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Investigation of the mechanism of Ni-P alloy deposition using by in-situ surface pH measurement during electrodeposition  

이규환 (한국기계연구원 표면연구부)
장도연 (한국기계연구원 표면연구부)
김동수 (한국기계연구원 표면연구부)
이상열 (한국기계연구원 표면연구부)
권식철 (한국기계연구원 표면연구부)
강성군 (한양대학교 신소재공학부)
Publication Information
Journal of the Korean institute of surface engineering / v.35, no.2, 2002 , pp. 93-100 More about this Journal
Abstract
To better understand the codeposition mechanism of phosphorous, surface pH and potential of cathode were measured during electrodeposition of Ni-P alloys. The pH of cathode surface was measured using a flat-bottom glass pH electrode and a 500 mesh gold gauze as cathode. The cathode surface pH was increased with increasing the current density and always higher than the pH in the bulk solution. As a result of overplotting the surface pH and cathode potential on the Pourbaix diagram, it was found that cathode surface shift to the domain of predominant of $H_2$$PO3$-or $H_2$$PO_2$-. Additionally, new deposition mechanism was suggested that $H_2$ $PO_2$- and $H_2$$PO_3$- play important roles in the deposition reaction of Ni-P alloys.
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