| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a copper-zinc alloy electroplating bath capable of forming a plating layer which has the target composition and is homogeneous and brilliant in a wide range of electric current density without using a cyan compound, and to provide a plating method using the copper-zinc alloy electroplating bath. <P>SOLUTION: The copper-zinc alloy electroplating bath contains copper salt, zinc salt, alkali-metal pyrophosphate or alkali-metal tartrate, and nitrate ion. A concentration of the nitrate ion preferably is 0.001 to 0.050 mol/L, the pH of the copper-zinc alloy electroplating bath preferably falls into the range of 8 to 14 and, further, the copper-zinc alloy electroplating bath preferably contains at least one kind selected from amino acid or its salt in addition to copper salt, zinc salt, alkali-metal pyrophosphate or alkali-metal tartrate, and nitrate ion, wherein histidine is suitably used as the amino acid. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
