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

1995 Fiscal Year Final Research Report Summary

• Project/Area Number: 06650805
• Research Category: Grant-in-Aid for General Scientific Research (C)
• Allocation Type: Single-year Grants
• Research Field: Material processing/treatments
• Research Institution: OKAYAMA UNIVERSITY
• Principal Investigator: HAYASHI Hidetaka OKAYAMA UNIVERSITY,FACULTY OF ENGINEERING,LECTURER, 工学部, 講師 (90164954)
• Project Period (FY): 1994 – 1995
• Keywords: composit plating / dispersion coating / codeposition

Research Abstract

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.