Patent ID: 9382635
Filing Date: 2016-07-05
CPC Classification: C23C,C25D

Claim Text:
1. A metal surface treatment agent that is used in a pretreatment of an electrodeposition coating of a metallic base comprising: one or more metallic elements (A) selected from the group consisting of zirconium, titanium, and hafnium; one or more coupling agents (B) selected from the group consisting of a silane coupling agent, a hydrolysate thereof and a polymer thereof; and an electrophilic reactive group-containing compound (C), wherein the electrophilic reactive group-containing compound (C) contains a homocycle and a heterocycle in one molecule, and has a water solubility of 0.2 to 30 g/L at 20° C., and when a content of the metallic element (A) by mass is represented by Wa, a content of the coupling agent (B) by mass is represented by Wb, and a content of the electrophilic reactive group-containing compound (C) by mass is represented by Wc, a relationship of the following formula (1) is satisfied: