STUDIES ON COMPOSIT PLATING AS A FABRICATING PROCESS FOR FUNCTIONAL THIN FILM

复合涂层具有耐磨性、自润滑性、耐腐蚀性和抗氧化性等功能。虽然复合涂层在许多工业过程中得到了应用，但分散相共沉积的机理尚未完全阐明。在本研究项目中，取得了以下结果：首先，阐明了氧化物颗粒(如二氧化钛颗粒)共沉积与吸附金属离子的种类和数量的关系。本研究主要采用含二氧化钛颗粒的酸性硫酸铜镀液。二氧化钛颗粒表面的羟基与镀液中的Cu2+反应，生成H+，并吸附在二氧化钛颗粒上。该反应既依赖于Cu2+的浓度，又依赖于溶液的pH值。结果表明，共沉积二氧化钛的量随着镀液pH值的增加而增加，说明共沉积粒子的量与粒子上吸附的Cu2+和Gt+的量有关。讨论了共沉积行为与金属离子沉积性质的关系。

Composite coating gives various functional properties, such as wear resistance, self-lubricating, corrosion or oxidation resistance etc.to the plated surface. Although the composite coatings are used in many industrial processes, the mechanism of codeposition of dispersoid is not fully elucidated.In this research project, the following results were obtained ; At first, the dependence of the codeposition of oxide particles, such as titanium dioxide particles, on the kind and the amount of adsorbed mental ion was elucidated. An acid copper sulfate bath with titanium dioxide particles was mainly used for this investigation. The surface OH group of the titanium dioxide particle reacts with Cu^<2+> in the bath, which results in H^+ production and the adsorption of Cu^<2+> on the particle. This reaction depends both on the concentration of Cu^<2+> and on the pH of the solution. It was found that the amount of codeposited titanium dioxide increased with increasing pH of the bath, which indicates that the amount of codepositing particles depends upon the amount of Cu^<2+> adsorbed on the particle. Relation between the codeposition behavior and the nature of depositing metal ion is also discussed.