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Al-Cu-Li-Mg-Ag-Zr합금의 시효에 따른 전기화학적 분극 거동과 공식특성
민병철,정동석,손태원,조현기 ( B . C . Min,D . S . Chung,T . W . Shon,H . K . Cho ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.2
In this paper, we studied on both electrochemical polarization behaviors and pitting characteristics of ultra high strength Al-Cu-Li-Mg-Ag-Zr alloys(named C1 and C2) and 2090 alloy according to their treatments in the deaerated 3.5% NaCl, using by the potentiodynamic and the potentiostatic method; SEM micrograph and surface roughness including depth of pitting attack. With the cyclic polarization curves, the hysteresis of the C1 and C2 alloys appeared more remarkably than that of the 2090 alloy, because of precipitation microstructural difference between C1, C2 alloys and 2090 alloy. In the pitting experiments, the correlations between pitting growth and aging conditions were analyzed with the SEM micrograph and measurement of the pit depth.
오미혜(M . H . Oh),백지흠(C . H . Paik),조병원(B . W . Cho),윤경석(K . S . Yun),민병철(B . C . Min),주재백(J . B . Ju),손태원(T . W . Sohn) 한국수소및신에너지학회 1996 한국수소 및 신에너지학회논문집 Vol.7 No.1
Electrochemical oxidation of hydrogen on PdOx snf Pd exectrodes were investigated in aqueous 30% KOH solution at different temperatures and hydrogen concentrations(partial pressures). Anodic reaction by hydrogen on PdOx electrode was mainly due to the oxidation of adsorbed hydrogen at -0.8V?-0.5V(vs. Hg/HgO). For Pd electrode, the anodic reaction was participated by the adsorbed hydrogen on surface, as well as by the metal hydride formed from direct reaction between Pd and hydrogen at -0.5V-0.0V(vs. Hg/HgO). With the increase of hydrogen concentration the charge transfer resistance decreased and the exchange current increased. The transfer coefficient of PdOx and Pd electrodes were found to be 0.78 and 0.72 respectively, which shows the superior reactivity of Pd electrode. The activation energies of PdOx and Pd electrodes decreased with the increase of overpotential and were found to be 23.9-20.3 kJ/mole and 7.2-3.0kJ/mole, respectively.