Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Corrosion Inhibition of Steel by Addition of Birch Sap in Chloride Solution

염화물 수용액에서 자작나무 수액을 이용한 철강의 부식 억제

  • Park, Tae-Jun (Department of Advanced Materials Engineering, Chosun University) ;
  • Kim, Ki Ae (Department of Environmental Science and Engineering, Ewha Womans Universigy) ;
  • Lee, Ji Yi (Department of Environmental Science and Engineering, Ewha Womans Universigy) ;
  • Jang, HeeJin (Department of Materials Science and Engineering, Chosun University)
  • 박태준 (조선대학교 첨단소재공학과) ;
  • 김기애 (이화여자대학교 환경공학과) ;
  • 이지이 (이화여자대학교 환경공학과) ;
  • 장희진 (조선대학교 재료공학과)
  • Received : 2018.08.27
  • Accepted : 2018.10.05
  • Published : 2018.10.31
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Abstract

The effects of birch sap, a possible natural corrosion inhibitor, on the corrosion behavior of steel in chloride solution were investigated. The corrosion rate was significantly reduced by the addition of 1~5 mL of birch sap to 500 mL of 3wt% NaCl or 3wt% $CaCl_2$ solution. A remarkable increase in the pitting potential in NaCl solution was observed by the addition of birch sap although it was almost constant in $CaCl_2$ solution. The corrosion rate of steel in both NaCl and $CaCl_2$ birch sap solution without addition of water was higher compared to that of aqueous solution without birch sap as the pH of the birch sap was 4.0. The presence of organic compounds like, fructose, galactose, glucose, and palmitic acid in the birch sap are thought to be adsorbed effectively on the metal surface, which provided corrosion protection. However, the inorganic elements including Na, Ca, K, Mg, Mn, S, etc. present in the birch sap exhibited no role in corrosion inhibition.

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