Steel sheet having organic coating and method for manufacturing the same

• US 20030072962A1
• Filed: 04/04/2002
• Published: 04/17/2003
• Est. Priority Date: 05/30/2000
• Status: Abandoned Application

• Current Assignee: NSK Corporation (NSK Limited)
• Original Assignee: NSK Corporation (NSK Limited)
• Inventors: Yamashita, Masaaki, Matsuzaki, Akira, Ando, Satoru, Kubota, Takahiro, Yoshimi, Naoto
• Application Number:
  US10/116,594
• Publication Number:
  US 20030072962A1
• Time in Patent Office: Days
• US Class Current: 428/623
• CPC Class Codes: B05D 2202/00 Metallic substrate
• CPC Class Codes: B05D 7/51 One specific pretreatment, e.g. phosphatation, chromatation, in combination with one specific coating pretreatment of metallic substrates C23C; pretreatment before coating in general B05D3/00
• CPC Class Codes: C23C 22/18 containing manganese cations
• CPC Class Codes: C23C 22/20 containing aluminium cations
• CPC Class Codes: C23C 22/22 containing alkaline earth metal cations
• CPC Class Codes: C23C 28/00 Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
• CPC Class Codes: C23C 28/321 with at least one metal alloy layer
• CPC Class Codes: C23C 28/322 only coatings of metal elements only
• CPC Class Codes: C23C 28/3225 with at least one zinc-based layer
• CPC Class Codes: C23C 28/345 with at least one oxide layer
• CPC Class Codes: Y10T 428/12549 Adjacent to each other
• CPC Class Codes: Y10T 428/12618 Plural oxides
• CPC Class Codes: Y10T 428/12757 Fe
• CPC Class Codes: Y10T 428/12799 Next to Fe-base component [e.g., galvanized]
• CPC Class Codes: Y10T 428/31529 Next to metal

Abstract

Steel sheet having organic coating comprises: a zinc or a zinc alloy plated steel sheet or an aluminum or an aluminum alloy plated steel sheet; a composite oxide coating formed on the surface of the plated steel sheet and containing at least one metal selected from the group consisting of Mn and Al; and an organic coating formed on the composite oxide coating and containing a rust-preventive additive component.

Claims

1. A steel sheet having organic coating, comprising:

a zinc or a zinc alloy plated steel sheet or an aluminum or an aluminum alloy plated steel sheet;

a composite oxide coating formed on the surface of the plated steel sheet and containing at least one metal selected from the group consisting of Mn and Al; and

an organic coating formed on the composite oxide coating and containing at least one rust-preventive additive component selected from the group consisting of (a) through (i),

(a) a Ca ion exchanged silica and a phosphate,

(b) a Ca ion exchanged silica, a phosphate, and a silicon oxide,

(c) a calcium compound and a silicon oxide,

(d) a calcium compound, a phosphate, and a silicon oxide,

(e) a molybdenate,

(f) at least one organic compound selected from the group consisting of a triazole, a thiol, a thiadiazole, a thiazole, and a thiuram,

(g) at least one substance selected from the group consisting of calcium and calcium compounds,

(h) at least one compound selected from the group consisting of a phosphate and a silicon oxide, and

(i) a Ca ion exchanged silica.

2. The steel sheet of claim 1, wherein said at least one rust-preventive additive component is:

(e) a molybdenate,

(g) at least one substance selected from the group consisting of calcium and a calcium compound, and

(h) at least one compound selected from the group consisting of a phosphate and a silicon oxide.

3. The steel sheet of claim 1, wherein said at least one rust-preventive additive component is:

(e) a molybdenate, and

(i) a Ca ion exchanged silica.

4. The steel sheet of claim 1, wherein said at least one rust-preventive additive component is:

(f) at least one organic compound selected from the group consisting of a triazole, a thiol, a thiadiazole, a thiazole, and a thiuram,

(g) at least one substance selected from the group consisting of calcium and a calcium compound, and

(h) at least one compound selected from the group consisting of a phosphate and a silicon oxide.

5. The steel sheet of claim 1, wherein said at least one rust-preventive additive component is:

(f) at least one organic compound selected from the group consisting of a triazole, a thiol, a thiadiazole, a thiazole, and a thiuram, and

(i) a Ca ion exchanged silica.

6. The steel sheet of claim 1, wherein said at least one rust-preventive additive component is:

(e) a molybdenate, and

(f) at least one organic compound selected from the group consisting of a triazole, a thiol, a thiadiazole, a thiazole, and a thiuram.

