Study on the co-deposition mechanism aimed at minimizing powder concentration in electroplating bath

2016 Fiscal Year Final Research Report

• Project/Area Number: 25420768
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Muroran Institute of Technology
• Principal Investigator: SAEKI Isao 室蘭工業大学, 工学研究科, 教授 (50235090)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 電気めっき / 複合めっき

Outline of Final Research Achievements

Co-deposition of metals and particles is used to create a hard surfaces. Although some mechanism of co-deposition had been proposed so far, they are not satisfactory explain how the co-deposition proceed. This study aimed at establishing a co-deposition mechanism and minimizing the use of particle concentration in the plating baths. For Zn - alumina, chromia, rutile co-depostion system, the following conclusion was drawn.
(1) Adsorption of Zn ion on these particles increased with the solution pH. (2) Adsorption of the particles onto cathode surface was enhanced with decreasing the solution pH. (3) The maximum content of the particles in co-deposition was achieved at their PZC (point of zero charge) in the solution. (4) The minimum concentration of the particles in co-deposition baths was achieved with low pH. (5) Co-depostion was well explained by Guglielmi's equation. Acid-base property of the particles and adsorption of metal ion on the particles is important.

Free Research Field

材料工学