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以次磷酸盐酸性化学沉积镍体系为对象,研究了基体对化学沉积反应具有催化活性的电化学本质。首先利用稳定电位的测量明确化学沉积镍反应中次磷酸盐氧化的决定性作用,并发现次磷酸盐的氧化反应也具有特征反应电位。基于先前研究得到的次磷酸盐阳极氧化机制,提出对化学沉积镍反应具有催化活性的金属需符合的条件是,在化学镀液中金属的电位高于次磷酸盐的氧化还原电位的同时,必须低于该金属在此特定镀液中的零电荷电位值。并选取5种具有代表性的金属进行了实验验证。
The hypophosphorous acid electroless nickel deposition system was used to study the electrochemical properties of the substrate for the catalytic activity of chemical deposition. First, the determination of stable potential was used to confirm the decisive role of hypophosphite oxidation in the electroless nickel deposition. It was also found that the hypophosphite oxidation reaction also has a characteristic reaction potential. Based on the hypophosphite anodic oxidation mechanism obtained in the previous study, it is proposed that the metal having a catalytic activity for the electroless nickel reaction be satisfied that, in the electroless plating bath, the potential of the metal is higher than the redox potential of the hypophosphite, and it is necessary Below the zero-charge potential value of the metal in this particular bath. Five kinds of representative metals were selected and tested.