| 摘要 |
A neutral tin electroplating bath for obtaining a compact tin coating, comprising a stannous salt, an alkali metal salt of pyrophosphoric acid, a polyhydric phenol, a surface-active agent and, if desired, at least one additive selected from the group consisting of hydrazine, hypophosphorous acid, phosphous acid, ascorbic acid, formaldehyde and salts thereof.
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