Claims
- 1. A black-colored zinc composite-plated steel sheet which comprises a steel sheet or a plated steel sheet, a colored composite-plating film produced by cathodic electrolyzation, comprising metallic zinc or a zinc alloy and an oxide(s) or hydrated oxide(s) of a coloring metal (Me) and zinc at a coverage of 0.1 to 5 g/m.sup.2 provided on said steel sheet and a transparent top coat of 3 .mu.m or less thick provided on said colored composite-plating film, said coloring metal (Me) is selected from the group consisting of Ni, Fe and mixtures thereof.
- 2. A colored zinc composite-plated steel sheet according to claim 1 which further includes as additional coloring metal a member selected from the group consisting of Co, Cr, Sn, Cu and mixtures thereof.
- 3. A colored zinc composite-plated steel sheet according to claim 1 wherein the top coat is selected from the group consisting of a film chemically formed in situ, resin film, inorganic polymer film, composite film of inorganic polymer and resin, oil, fat, wax, and combinations thereof.
- 4. A colored zinc composite-plated steel sheet according to claim 3 wherein the film chemically formed in situ is a chromate film chemically formed in situ, a phosphate film, or a chelate film.
- 5. A colored zinc composite-plated steel sheet according to claim 3 wherein the film chemically formed in situ, is a chromate film containing phosphoric acid.
- 6. A colored zinc composite-plated steel sheet according to claim 3 wherein the resin film contains a chromium compound, an oxide selected from the group consisting of silica, titania, alumina and zirconia; a silicate mineral selected from the group consisting of mica and talc; an inorganic compound selected from the group consisting of a phosphate and a borate; a fatty acid soap, carbon, a fatty acid ester, silane coupling agent and titanium coupling agent.
- 7. A colored zinc composite-plated steel sheet according to claim 1 wherein the steel sheet or the plated steel sheet has a gloss finish with an average surface roughness of 1.0 .mu.m or less.
- 8. A colored zinc composite-plated steel sheet according to claim 1 wherein the steel sheet or the plated steel sheet has a semigloss finish with an average surface roughness of 1.5 .mu.m or more.
- 9. A colored zinc composite-plated steel sheet according to claim 1 which comprises the colored composite-plating film comprising zinc and coloring metal oxide provided on said steel sheet or plated steel sheet at a coverage of 0.5-2.0 g/m.sup.2, a chromate film provided on said film and a composite film comprising silica and an organic resin having a thickness of 0.5-2 .mu.m provided on said chromate film.
- 10. A colored zinc composite-plated steel sheet according to claim 1 wherein the colored composite-plating film contains a condensed phosphate.
Priority Claims (3)
Number |
Date |
Country |
Kind |
61-192613 |
Aug 1986 |
JPX |
|
61-208863 |
Sep 1986 |
JPX |
|
61-299200 |
Dec 1986 |
JPX |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
This is a divisional of co-pending application Ser. No. 07/084,727 filed Aug. 12, 1987, now U.S. Pat. No. 4,861,441, and entitled "Black Surface Treated Steel Sheet and Method of Making the Same".
US Referenced Citations (9)
Foreign Referenced Citations (1)
Number |
Date |
Country |
143582 |
Jul 1986 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Jitsumu Hyomen Gijutsu, vol. 35, No. 10, 1985, pp. 541-542. |
Divisions (1)
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Number |
Date |
Country |
Parent |
84727 |
Aug 1987 |
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