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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 62, Number 5
JKCSEZ 62(5)
October 20, 2018

Title	Comparative Study of Corrosion Inhibition in Acidic and Neutral Chloride Media by Some Amino Acids 염산과 NaCl 수용액에서 알루미늄의 부식에 미치는 아미노산의 부식억제효과
Author	Jonghwa Yoon, Younkyoo Kim* 윤종화, 김연규*
Keywords	알루미늄, 부식억제, 아미노산, Langmuir, Temkin , Aluminum, Corrosion inhibition, Amino acids, Langmuir, Temkin
Abstract	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<Ala<His의 순서로 증가하였다. 각 용액에서 일어나는 아미노산들의 흡착은 Langmuir 흡착 등온 식에 따랐다. NaCl 용액에서는 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. Inhibition effects of alanine (Ala), histidine (His), methionine (Met) on the corrosion of aluminum were investigated in deaerated 0.5M 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<Ala<His. Amino acid adsorption process on aluminum surface in the solution of HCl can be explained by Langmuir isotherm. In NaCl solution, when the concentration amino acids are lower than 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.
Page	364 - 371
Full Text	PDF

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