| abstract |
(57) [Summary] (Modified) [Purpose] Chemical conversion coating with excellent moisture resistance, heat resistance, and chemical resistance on the surface of solder, electroless solder, metal such as nickel, silver, zinc, copper, and copper alloy. Form not only to prevent rust on the metal surface, but also to allow long-term storage without deteriorating the wettability and spreadability of the solder. [Structure] [1] A metal surface such as solder, electroless solder, nickel, silver, zinc, copper, copper alloy, etc., in an aqueous solution containing a compound represented by the formula and the like, an organic acid, an inorganic acid, a metal compound, etc. To contact. (In the formula, R 1 = hydrogen, alkyl group, phenylalkyl group, allyl group, R 2 = alkyl group, phenylalkyl group, R 3 = hydrogen, sulfonic acid group, alkyl group, phenyl group, halogen atom, n = 0-17, x = 0 to 1.) |