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Choi, Chil-Nam,Yang, Hyo-Kyung,Kim, Sun-Kyu 조선대학교 기초과학연구소 1999 自然科學硏究 Vol.22 No.1
In this study, we were carried out the experiments for measuring the variations of corrosion potential and current density for polarization curves with polyvinylchloride. The results were examined to find out especially the influence affecting the corrosion potential and vary condition (temperature, pH, enzyme, and added salt). The lines representing active anodic dissolution were shift only slightly in the noble potential direction by temperature, pH, enzyme and salt. Tafel slope for anodic dissolution could be determined because of polarization effect to vary condition. Line slope of the polarization curves describing the active-to-passive transition region was shifted noticeably in the noble direction. Also, from the variation of conditions, we are speculated a best of conditions which it most readily transforms (temperature, pH, corrosion rate, and resistance of corrosion potential). The second anodic current density peak and maximum passive current density are designated degradation(I_p/I_0). The value of I_p/I_0 is used in measuring for the extent of degradation of the polyvinychloride. The petentiodynamics parameter of the corrosion was obtained using Tafel plot.
최칠남,양효경,Choi, Chil Nam,Yang, Hyo Kyung 대한화학회 2001 대한화학회지 Vol.45 No.2
이 연구에서 온도, pH, 효소, 그리고 염의 첨가에 따라 부식(산화)전위에 영향을 주 인자들을 알아보기위해 비수용액 poly(vinylchloride)(PVC)와 poly(carbonate)(PC) 의 산화전위와 전류밀도를 측정하였다. Tafel 기울기는 분극곡선의 Tafel polt으로부터 결정되어졌다. 전달게수 ${\alpha}$는 기울기 (1-${\alpha}$)nF/2.3RT에서 얻어질 수 있고 인식된 전극 반응은 모든 조건에서 비가역적으로 나타났다. In this study we measured oxidation potentials and current densities for poly(vinylcholride) (PVC) and poly(carbonate)(PC) in nonaqueous solutions, in order to find out how corrosion (oxidation) potentials depend on temperature, pH, enzyme, or added salts. The Tafel's slopes were determined from the Tafel plots of polarization curves. The transfer coefficients (${\alpha}$) wre evaluated from the slope(1-${\alpha}$)nF/2.3 RT, and the electrode reactions appeared irreversible under all conditions.
Electrochemical Behavior of Polymers in Aprotic Medium
Choi, Chil-Nam,Yang, Hyo-Kyung,Kim, Il-Do,Baek, Seung-Nam,Son, Hyo-Youl 조선대학교 기초과학연구소 2001 自然科學硏究 Vol.24 No.-
In this study, we carried out the electrochemical experiments for measuring the variations of oxidation potential and current density for polarization curves of poly(vinylchloride) and poly(carbonate). The results were examined to find out especially the factors affecting the corrosion potential under various conditions such as temperature, pH, enzyme, and salts added. The lines representing an active anodic dissolution were shifted only slightly in the 'noble' potential direction depending on temperature, pH, enzyme, and salt. The Tafel slope for anodic dissolution could be determined because of polarization effect depending on conditions. On the other hand, the line slopes of the polarization curves were shifted noticeably in the noble direction. The susceptibility were obtained to the current density ratio (I_(t)/I_(f)) with a maximum current density (forward and reverse scan). The value of I_(t)/I_(f) was used in measuring the extent of corrosion sensitivity of the poly(vinylchloride) and poly(carbonate). The potentiodynamics parameters of the corrosion were obtained using a Tafel plot. The transfer coefficient α can be evaluated from the anodic slope(1-α)nF/2.3RT and the electrode reaction is a irreversible under all conditions.
Oxidation of Polycarbonate and Polypropylene in Organic Solvent
Choi, Chil-Nam,Kim, Il-Do,Yang, Hyo-Kyung,Kim, Moyung-sun,Baek, Seurg-Nam,son, Hyo-Youl 조선대학교 기초과학연구소 2001 自然科學硏究 Vol.24 No.-
We carried out to measure the variations in the corrosion potential and current density on polarization curves of the polycarbonate and polypropylene. The results were particularly examined to identify the influences on corrosion and corrosion rate of various factors including temperature, pH, salt, and oxygen. The Tafel slope for the anodic dissolution was determined by the polarization effect depending on these conditions. the optimum conditions were established for each case. The second anodic current density peak and maximum passive current density were designated as the relative corrosion sensitivity (I_(t)/I_(f)). The mass transfer coefficient value(α) waw determined with the Tafel slope for anodic dissolution based on the polarization effect with optimum conditions.
Kim, Sun-Kyu,Han, Mi-Kyung,Yang, Hyo-Kyung,Choi, Chil-Nam,Kim, Il-Doo 조선대학교 기초과학연구소 1999 自然科學硏究 Vol.22 No.1
The Chemical behavior of Mo(VI) and W(VI) complexes with the ligand has been investigated by UV/vis-spectrophotometric, magnetic, and electrochemical methods. Three energy absorption bands are observed in the spectra of these complexes. The crystal field splitting energy, spin pairing energy, and bond strength were obtained from the spectra of complexes. The electronic properties of the complexes are found to be delocalized, and low-spin state. The correlation between ligand and metals were strong bonding strength and diamagnetics. The redox processes of these complexes are a one-electron one step reaction. Mo and W complexes exhabits reversible of 1st step and irreversible from 2nd to 5th steps redox waves.
최칠남(Choi, Chil-Nam),양효경(Yang, Hyo-Kyung) 대한화학회 2002 대한화학회지 Vol.46 No.1
우리는 고분자 물질들에 대해서 전위와 전류 밀도의 변화를 측정하였다. 온도와 pH를 포함하여 전위와 속도에 대한 영향을 주는 여러 요인들에 밝히기 위하여, 연구 결과들이 주위 깊게 조사되었다. 양극 해리에 대한 Tafel 기울기는 이들 조건 하에서 분극 효과로 결정되었다. 각 경우에 최적 조건들이 확립되었다. 두 번째 양극 전류 밀도 피크와 최대 전류 밀도는 상대적 분극 감도로 지정되었다. 최적 조건에서의 분극 효과를 바탕으로, 질량 전달 계수는 양극 해리에 대한 Tafel 기울기에 의해서 결정되었다. We measured the variations of potentials and current densities for several polymers. The results were carefully examined to identify various factors such as temperature and pH to influence the potential and rate. The Tafel slope for anodic dissolution was determined by the polarization effect under these conditions. The optimum conditions were established for each case. The second anodic current density peak and maximum current density were designated as the relative polarization sensitivity . The mass-transfer coefficient value was determined by the Tafel slope for anodic dissolution on the basis of the polarization effect under optimum conditions.