Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Comparative Study of Corrosion Inhibition in Acidic and Neutral Chloride Media by Some Amino Acids

염산과 NaCl 수용액에서 알루미늄의 부식에 미치는 아미노산의 부식억제효과

  • Yoon, Jonghwa (Department of Chemistry, College of Natural Science, Hankuk University of Foreign Studies) ;
  • Kim, Younkyoo (Department of Chemistry, College of Natural Science, Hankuk University of Foreign Studies)
  • 윤종화 (한국외국어대학교 자연과학대학 화학과) ;
  • 김연규 (한국외국어대학교 자연과학대학 화학과)
  • Received : 2018.05.15
  • Accepted : 2018.07.26
  • Published : 2018.10.20
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Abstract

Inhibition effects of alanine (Ala), histidine (His), methionine (Met) on the corrosion of aluminum were investigated in deaerated 0.5 M HCl and NaCl solution. In HCl solution the inhibition efficiency for the aluminum corrosion depended on the cathodic inhibition, and the inhibition efficiency was increased in the order of Met$10^{-4\;}M$ the adsorption process can be explained by Langmuir isotherm, however, in the case of higher concentration by Temkin logarithmic isotherm due to the interaction between the adsorbed molecules.

공기가 제거된 0.5 M HCl 과 0.5 M NaCl 용액에서 일어나는 알루미늄의 부식에 대하여 알라닌(Ala), 히스티딘(His) 과 메티오닌(Met)의 부식억제 효과를 조사하였다. HCl에 용해된 Ala, His, Met의 경우 모두 환원반응 속도가 감소되어 부식이 억제 되었으며, 부식억제 효율은 Met$10^{-4\;}M$ 보다 묽은 용액에서 Langmuir 흡착 등온식이 적용되었으나 $10^{-4\;}M$ 보다 진한 용액에서는 흡착된 분자 사이의 상호작용에 의하여 Temkin의 대수함수 등온식이 적용되었다.

Keywords

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