Volume 1, Number 1 (Oct 2004)                   IJMSE 2004, 1(1): 9-15 | Back to browse issues page


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ALAH KARAM S.R., ALAH KARAM S.R.. CYCLIC POTENTIODYNAMIC POLARIZATION STUDY OF TERNARY PB -SN-CA ALLOY IN 2M H_2SO_4 SOLUTION. IJMSE. 2004; 1 (1) :9-15
URL: http://ijmse.iust.ac.ir/article-1-90-en.html

Abstract:   (21064 Views)
In this paper redox reaction processes and phase, formation on ternary Pb-2Sn-0.08Ca alloy utilized as insoluble lead anodes in copper electro winning cells, were investigated in 2M H__2SO__4 electrolytes, using cyclic voltammetry technique (CVA). A potential range between - 1.3V to 2.6V was chosen at various scan rates in order to study the anodic behavior and phase composition of the oxide layers on Pb-2Sn-0.08Ca alloy. Potential measurements were carried out with respect to a standard calomel electrode (SCE). The surface examination and phase composition of the lead alloy were determined by electron microscopy analysis (SEM) and x-ray diffraction technique, after- exposure to the cyclic voltammetry tests. The results indicated that the protective oxide layer (Pb0__2) formed at a much slower rate when exposed to 2M H__2SO__4 solutions, whilst its degradation due to a reduction in the applied potential occurred at a much faster rate. Hence, Pb0__2 did not remain stable, when the externally applied potential dropped below 1.SV and as a result, pitting initiated sporadically on the surface of the electrode.
     
Type of Study: Research paper | Subject: Ceramics

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