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Paper Information

Journal:   IRANIAN JOURNAL OF MATERIALS SCIENCE AND ENGINEERING   Winter 2004 , Volume 1 , Number 1; Page(s) 35 To 42.
 
Paper: 

CYCLIC POTENTIODYNAMIC POLARIZATION STUDY OF TERNARY PB -SN-CA ALLOY IN 2M H_2SO_4 SOLUTION

 
 
Author(s):  ALAH KARAM S.R., ALAH KARAM S.R.
 
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Abstract: 
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.
 
Keyword(s): CYCLIC POTENTIODYNAMIC POLARIZATION, SULFURIC ACID, LEAD ALLOYS, ELECTROWINNING
 
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