الفهرس 
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Abstract
The corrodibility of the commercial Pb-1.7%Sb alloy in sulphuric acid solutions in the
absence and presence of phosphoric acid under open circuit and potentiostatic and galvanostatic
polarization conditions were studied by potential, cyclic voltammetry and electrochemical
impedance spectroscopy. Addition of H3PO4
increase the corrodibility of the alloy by retardation of
the growth of the passive PbSO
4
film that in turn slowdown the corrosion rate. The efficiency of
PbO2 formation and the self-discharge of PbO
2
decreases with increasing oxidation current. The
presence of H
3PO4 leads to a substantial decrease in both the efficiency of PbO
2
formation and
consequently its self-discharge. Life cycle tests show that H
3PO4
causes lesser surface penetration as
a result of inhibition of PbSO
4 via formation of PbHPO
4 and adsorption of phosphate on PbSO
4
.