Metal surface treatment agent, metal surface treatment method, and metal material
AssigneeNihon Parkerizing Co., Ltd.
InventorsAmane Suzuki, Tomohiro Iko
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Abstract
The present invention addresses a problem of providing, for example, a metal surface treatment agent capable of forming a coating film that exhibits good corrosion resistance at edges, such as cut portions, of a coated metal material. The problem is solved by a metal surface treatment agent comprising: an ion (A) containing at least one kind of metal selected from zirconium, titanium and hafnium at a metal-equivalent molar concentration of 0.1 mmol/L or higher; and an aqueous urethane resin (B) having a weight-average molecular weight of 50,000 or higher at a solid mass concentration of 0.5 to 10 g/L, in which the ratio of a solid mass (BM) of the resin (B) to a metal-equivalent mass (AM) of the ion (A), [BM/AM], is 0.7 or higher.
Claims5
A metal surface treatment agent, comprising:
- an ion (A) comprising at least one kind of metal selected from zirconium, titanium, and hafnium at a metal-equivalent molar concentration of 0.1 mmol/L or higher;
- and
- an aqueous urethane resin (B) having a weight-average molecular weight of 100,000 or higher at a solid mass concentration of 0.5 g/L to 10 g/L,
- wherein a ratio of a solid mass (BM) of the resin (B) to a metal-equivalent mass (AM) of the ion (A), [BM/AM] is 0.7 or higher.
Dependencies are inferred from the claim text.