Phosphate-treated steel plate
AssigneeNKK Corporation
InventorsKazuya Urata, Takahiro Kubota, Masaru Sagiyama, Satoru Ando, Tatsuya Miyoshi, Masaaki Yamashita
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Abstract
A phosphate-treated steel plate comprises a zinc-base plated steel plate; a zinc phosphate coating layer formed on the surface of the zinc-base plated steel plate; and an organic or inorganic coating formed on the zinc phosphate coating layer. The organic coating comprises at least one organic resin selected from the group consisting of an ethylene-base resin, an epoxy-base resin, a urethane-base resin, and an acrylic-base resin. The inorganic coating comprises a phosphate coating consisting mainly of a phosphate.
Claims58
A phosphate-treated steel plate comprising:
- a zinc-base plated steel plate;
- a zinc phosphate coating layer having a coating weight of from 0.2 to 2.5 g/m2, containing at least one metal selected from the group consisting of nickel, manganese and magnesium, formed on the surface of the zinc-base plated steel plate;
- and
- an organic coating comprising at least one organic resin selected from the group consisting of an ethylene-base resin, an epoxy-base resin, a urethane-base resin and an acrylic-base resin, formed on the zinc phosphate coating layer, the organic coating having a coating weight of 0.05 to 1.5 g/m2.
A phosphate-treated steel plate comprising:
- a zinc-base plated steel plate;
- a zinc phosphate coating layer having a coating weight of from 0.2 to 2.5 g/m2, containing at least one metal selected from the group consisting of nickel, manganese, and magnesium, formed on the surface of the zinc-base plated steel plate;
- and
- an organic coating consisting (i) of a block polyurethane-modified epoxy resin prepared by mixing a modified epoxy resin (A) comprising an epoxy resin, a multifunctional amine, and a monoisocyanate and a block urethane (B) comprising a polyol, a polyisocyanate and a block agent, at a mixing ratio of (A)/(B) of from 95/5 to 50/50 in terms of a weight ratio of nonvolatile matter and (ii) optionally at least one of a rust-preventive additive and a solid lubricant, formed on the zinc phosphate coating layer, the organic coating having a coating weight of 0.05 to 1.5 g/m2.
A phosphate-treated steel plate comprising:
- a zinc-base plated steel plate;
- a zinc phosphate coating layer having a coating weight of from 0.2 to 2.5 g/m2, containing at least one metal selected from the group consisting of nickel, manganese and magnesium, formed on the
- surface of the zinc-base plated steel plate;
- and an organic coating consisting of (i) an epoxy-base resin prepared by mixing 100 parts by weight as solid content of a substrate resin in which at least one basic nitrogen atom and at least two primary hydroxyl groups are added to a terminal of the molecular chain thereof, and 5 to 80 parts by weight as solid content of a polyisocyanate compound having at least two isocyanate groups in a single molecule thereof and (ii) optionally at least one of a rust-preventive additive and a solid lubricant formed on the zinc phosphate coating layer, the organic coating having a coating weight of 0.05 to 1.5 g/m2.
- 34.The phosphate-treated steel plate of claim 34, wherein the zinc phosphate coating contains 0.5 to 8.5 mass % of at least one selected from the group consisting of nickel, manganese, and magnesium.
The phosphate-treated steel plate of claim 34, wherein the organic coating contains a rust-preventive additive.
A phosphate-treated steel plate comprising:
- a zinc-base plated steel plate;
- a zinc phosphate coating consisting essentially of zinc phosphate, formed on the steel plate;
- and
- a phosphate coating consisting essentially of a phosphate of at least one metal selected from the group consisting of Mg, Al, Co, Mn, and Ca, formed on the zinc phosphate coating.
Dependencies are inferred from the claim text.