Dissimilar metal joined material and method of manufacturing same

Patent metadata

Field	Value
Publication number	US-2019337086-A1
Application number	US-201916386672-A
Country	US
Kind code	A1
Filing date	Apr 17, 2019
Priority date	May 2, 2018
Publication date	Nov 7, 2019
Grant date	—

Abstract

An object of the present invention is to provide a dissimilar metal joined material that has corrosion resistance that can prolong life resulting from corrosion and has a small difference from original characteristics. There is provided a dissimilar metal joined material including: a clad material including a high thermal expansion layer composed of an alloy containing Mn, and a low thermal expansion layer composed of an alloy containing Ni, the low thermal expansion layer being joined directly to the high thermal expansion layer or via an intermediate layer; and a corrosion resistant plating layer provided on at least a surface of the high thermal expansion layer, the corrosion resistant plating layer having a thickness of 10 nm to 120 nm.

First claim

1 . A dissimilar metal bonded material comprising:
a clad material comprising:
a high thermal expansion layer composed of an alloy containing Mn, and
a low thermal expansion layer composed of an alloy containing Ni, the low thermal expansion layer being joined directly to the high thermal expansion layer or joined via an intermediate layer; and
a corrosion resistant plating layer provided on at least a surface of the high thermal expansion layer, the corrosion resistant plating layer having a thickness of 10 nm to 120 nm.

2 . The dissimilar metal bonded material according to claim 1 , wherein
the corrosion resistant plating layer is any one of a Ni plating layer, a Ni—B plating layer, a Ni-trivalent Cr plating layer, or a Ni—P plating layer.

3 . The dissimilar metal joined material according to claim 2 , wherein
the corrosion resistant plating layer is a Ni plating layer.

4 . The dissimilar metal joined material according to claim 1 , further comprising an identification mark provided on a surface thereof.

5 . A method of manufacturing a dissimilar metal joined material, the method comprising the successive steps of:
degreasing surfaces of a clad material comprising: a high thermal expansion layer composed of an alloy containing Mn and a low thermal expansion layer composed of an alloy containing Ni, the low thermal expansion layer being joined directly to the high thermal expansion layer or joined via an intermediate layer; washing at least the surface of the high thermal expansion layer; plating at least the surface of the high thermal expansion layer with a plating solution to form a corrosion resistant plating layer having a thickness of 10 nm to 120 nm; removing the plating solution from the surface of the high thermal expansion layer; and drying the dissimilar metal joined material.

6 . The method of manufacturing a dissimilar metal joined material according to claim 5 ,
wherein the plating solution has a pH of 4.5 to 6.0.

Assignees

• Hitachi Metals Ltd

Inventors

• Nishimura Junko

Classifications

• H01H2037/526

  Materials for bimetals · CPC title

• H01H2037/525

  Details of manufacturing of the bimetals, e.g. connection to non bimetallic elements or insulating coatings · CPC title

• B23K2103/18

  Dissimilar materials · CPC title

• B23K20/04 Primary

  by means of a rolling mill · CPC title

• B32B15/01 Primary

  all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)} · CPC title