Abstract
When the following pretreatments are applied in ABS resin, electroless copper having good adhesive property can be obtained as an undercoating for electroplating.
Chemical roughing CrO3 33g/l, conc. H2SO4 800cc/l, 60-70°C, 1min↓Water rinsing Neutralization 10% NaOH, room temp.↓Water rinsing Sensitizing SnCl2⋅2H2O 40g/l, conc. HCl 70cc/l, room temp. 1min↓Water rinsing Activating AgNO3 1.5g/l, conc. NH4OH 1.2cc/l, room Temp., 1min↓No rinsing↓Reducing 10% (vol.), formalin solution, room temp., a few sec.↓Drying 60-70°C↓No rinsing Electroless copper
When such pretreatments are applied, costly mechanical roughing process can be omitted and noble metals for activation are not needed, further more, the quality is far superior to the ones which are treated for activation with noble metals such as Pd or Au.
