Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Characteristics of Electroless Sn Plating Electrolyte using a Choline Chloride-Based Ionic Liquid

  • Park, Chieon (Smart Textiles R&D Group, Research Institute of Industrial Technology Convergence, Korea Institute of Industrial Technology) ;
  • Yoo, Bongyoung (Department of Materials Science and Chemical Engineering, Hanyang University) ;
  • Lee, Joonkyun (Smart Textiles R&D Group, Research Institute of Industrial Technology Convergence, Korea Institute of Industrial Technology)
  • Received : 2018.05.04
  • Accepted : 2018.07.02
  • Published : 2018.09.05
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Abstract

In the present study, a choline chloride(ChCl)-based ionic liquid(IL) was used as an electrolyte to confirm the characteristics of electroless tin plating. The effect of the type of additive and reducing agent, as well as the addition of complexing agent and water, on the properties of the ChCl-based IL, including the freezing point, viscosity, conductivity, open circuit potential, and plating thickness, was investigated. The results showed that the crystallization temperature was $25^{\circ}C$ when the ChCl-thiourea molar ratio was 1:1, and it decreased to $10^{\circ}C$ upon adding the additive, while the conductivity increased and viscosity decreased. Dimethylthiourea was added to promote the electroless plating reaction. Electrolytic tin plating was performed at $70^{\circ}C$ using ChCl -thiourea-based IL as the electrolyte. The thickness of the tin-plated layer was $1.5{\mu}m$ when malonic acid and dimethylthiourea were used. The addition of a small amount of water increased the plating speed and thickness, and the maximum thickness of $2{\mu}m$ for the tin-plated layer was obtained after 30 min. These characteristics demonstrate the potential applications of these environmentally friendly electrolytes for fast, thick, and dense electroless tin plating using ILs at low temperatures.

Keywords

Acknowledgement

Supported by : Ministry of SMEs and Startups

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