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


Vol. 63,  No. 5, pp. 327-334, Oct.  2019
10.5012/jkcs.2019.63.5.327


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  Abstract

코발트의 부식에 대한 시스테인(Cys), 메티오닌(Met), 히스티딘(His)의 부식억제 효과를 공기를 제거한 0.5 M HCl과 0.5 M H2SO4 용액에서 연구하였다. 코발트에 대한 아미노산의 부식 억제효과는 혼합 부식억제 방식에 의하여 나타나지만, H2SO4 용액 에서는 산화반응 속도의 감소가 그리고 HCl 용액에서는 환원반응 속도의 감소가 더 큰 영향을 미쳤다. 코발트 표면에서 일어나는 아미노산의 흡착은 수정된 Langmuir 흡착 등온식을 따르며 HCl, H2SO4 용액에서 흡착되는 히스티딘은 히스티딘의 {-NH3 +}, {-NH+=} 와 코발트 표면의 {Co-Cl-δ}와의 정전기적 인력에 의한 물리흡착으로, 다른 경우는 Co의 빈 d-orbital과 시스테인 또는 메티오닌 에 존재하는 S의 비공유 전자쌍 사이에서 일어나는 화학흡착으로 설명할 수 있었다. Inhibition effects of cysteine(Cys), methionine(Met), and histidine(His) on the corrosion of cobalt were investigated in deaerated 0.5 M HCl and 0.5 M H2SO4 solution. All the inhibition efficiency (IE) in the amino acids for the cobalt corrosion depended on the mixed inhibition. However, IE in the solution of H2SO4 depended more on the anodic and in the solution of HCl on the cathodic inhibition. Amino acid adsorption process on cobalt surface in the solution can be explained by modified Langmuir isotherm. The molecules of histidine dissolved in both of the solution were physically adsorbed due to the electrostatic interaction between the surface of {Co-Cl-δ} and the {-NH3 +} or {-NH+=} of His. However the other cases of adsorption in this investigation can be explained by chemical adsorption between the empty d-orbital of Co and the lone pair of electron in S-atom in Cys and Met.

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  Cite this article

[IEEE Style]

H. Park and Y. Kim, "Inhibition Effects of Some Amino Acids on the Corrosion of Cobalt in Hydrochloric Acid and Sulfuric Acid," Journal of the Korean Chemical Society, vol. 63, no. 5, pp. 327-334, 2019. DOI: 10.5012/jkcs.2019.63.5.327.

[ACM Style]

Hyunsung Park and Younkyoo Kim. 2019. Inhibition Effects of Some Amino Acids on the Corrosion of Cobalt in Hydrochloric Acid and Sulfuric Acid. Journal of the Korean Chemical Society, 63, 5, (2019), 327-334. DOI: 10.5012/jkcs.2019.63.5.327.

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ISSN(Print) 1017-2548
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