STEEL PIPE FOR VEHlCLE PIPING
AssigneeSanoh Kogyo Kabushiki Kaisha
InventorsYoshihisa Tamura, Naoki Kawai
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Abstract
A steel pipe has a multi-layer coating including: a plating film formed on the surface of the steel pipe; a chemical conversion coating covering the plating film; a primer coating covering the chemical conversion coating and formed from a curable epoxy resin composition composed mainly of an epoxy compound and having an amide or imide bond introduced; and a polyamide resin coating covering the primer coating. The multi-layer coating can significantly enhance the adhesion force of the polyamide coating compared to the conventional pipe.
Claims12
A steel pipe for automotive piping, comprising a steel pipe coated with a multi-layer coating including a plating film, wherein the multi-layer coating comprises:
- a plating film formed on the surface of the steel pipe;
- a chemical conversion coating covering the plating film;
- a primer coating covering the chemical conversion coating and formed from a curable epoxy resin composition composed mainly of an epoxy compound and having an amide or imide bond introduced;
- and a polyamide resin coating covering the primer coating.
Dependencies are inferred from the claim text.