Hydrodynamic and Oxygen Effects on Corrosion of Cobalt in Borate Buffer Solution 


Vol. 58,  No. 5, pp. 437-444, Oct.  2014
10.5012/jkcs.2014.58.5.437


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  Abstract

변전위법과 전기화학적 임피던스측정법(electrochemical impedence spectroscopy)을 이용하여 borate 완충용액에서 Co- RDE의 전기화학적 부식과 부동화에 대하여 조사하였다. Tafel 기울기, 코발트 회전원판전극의 회전속도, 임피던스 그리고 부 식전위와 부식전류의 pH 의존성으로부터 코발트의 부식과 부동화 반응 메커니즘과 환원반응에서의 수소 발생 반응구조를 제 안하였다. EIS data로부터 등가회로를 제안하였으며 산화반응의 영역별로 전기화학적 변수들을 측정하였다. 부식전위에서 측 정된 Nyquist plot의 induction loop가 낮은 주파수 영역에서 관측되는 것으로 보아 흡착/탈착 현상이 Co의 부식과정에 영향을 미치는 것으로 보인다. The electrochemical corrosion and passivation of Co-RDE in borate buffer solution was studied by Potentiodynamic and electrochemical impedance spectroscopy. The mechanisms of both the active dissolution and passivation of cobalt and the hydrogen evolution in reduction reaction were hypothetically established while utilizing the Tafel slope, the rotation speed of Co-RDE, impedance data and the pH dependence of corrosion potential. Based on the EIS data, an equivalent circuit was suggested. In addition, the electrochemical parameters for specific anodic dissolution regions were carefully measured. An induction loop in Nyquist plot measured at the open-circuit potential was observed in the low frequency, and this could be attributed to the adsorption-desorption behavior in the corrosion process.

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  Cite this article

[IEEE Style]

Y. Kim, "Hydrodynamic and Oxygen Effects on Corrosion of Cobalt in Borate Buffer Solution," Journal of the Korean Chemical Society, vol. 58, no. 5, pp. 437-444, 2014. DOI: 10.5012/jkcs.2014.58.5.437.

[ACM Style]

Younkyoo Kim. 2014. Hydrodynamic and Oxygen Effects on Corrosion of Cobalt in Borate Buffer Solution. Journal of the Korean Chemical Society, 58, 5, (2014), 437-444. DOI: 10.5012/jkcs.2014.58.5.437.

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ISSN(Print) 1017-2548
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