Inhibition Effects of Some Amino Acids on the Corrosion of Nickel in Hydrochloric Acid and Sulfuric Acid 


Vol. 59,  No. 2, pp. 125-131, Apr.  2015
10.5012/jkcs.2015.59.2.125


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  Abstract

공기를 제거한 상태에서 0.5M HCl과 0.5M H2SO4 용액에서 일어나는 니켈의 부식에 대하여 히스티딘 과 메티오닌의 부식억제 효과를 연구하였다. 각 경우에 니켈의 부식은 산화반응 속도가 감소되어 억제되었다. HCl 용액에서 니켈 표면에 일 어나는 아미노산의 흡착은 수정된 Langmuir 흡착 등온식을 따르지만, H2SO4 용액에서는 흡착된 분자들 간의 상호 작용에 영 향을 받아 Temkin의 대수함수 등온식이 잘 적용되었다. HCl 용액에서 흡착되는 히스티딘의 경우만 히스티딘의 {-NH3 +}, {-NH+=}와 니켈 표면의 {Ni-Cl-}사이의 정전기적 인력에 의해 물리흡착으로, 다른 경우는 Ni의 빈 d-orbital과 히스티딘 또는 메티오닌에 존재하는 비결합 전자쌍 사이에 화학흡착으로 설명할 수 있었다. Inhibition effects of histidine (His), methionine (Met) on the corrosion of nickel were investigated in deaerated 0.5 M HCl and 0.5 M H2SO4 solution. All the inhibition efficiency for the nickel corrosion depended on the anodic inhibition. Amino acid adsorption process on nickel surface in the solution of HCl can be explained by modified Langmuir isotherm, however, in the solution of H2SO4 by Temkin logarithmic isotherm due to the interaction between the adsorbed molecules. The molecule of histidine dissolved in HCl-solution were physically adsorbed due to the electrostatic interaction between the surface of {Ni-Cl-} and the {-NH3 +} and {-NH+=} of His. However the other cases of adsorption in this investigation can be explained by chemical adsorption between the empty d-orbital of Ni and the lone pair of electron in His and Met.

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  Cite this article

[IEEE Style]

Y. Kim, "Inhibition Effects of Some Amino Acids on the Corrosion of Nickel in Hydrochloric Acid and Sulfuric Acid," Journal of the Korean Chemical Society, vol. 59, no. 2, pp. 125-131, 2015. DOI: 10.5012/jkcs.2015.59.2.125.

[ACM Style]

Younkyoo Kim. 2015. Inhibition Effects of Some Amino Acids on the Corrosion of Nickel in Hydrochloric Acid and Sulfuric Acid. Journal of the Korean Chemical Society, 59, 2, (2015), 125-131. DOI: 10.5012/jkcs.2015.59.2.125.

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