Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


공학

한국표면공학회지 (37권6호 344-349)

Ni Electroplating in the Emulsions of Supercritical $CO_2$ Formed by Ultrasonar

초음파를 이용한 초임계 이산화탄소 에멀젼내 Ni 전해도금

고문성;주민수;박광헌;김홍두;김학원;한성호;;
Koh M. S.;Joo M. S.;Park K. H.;Kim H. D.;Kim H. W.;Han S. H.;Sato Nobuaki;

경희대학교;한국생산기술연구원;
;Tohoku University

Abstract

Emulsions were formed through putting small quantity of nickel electroplating solution into supercritical carbon dioxide, and then electroplating in the $sc-CO_2$ emulsions was conducted. It is an environmental-friendly technology that can solve the treatment of a large quantity of toxic plating wastewater, which is a big problem in the existing wet plating, and also can reduce secondary waste generation fundamentally. Supercritical carbon dioxide emulsions enhanced by ultrasonic horn were formed by non-ionic surfactant and nickel solution. Plating condition within emulsions was set up as 120bar and $55^{circ}C$ through measurement of electrical conductivity following the pressure change. Experiments were conducted respectively against supercritical carbon dioxide emulsions electroplating and general chemical electroplating, and then their results were compared and analyzed. As the experiment result utilizing emulsions, plating surface was formed very evenly even with a small quantity of electroplating solution, and fine particles were plated compactly without any pinhole or crack due to hydrogenation, which occurs in general electroplating. Used electroplating solution can be reused through recovery process. Therefore, this technology will be able to be applied as new clean technology in electro-plating.

Keywords

Supercritical;Carbon Dioxide;$CO_2$;Electroplating;Emulsions;Environment;Ultrasonic force;