Surface treated steel product prepared by tin-based plating or aluminum-based plating

• US 6,649,282 B1
• Filed: 12/26/2001
• Issued: 11/18/2003
• Est. Priority Date: 03/19/1999
• Status: Expired due to Term

• Current Assignee: Nippon Steel Corporation
• Original Assignee: Nippon Steel Corporation
• Inventors: Sugiyama, Seiji, Yamaguchi, Shinichi, Maki, Jun, Kurosaki, Masao, Sato, Hisaaki, Shindo, Hidetoshi, Izaki, Teruaki
• Primary Examiner(s): Koehler, Robert R.
• Application Number:
  US09/937,007
• Time in Patent Office: 692 Days
• Field of Search: 428/648, 428/646, 428/650, 428/653, 428/621, 428/626, 428/628, 428/630, 428/926, 428/933, 428/939
• US Class Current: 428/648
• CPC Class Codes: C22C 13/00 Alloys based on tin
• CPC Class Codes: C22C 21/02 with silicon as the next major constituent
• CPC Class Codes: C22C 21/10 with zinc as the next major constituent
• CPC Class Codes: C23C 2/08 Tin or alloys based thereon
• CPC Class Codes: C23C 2/12 Aluminium or alloys based thereon
• CPC Class Codes: Y10S 428/926 Thickness of individual layer specified
• CPC Class Codes: Y10S 428/933 Sacrificial component
• CPC Class Codes: Y10S 428/939 Molten or fused coating
• CPC Class Codes: Y10T 428/12535 with additional, spatially distinct nonmetal component
• CPC Class Codes: Y10T 428/12569 Synthetic resin
• CPC Class Codes: Y10T 428/12583 Component contains compound of adjacent metal
• CPC Class Codes: Y10T 428/12597 Noncrystalline silica or noncrystalline plural-oxide component [e.g., glass, etc.]
• CPC Class Codes: Y10T 428/12708 Sn-base component
• CPC Class Codes: Y10T 428/12722 Next to Group VIII metal-base component
• CPC Class Codes: Y10T 428/12736 Al-base component
• CPC Class Codes: Y10T 428/12757 Fe

Abstract

A tin-plating or aluminum-plating surface treated steel material with excellent corrosion resistance containing an intermetallic compound composed of one or more Group IIa (alkaline earth metal) elements and one or more Group IVb elements in a tin-based plating layer or aluminum-based plating layer on the surface of a steel material. For a tin-based plating layer, the long diameter of the intermetallic compound massive bodies is 1 82 m or greater and the short diameter/long diameter ratio is at least 0.4. For an aluminum-based plating layer, the long diameter of the intermetallic compound massive bodies is 10 μm or greater and the short diameter/long diameter ratio is at least 0.4.

Claims

1. A tin-plating surface treated steel material with excellent corrosion resistance, characterized by containing an intermetallic compound composed of one or more Group IIa (alkaline earth metal) elements and one or more Group IVb elements in a tin-based plating layer on the surface of a steel material.

2. A tin-plating surface treated steel material with excellent corrosion resistance according to claim 1, wherein said intermetallic compound is a compound composed of at least one element of Mg and Ca of Group IIa and at least one element of Si and Sn of Group IVb.

3. A tin-plating surface treated steel material with excellent corrosion resistance according to claim 1 wherein said intermetallic compound is in the form of massive bodies with a long diameter of 1 μ

m or greater and a short diameter/long diameter ratio of 0.4 or greater.

4. A tin-plating surface treated steel material with excellent corrosion resistance according to claim 1, wherein the component composition of said tin-based plating layer is, in terms of weight percentage, either or both Mg and Ca in ranges of Mg:

0.2-10% and Ca;

0.01-10%, with the remainder Sn and unavoidable impurities.

5. A tin-plating surface treated steel material with excellent corrosion resistance according to claim 1, wherein the component composition of said tin-based plating layer is, in terms of weight percentage, either or both Mg and Ca in ranges of Mg:

0.2-10% and Ca;

0.01-10%, with Al in the range of 0.01-10%, and the remainder Sn and unavoidable impurities.

6. A tin-plating surface treated steel material with excellent corrosion resistance according to claim 4, wherein said tin-based plating layer further contains, in terms of weight percentage, Zn:

1-40% and/or Si;

0.1-0.5%.

7. A tin-plating surface treated steel material with excellent corrosion resistance according to claim 1, wherein the thickness of the plating layer on the steel material surface is 2-100 μ

m.

8. A tin-plating surface treated steel material with excellent corrosion resistance according to claim 1, wherein the roughness of the plating surface is no greater than 3 μ

m in terms of Ra.

9. A tin-plating surface treated steel material with excellent corrosion resistance according to claim 1, wherein an alloy layer with a thickness of no greater than 5 μ

m is present at the interface between the plating layer and the steel material.

10. A tin-plating surface treated steel material with excellent corrosion resistance according to claim 1, having at least one of a pre-plating layer containing one or more from among Ni, Co, Zn, Sn, Fe and Cu, an alloy layer of said pre-plating layer and the basis iron, and an alloy layer of said pre-plating layer and the plating layer.

11. A tin-plating surface treated steel material with excellent corrosion resistance according to claim 1, containing one or more added elements from among Ni, Co, Zn, Sn, Cu, Bi, Sb, misch metal, Fe, Be, Cr and Mn, as a plating layer component.

12. A tin-plating surface treated steel material with excellent corrosion resistance accordance to claim 1, having a post-treatment coating on the uppermost surface of the steel material.