Scully, Scott, Murphy & Presser, P.C.
Nickel plating solution and its preparation method, nickel plating method and printed wiring board copper foil
A nickel plating solution preparation method has the steps of: dissolving in water 100 g/L or more and less than 200 g/L of nickel sulfate, and 10 g/L or more and less than 30 g/L of sodium citrate or 8 g/L or more and less than 25 g/L of citric acid, but adding no nickel chloride; and adjusting a pH of the resultant solution to 2 or more and less than 4. Another nickel plating solution preparation method has the steps of: dissolving in water 100 g/L or more and less than 200 g/L of nickel sulfate, and 10 g/L or more and less than 30 g/L of sodium citrate or 8 g/L or more and less than 25 g/L of citric acid, but adding no boric acid; and adjusting a pH of the resultant solution to 2 or more and less than 4.
Hitachi Cable, Ltd.
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Shingo Koji Katsuyuki Hiroyuki Yasuyuki Kenji Yasuhiro Katsumi
Watanabe Nukaga Matsumoto Ogawara Ito Yokomizo Kusano Nomura