7. The steel sheet of claim 1, wherein said at least one rust-preventive additive component is:

(e) a molybdenate,

(f) at least one compound selected from the group consisting of a triazole, a thiol, a thiadiazole, a thiazole, and a thiuram,

(g) at least one substance selected from the group consisting of calcium and a calcium compound, and

(h) at least one compound selected from the group consisting of a phosphate and a silicon oxide.

8. The steel sheet of claim 1, wherein said at least one rust-preventive additive component is:

(e) a molybdenate,

(f) at least one organic compound selected from the group consisting of a triazole, a thiol, a thiadiazole, a thiazole, and a thiuram, and

(i) a Ca ion exchanged silica.

9. The steel sheet of claim 1, wherein the composite oxide coating has a thickness of from 0.005 to 3 μ

m.

10. The steel sheet of claim 1, wherein the composite oxide coating contains:

(α

) oxide fine particles,

(β

) at least one substance selected from the group consisting of a phosphate and a phosphoric acid compound, and

(γ

) at least one metal selected from the group consisting of Mn and Al.

11. The steel sheet of claim 10, wherein the component (α

) contained in the composite oxide coating is a silicon oxide.

12. The steel sheet of claim 10, wherein the composite oxide coating further contains an organic resin.

13. The steel sheet of claim 1, wherein the organic coating has a thickness of from 0.1 to 5 μ

m.

14. The steel sheet of claim 1, wherein

the organic coating contains a reaction product (X) and the rust-preventive additive component (Y), said reaction product (X) being obtained from a reaction between a film-forming organic resin (A) and an activated-hydrogen-containing compound (B), at least a part of the compound (B) comprising a hydrazine derivative (C) containing activated hydrogen;

and

the content of the rust-preventive additive component (Y) is from 1 to 100 parts by weight (solid matter) to 100 parts by weight (solid matter) of the reaction product (X).

15. The steel sheet of claim 14, wherein the organic coating further contains a solid lubricant (Z), and the content of the solid lubricant (Z) is from 1 to 80 parts by weight (solid matter) to 100 parts by weight (solid matter) of the reaction product (X).

16. The steel sheet of claim 1, wherein the film-forming organic resin (A) is a resin (D) containing epoxy group.

17. The steel sheet of claim 14, wherein the hydrazine derivative (C) containing activated hydrogen is a pyrazole compound containing activated hydrogen and/or a triazole compound containing activated hydrogen.

18. The steel sheet of claim 14, wherein the content of the hydrazine derivative (C) containing activated hydrogen in the compound (B) containing activated hydrogen is from 10 to 100 mole %.

19. The steel sheet of claim 16, wherein the resin (D) containing epoxy group is an epoxy resin expressed by a formula of:

20. The steel sheet of claim 1, wherein the organic coating consists essentially of an organic polymer resin (A) containing OH group and/or COOH group, as a base resin, and the content of the rust-preventive additive component (B) is from 1 to 100 parts by weight (solid matter) to 100 parts by weight (solid matter) of the base resin.

21. The steel sheet of claim 20, wherein the organic coating further contains a solid lubricant (C), and the content of the solid lubricant (C) is from 1 to 80 parts by weight (solid matter) to 100 parts by weight (solid matter) of the base resin.

22. The steel sheet of claim 20, wherein the organic polymer resin (A) containing OH group and/or COOH group is a thermosetting resin.

23. The steel sheet of claim 20, wherein the organic polymer resin (A) containing OH group and/or COOH group is an epoxy resin and/or a modified epoxy resin.

38. An electric equipment product using the steel sheet with organic coating described in claim 1.

40. A building material using the steel sheet with organic coating described in claim 1.

42. A steel sheet for automobile using the steel sheet with organic coating described in claim 1.

24. A steel sheet with organic coating, comprising:

a zinc or a zinc alloy plated steel sheet or an aluminum or an aluminum alloy plated steel sheet;

a composite oxide coating formed on the surface of the plated steel sheet and containing Mg; and

an organic coating formed on the composite oxide coating and containing at least one rust-preventive additive component selected from the group consisting of (a) through (f),

(a) a Ca ion exchanged silica and a phosphate,

(b) a Ca ion exchanged silica, a phosphate, and a silicon oxide,

(c) a calcium compound and a silicon oxide,

(d) a calcium compound, a phosphate, and a silicon oxide,

(e) a molybdenate, and

(f) at least one compound selected from the group consisting of a triazole, a thiol, a thiadiazole, a thiazole, and a thiuram.

