| 摘要 |
Tin electro-plating solution contains sulfamic acid ion 30-300 g/l, divalent tin ion 15-300 g/l and aromatic nucleus OH group or the salt 5-100 g/l. Thus, the plating solution which contains divalent tin ion 70.2 g/l, sulfamic acid ion 2 10 g/l, polyethyleneglycol nonylphenylether 20 g/l and O-cresol sulfonic acid 40 g/l is coated on the copper plate at the temp. 30≦̸C with 25 A/dm2 current density for 50 seconds.
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