镍-磷-碳-氧化学镀层的制备、表征及1,4-丁炔二醇在体系中的作用

以铜片为基体,采用中心组合规则得到优化的化学镀镍-磷工艺配方.在优化的配方中加入一定量的1,4-丁炔二醇(BOZ),所得镀层表面形貌及组成结构用扫描电镜与X射线衍射仪进行表征,得到了光亮的Ni-P-C-O镀层,镀层硬度高,耐酸蚀性强;探讨了BOZ在反应体系中的作用机理.结果表明,BOZ不仅是光亮剂,而且参与该体系的氧化还原反应,BOZ分解反应的宏观动力学表现为准一级;当BOZ的初始含量为60～123 mg/dm3时,其参与氧化还原的量与温度和初始浓度呈正相关性,温度起主导作用;当BOZ的初始含量为123～240 mg/dm3时,其参与氧化还原的量与温度和初始浓度呈负相关性,浓度起主导作用.

Characterization of Bright Electroless Ni - P- C - O Coating and Reaction Mechanism of Butyne-1,4-diol as Brightener

Central combination rule was used to establish the optimized formulation for electroless Ni-P plating on a copper substrate. A bright electroless Ni-P coating was thus prepared by introducing brightener butyne-1,4-diol (coded as BOZ) of proper concentration in the optimized electroless Ni-P bath. The morphology and composition of the resulting bright electroless Ni-P coating were analyzed by means of scanning electron microscopy and X-ray diffraction, while the action mechanism of the brightener was explored as well. It was found that the brightener BOZ took part in the oxidation-reduction reaction during the electroless plating process, and the decomposition of BOZ was characterized by a quasi first-class reaction in terms of the reaction kinetics. Namely, when the initial concentration of BOZ was ranged within 60~123 mg/dm~ 3 , the consumption of BOZ, by way of taking part in the oxidation-reduction reaction, was positively proportional to temperature and the initial concentration, with temperature to be dominant. Contrary to the above, as the initial concentration of BOZ was ranged within 123~240 mg/dm~ 3 , the consumption of BOZ was negatively proportional to temperature and the initial concentration, with the BOZ initial concentration to be dominant. Moreover, the bright electroless Ni-P coating had a high hardness and good resistance to acid attack.