Steel product with heat-resistant, corrosion-resistant plating layers

• US 5,422,192 A
• Filed: 09/07/1994
• Issued: 06/06/1995
• Est. Priority Date: 10/06/1989
• Status: Expired due to Term

• Current Assignee: Usui Kokusai Sangyo Kaisha Limited
• Original Assignee: Usui Kokusai Sangyo Kaisha Limited
• Inventors: Takahashi, Teruhisa, Takahata, Seiya
• Primary Examiner(s): WYSZOMIERSKI, GEORGE P
• Application Number:
  US08/301,724
• Time in Patent Office: 272 Days
• Field of Search: 428/621, 428/632, 428/658, 428/659, 428/677, 428/680
• US Class Current: 428/632
• CPC Class Codes: C25D 3/565 containing more than 50% by weight of zinc
• CPC Class Codes: C25D 5/48 After-treatment of electroplated surfaces
• CPC Class Codes: Y10T 428/12611 Oxide-containing component
• CPC Class Codes: Y10T 428/12792 Zn-base component
• CPC Class Codes: Y10T 428/12799 Next to Fe-base component [e.g., galvanized]
• CPC Class Codes: Y10T 428/12924 Fe-base has 0.01-1.7% carbon [i.e., steel]

Abstract

A steel product (or copper-plated steel product) with heat-resistant, corrosion-resistant plating layers which are composed of a 0.2-10 μm thick nickel plating layer formed on said steel product, a Zn-Ni alloy plating layer formed on said nickel plating layer, and a chromate film formed on said Zn-Ni alloy plating layer.

Claims

1. A steel product with heat-resistant, corrosion-resistant plating layers which are composed of a 0.2-10 μ

m thick nickel plating layer formed on said steel product, a Zn-Ni alloy plating layer formed on said nickel plating layer, and as a topcoat a film consisting essentially of chromate formed on said Zn-Ni alloy plating layer.

2. A steel product as claimed in claim 1, wherein the Zn-Ni alloy plating layer contains 2-20% of nickel.

3. A steel product as claimed in claim 1, wherein the Zn-Ni alloy plating layer contains 12-15% of nickel.

4. A steel product plated with copper and with heat-resistant, corrosion-resistant plating layers which are composed of a 0.2-10 μ

m thick nickel plating layer formed on said copper-plated steel product, a Zn-Ni alloy plating layer formed on said nickel plating layer, and as a topcoat a film consisting essentially of chromate formed on said Zn-Ni alloy plating layer.

5. A steel product as claimed in claim 4, wherein the Zn-Ni alloy plating layer contains 2-20% of nickel.

6. A steel product as claimed in claim 4, wherein the Zn-Ni alloy plating layer contains 12-15% of nickel.