摘要:
PROBLEM TO BE SOLVED: To provide a non-cyanogen system gold-palladium alloy plating solution that can make the appearance of a plating film excellent and can reliably suppress generation of defects such as a crack to the plating film.SOLUTION: The present invention relates to a non-cyanogen system gold-palladium alloy plating solution containing gold salt, palladium salt and appearance modifier, and is characterized in that the solution contains phosphate as appearance modifier and one or more of tellurium and/or selenium. It is preferred that the solution further contains hydantoin-type compound.
摘要:
PROBLEM TO BE SOLVED: To provide a pretreatment technique before plating in which when plating treatment is performed by making a plating object surface of a plating object face downward, influence of air bubbles or the like to a fine via or a fine trench formed on the plating object surface is suppressed as much as possible, and plating treatment can be surely performed.SOLUTION: There is provided a pretreatment method of plating treatment in which plating liquid is supplied to a plating object W in which a plating object surface is made to face downward, plating liquid is made to contact the plating object surface, and plating is performed. A plating object W is laid at an upper part 112 of a pretreatment tank, a plating object is heated, an inside of a pretreatment tank 110 is decompressed to be 9 hPa-40 hPa, water of 10°C-30°C is supplied to the inside of the pretreatment tank, gas in the pretreatment tank is replaced by a vaporization water, water is filled in the pretreatment tank to make water contact the plating object surface, then atmospheric air is introduced in the pretreatment tank to make the inside to be the atmospheric pressure, and water is made to attach to the plating object surface.
摘要:
PROBLEM TO BE SOLVED: To provide a gold displacement plating solution and a plating treatment technique, which can achieve uniform film thickness in the formation of a joint part that comprises a nickel layer, a palladium layer and a gold layer laminated in this order.SOLUTION: The gold displacement plating solution is used for forming, on a conductive layer comprising an electrically conductive metal, a joint part that comprises a nickel layer, a palladium layer and a gold layer laminated in this order. The gold displacement plating solution contains a gold cyanide salt, a complexing agent and a copper compound, the ratio of the complexing agent to the copper compound, i.e., the complexing agent/copper ions, in the gold displacement plating solution falls within the range from 1.0 to 500 by mole, and a compound formed from the complexing agent and the copper compound has a stability constant of 8.5 or more at pH of 4-6.