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Analysis on Variation of Primary Elements of Stainless Steel Interacting with Alkali Solution

알칼리 전해액의 상호작용에 의한 Stainless Steel 주성분의 변화 분석

  • Byun, Chang-Sub (National Center for Nanomaterials Technology, Pohang University of Science and Technology) ;
  • Lim, Soo-Gon (EM KOREA Co., Ltd.) ;
  • Kim, Su-Kon (National Center for Nanomaterials Technology, Pohang University of Science and Technology) ;
  • Choi, Ho-Sang (Department of Chemical Engineering, Kyungil University) ;
  • Shin, Hoon-Kyu (National Center for Nanomaterials Technology, Pohang University of Science and Technology)
  • 변창섭 (포항공과대학교 나노기술집적센터) ;
  • 임수곤 (이엠코리아주식회사) ;
  • 김수곤 (포항공과대학교 나노기술집적센터) ;
  • 최호상 (경일대학교 화학공학과) ;
  • 신훈규 (포항공과대학교 나노기술집적센터)
  • Received : 2013.06.13
  • Accepted : 2013.06.24
  • Published : 2013.07.01

Abstract

In this paper, We studied the change of surface and variation of elements on both electrodes of hydrogen generator of alkaline electrolysis in use of FE-SEM and SIMS. We used the stainless steel 316(600 ${\mu}m$) as electrode in condition of 25%KOH, $60^{\circ}C$ Temperature. The results show that the intensity of elements (C, Si, P, S, Ti, Cr, Mn, Fe, Ni, Mo) of Positive Electrode are decreased as much as about $10^1{\sim}10^3 $than the original electrode. Thickness of Positive Electrode is decreased about 40 ${\mu}m$ after chemical reaction. The negative electrode, however, shows a slight variation in the intensity of elements (C, Si, P, Fe, Ni, Mn, Mo) but Change of thickness and surface' shape of electrode show nothing after chemical reaction. The change in thickness and variation of Stainless Steel 316 cause the lifetime of electrode to be shorted. We also observed hydrogen, oxygen, potassium in both electrodes. Especially, The potassium is increased in proportional with depth of positive electrode. this means the concentration of alkali solutions is changed. and so we have to supply alkaline solution to generator in order to produce same quantity of hydrogen gas continuously. we hope that this study gives a foundation to develop the electrode for hydrogen generator of alkaline electrolysis.

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