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Highly corrosion-resistant surface-treated steel plate
| Details |
Inventors: Adaniya, Takeshi; Yamashita, Masaaki; Kubota, Takahiro; Enatsu, Akira; Nikaido, Norio; Miyosawa, Yoshiaki; Nishimoto, Tadashi;
Assignee: Nippon Kokan Kabushiki Kaisha (Tokyo, JP); Kansai Paint Co., Ltd. (Amagasaki, JP)
Primary Examiner: McDowell; Robert
Assistant Examiner:
Attorney, Agent or Firm: Nields; Henry C.
The present invention relates to a highly corrosion resistant surface-treated steel plate. The steel plate of the invention comprises a zinc deposition or zinc alloy deposition film as the undercoat deposition layer, a chromate film formed on the undercoat deposition layer and a film of a resin composition formed on the chromate film. This resin composition comprises a substrate resin formed by adding at least one basic nitogen atom and at least two primary hydrogen groups to terminal of an epoxy resin, silica and sparingly water soluble Cr compound. The resin composition may comprise a polyisocyanate compound as the curing agent. Moreover, the resin composition may comprise a silane compound as the crosslinking agent for the substrate resin and silica. |
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DETAILED DESCRIPTION The present invention relates to a highly corrosion-resistant surface-treated steel plate.
More particularly, the present invention relates to a surface-treated steel plate suitable for a car body or the like.
This surface-treated steel plate comprises a zinc deposition layer or a zinc alloy deposition layer (such as Zn-Ni alloy or Zn-Mn alloy deposition layer) as the undercoat deposition film, a chromate film formed on the surface of the undercoat deposition film and a film of a resin composition formed on the chromate film, which comprises a base resin formed by adding at least one basic nitrogen atom and at least two primary hyroxyl groups to terminals of an epoxy resin, silica and sparingly water soluble Cr compound.
Each of the components forming the resin composition films is mixed at the following weight ratios.
______________________________________
Base resin/silica = 99/1 to 30/70
Base resin/sparingly water soluble Cr compound
= 99/1 to 60/40
Base resin/(silica + sparingly water soluble Cr compound
= 75/25 to 50/50
Silica/sparingly water soluble Cr compound
= 37/3 to 20/20.
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The resin composition may be added with polyisocyanate as a hardening agent, and with silan compound as a crosslinking agent between the base resin and silica component.
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