25. The steel sheet of claim 24, wherein said at least one rust-preventive additive component is:

(c) a calcium compound and a silicon oxide,

(e) a molybdenate, and

(f) at least one organic compound selected from the group consisting of a triazole, a thiol, a thiadiazole, a thiazole, and a thiuram.

26. The steel sheet of claim 24, wherein said at least one rust-preventive additive component is:

(a) a calcium compound and a silicon oxide, and

(f) at least one organic compound selected from the group consisting of a triazole, a thiol, a thiadiazole, a thiazole, and a thiuram.

27. The steel sheet of claim 24, wherein the composite oxide coating has a thickness of from 0.005 to 3 μ

m.

28. The steel sheet of claim 24, wherein the composite oxide coating contains:

(α

) oxide fine particles,

(β

) at least one substance selected from the group consisting of a phosphate and a phosphoric acid compound, and

(γ

) Mg.

29. The steel sheet of claim 24, wherein the organic coating has a thickness of from 0.1 to 5 μ

m.

30. The steel sheet of claim 24, wherein

the organic coating contains a reaction product (X) and the rust-preventive additive component (Y), said reaction product (X) being obtained from a reaction between a film-forming organic resin (A) and an activated-hydrogen-containing compound (B), at least a part of the compound (B) comprising a hydrazine derivative (C) containing activated hydrogen;

and

the content of the rust-preventive additive component (Y) is from 1 to 100 parts by weight (solid matter) to 100 parts by weight (solid matter) of the reaction product (X).

31. The steel sheet of claim 30, wherein the organic coating further contains a solid lubricant (Z), and the content of the solid lubricant (Z) is from 1 to 80 parts by weight (solid matter) to 100 parts by weight (solid matter) of the reaction product (X).

32. The steel sheet of claim 24, wherein the organic coating consists essentially of an organic polymer resin (A) containing OH group and/or COOH group, as a base resin, and the content of the rust-preventive additive component (B) is from 1 to 100 parts by weight ( solid matter) to 100 parts by weight solid matter of the base resin.

33. The steel sheet of claim 32, wherein the organic coating further contains a solid lubricant (C), and the content of the solid lubricant (C) is from 1 to 80 parts by weight (solid matter) to 100 parts by weight (solid matter) of the base resin.

39. An electric equipment product using the steel sheet with organic coating described in claim 24.

41. A building material using the steel sheet with organic coating described in claim 24.

43. A steel sheet for automobile using the steel sheet with organic coating described in claim 24.

34. A method for manufacturing steel sheet with organic coating comprising the steps of:

(a) preparing a zinc or a zinc alloy plated steel sheet, or an aluminum or an aluminum alloy plated steel sheet;

(b) preparing a treating liquid containing (i) oxide fine particles, (ii) phosphoric acid and/or a phosphoric acid compound, and (iii) at least one metal selected from the group consisting of Mg, Mn, and Al;

(c) adjusting the treating liquid so as the molar concentration of the additive component (i), the total molar concentration of the additive component (ii) converted to P₂O₅, and the total molar concentration of the additive component (iii) converted to the quantity of the at least one metal, to satisfy the molar ratio of (i)/(iii)=0.1 to 20, and of (iii)/(ii)=0.1 to 1.5;

(d) applying the treating liquid onto the plated steel sheet;

(e) forming a composite oxide film having a thickness of from 0.005 to 3 μ

m onto the surface of plated steel sheet by heating to dry the plated steel sheet on which the treating liquid was applied;

(f) applying a coating composition for forming an organic coating onto the composite oxide coating; and

(g) forming an organic coating having thicknesses of from 0.1 to 5 μ

m by heating to dry the plated steel sheet on which the coating composition was applied.

35. The method of claim 34, wherein the additive component (i) in the treating liquid for forming the composite oxide coating is a silicon oxide.

36. The method of claim 34, wherein the treating liquid for forming the composite oxide coating further contains an organic resin.

37. A treating liquid for forming a composite oxide coating consisting essentially of (i) oxide fine particles, (ii) phosphoric acid and/or a phosphoric acid compound, and (iii) at least one metal selected from the group consisting of Mg, Mn, and Al;

wherein the molar concentration of the additive component (i), the total molar concentration of the additive component (ii) converted to P₂O₅, and the total molar concentration of the additive component (iii) converted to the quantity of the at least one metal, satisfy the molar ratio of (i)/(iii)=0.1 to 20, and of (iii)/(ii)=0.1 to 1.5.