Zinc alloy-plated corrosion preventive steel sheet having an organic coating layer thereon and a method for making the same
AssigneeKabushiki Kaisha Kobe Seiko Sho
InventorsShingo Nomura, Hirohiko Sakai, Kanji Nakamura, Etuo Yamamoto
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Abstract
A corrosion preventive steel sheet having an organic coating layer is described. The steel sheet is comprised of a zinc alloy-plated steel sheet, and a chromate layer and an organic coating layer formed in this order on at least one side of the steel sheet. The organic coating layer is formed from a coating composition comprised of 100 parts by weight of a water-soluble urethane resin and from 5 to 80 parts by weight of colloidal silica. A method for making the corrosion preventive steel sheet is also described.
Claims19
A corrosion preventive steel sheet which comprises a zinc alloy-plated steel sheet, and a chromate layer and an organic coating layer formed on at least one side of the steel sheet in this order, said organic coating layer being formed from a coating composition comprised of 100 parts by weight of a water-soluble urethane resin and from 5 to 80 parts by weight of colloidal silica.
A method for making a corrosion preventive steel sheet which comprises:
- providing a zinc alloy-plated steel sheet having a chromate layer on at least one side thereof;
- applying onto the at least one side of steel sheet a coating composition comprised of 100 parts by weight of a water-soluble urethane resin, from 5 to 80 parts by weight of colloidal silica and 1 to 40 parts by weight of a silane coupling agent;
- and baking the applied composition to form a resin layer on the at least one side.
Dependencies are inferred from the claim text.