D 5/34 Pretreatment of metallic surfaces to be electroplated
• CPC Class Codes: C25D 5/36 of iron or steel
• CPC Class Codes: C25D 5/50 by heat-treatment
• CPC Class Codes: C25D 5/619 Amorphous layers
• CPC Class Codes: C25D 7/00 Electroplating characterised by the article coated
• CPC Class Codes: Y10T 428/12944 Ni-base component

Abstract

The method of plating a stainless steel substrate including depositing a first plating metal layer over the stainless steel substrate), forming an interdiffusion layer in which elements of the stainless steel substrate and elements of the first plating metal layer interdiffuse, by applying a heat treatment to the stainless steel substrate coated by the first plating metal layer, and coating a second plating metal layer over the surface of the stainless steel substrate over which the interdiffusion layer is coated.

Claims

1. A method of plating a stainless steel, comprising:

depositing a first plating metal layer over a stainless steel substrate, wherein the plating metal of the first plating metal layer is formed of a boron-containing nickel alloy;

forming an interdiffusion layer in which at least iron and chromium of the stainless steel substrate and nickel and boron of the first plating metal layer interdiffuse, by applying a heat treatment to the stainless steel substrate coated by the first plating metal layer; and

depositing a second plating metal layer over the stainless steel substrate having the interdiffusion layer formed therein, wherein the second plating metal layer is formed of phosphorous-containing nickel,

wherein the stainless steel is selected from the group consisting of ferritic stainless steel, austenitic stainless steel and martensitic stainless steel, and

wherein the stainless steel substrate is heated at 300°

C. or lower after deposition of the second plating metal layer.

2. The method according to claim 1,

wherein the elements of the stainless steel substrate diffuse through the entirety of first plating metal layer during formation of the interdiffusion layer.

3. The method according to claim 1, further comprising:

removing a passivation film that is formed on a surface of the stainless steel substrate by electrolytic plating and depositing a plating metal layer of the same kind of plating metal as the first plating metal layer before the first plating metal layer is deposited.

4. The method according to claim 1,

wherein the stainless steel substrate is formed of an austenitic stainless steel, and the heat treatment is applied by heating the stainless steel substrate at a temperature in a range of 800°

C. to 1100°

C. in the forming of the interdiffusion layer.

5. The method according to claim 1, wherein the stainless steel substrate is heated at 150°

C. or higher after deposition of the second plating metal layer.

6. The method according to claim 1, further comprising:

etching the stainless steel substrate having the interdiffusion layer before the second plating layer is deposited.