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Highly corrosion-resistant, multi-layer coated steel sheets
| Details |
Inventors: Adaniya, Takeshi; Yamashita, Masaaki; Kubota, Takahiro; Nikaido, Norio; Miyosawa, Yoshiaki; Nishimoto, Tadashi; Ozawa, Kazuhiko;
Assignee: Nippon Kokan Kabushiki Kaisha (Tokyo, JP); Kansai Paint Co., Ltd. (Amagasaki, JP)
Primary Examiner: Morris; Theodore
Assistant Examiner: Wyszomierski; George
Attorney, Agent or Firm: Nields; Henry C.
This invention relates to a highly corrosion-resistant, multi-layer coated steel sheet, and includes an undercoat film obtained by galvanization or zinc-alloy plating and a chromate coated film thereon, on which a resin-composition film is further applied, comprising an organic high-molecular weight resin having a glass transision temperature of 343.degree. to 423.degree. K. and soluble in organic solvent and hydrophobic silica. For the purpose of improvement of corrosion preventiveness, a sparingly water soluble Cr compound may be contained in this resin composition film. Together with this sparingly water soluble Cr compound, a di- or tri-alkoxysilane compound may be also contained in the resin composition film. |
|
DETAILED DESCRIPTION What is claimed is: 1.
A highly corrosion-resistant, multi-layer coated steel sheet plated with zinc or a zinc alloy, which includes the following films A and B on its plated side in that order: A: a chromate film, and B: a resin-composition film composed of an organic highmolecular weight resin having a glass transition temperature of 343.
degree.
to 423.
degree.
K.
and soluble in an organic solvent and hydrophobic silica in a proportion of 80:20 to 62:38 in weight (organic high-molecular weight resin: hydrophobic silica) ratio, and said films being deposited in a coating amount of 0.
3 to 3.
0 g/m.
sup.
2.
2.
A steel sheet as recited in claim 1, wherein said organic highmolecular weight resin is one of acrylic copolymer, alkyd and epoxy resins, or a mixture or addition condensation product of two or more thereof.
3.
A highly corrosion-resistant, multi-layer coated steel sheet plated with zinc or a zinc alloy, which includes the following films A and B on its plated side in that order: A: a chromate film, and B: a resin-composition film composed of an organic high-molecular weight resin having a glass transition temperature of 343.
degree.
to 423.
degree.
K.
and soluble in an organic solvent, hydrophobic silica in a proportion of 80:20 to 62:38 in weight (organic high-molecular weight resin:hydrophobic silica) ratio and sparingly water soluble Cr compound in a proportion of 1 to 30 weight parts per 100 weight parts of said organic high-molecular weight resin, and said films being deposited in a coating amount of 0.
3 to 3.
0 g/m.
sup.
2.
4.
A steel sheet as recited in claim 3, wherein the proportion in weight ratio of said organic high-molecular weight resin:said (hydrophobic silica+sparingly water soluble Cr compound) is between 80:20 and 56:44, and the proportion in weight ratio of said hydrophobic silica:said sparingly water soluble Cr compound is between 37:3 and 25:15.
5.
A steel sheet as recited in claim 4, wherein the proportion in weight ratio of said organic high-molecular weight resin:said (hydrophobic silica+sparingly water soluble Cr compound) is between 70:30 and 56:44
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