SnCl aqueous solution including HCl is used as a sensitizer of two-step catalyzation (sensitizationactivation) pretreatment for electroless metal plating onto non-conducting substrates. The sensitizer is inactivated by aging. In this study,the relationships among the Sn concentration of sensitizer,amount of adsorbates formed on the substrates, induction period of electroless Ni-P deposition and aging time have been investigated quantitatively. As the aging
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