Claims
- 1. A corrosion-resistant steel sheet or strip comprising a base sheet made of a cold rolled steel sheet or strip and a diffusion layer consisting essentially of iron and nickel and having a thickness in the range of 0.3 to 10.9 .mu.m on at least one surface of said base sheet as a top exposed layer, wherein
- said diffusion layer being formed by recrystallizing a nickel layer which has been electroplated on at least one surface of said base sheet;
- said nickel layer having a thickness in the range of about 1 to 5 .mu.m prior to forming said diffusion layer;
- a ratio of said thickness of said diffusion layer to said thickness of said nickel layer prior to forming said diffusion layer being in the range of 10 to 333%;
- an iron exposure rate at the top surface of the top exposed layer is in the range of 4% to 30%.
- 2. A corrosion-resistant steel sheet or strip according to claim 1, wherein said Fe-Ni diffusion layer has a thickness in the range of 0.3-10.3 .mu.m.
- 3. A corrosion-resistant steel sheet or strip according to claim 1, wherein said iron exposure rate is in the range of 4% to 28%.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4-188628 |
Jun 1992 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/078,920, filed Jun. 21, 1993, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (2)
Number |
Date |
Country |
61-235594 |
Oct 1986 |
JPX |
3166388 |
Jul 1991 |
JPX |
Non-Patent Literature Citations (2)
Entry |
Lowenheim, "Electroplating", TS 670, L67, 1978 pp. 211-224. (no month). |
"Handbook of Chemistry and Physics", 54th edition, QD 65.04, 1973 pp. B-113. (no month). |
Continuations (1)
|
Number |
Date |
Country |
Parent |
78920 |
Jun 1993 |
|