Abstract:
PROBLEM TO BE SOLVED: To restrain the diffusion of nickel into molten solder alloy when the soldering is performed, to improve the joined strength of the soldering by preventing the concentration increase of phosphorus and to restrain the reduction-precipitation of silver and/or copper into a part except an circuit pattern. SOLUTION: In a flux used when the soldering is performed in the circuit applied to a non-electrolytic nickel plating or further applying a gold-plating on the non-electrolytic nickel plating, one or more kinds of complexes of the silver ion and/or the copper ion are contained in this flux. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To smoothly prevent the mutual agglomeration of electroconductive media or articles to be plated, and to nicely carry out barrel plating when the barrel plating is carried out by using a neutral tinning bath. SOLUTION: The neutral tinning bath contains soluble stannous chloride, an acid or its salt, a complexing agent comprising an oxycarboxylic acid, a polycarboxylic acid, a monocarboxylic acid or at least one of their salts, and a specified quaternary amine polymer such as a poly(vinylpyridinium salt), a poly(vinylpiperidinium salt), a polycondensate of a quaternary amine-based dialkylamine-epichlorohydrin, a quaternary amine-based diallylamine polymer, a quaternized product of an N,N-dialkylaminoalkylstyrene polymer. By incorporating the specified quaternary amine polymer, the mutual agglomeration of electroconductive media is drastically reduced, plating failure of an article to be plated is avoided, and the plated articles and the electroconductive media can be smoothly separated by sieving after finish of plating. Accordingly, the productivity can be improved. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a liquid and a method for blackening a metal, capable of forming a practically useful blackened metal by a simple method of allowing the metal to contact with the liquid for blackening metal under such a mild condition as to be at a temperature near room temperature, without using an electrolysis process.SOLUTION: The aqueous solution for blackening the surface of the metal comprises the following components (A) and (B), and the method of blackening the surface of the metal includes causing the surface of the metal to contact with the aqueous solution. The component (A) is one or more selected from the group consisting of a fluoride ion, a borofluoride ion and a silicofluoride ion. The component (B) is one or more of polar aprotic solvents.