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The effect of the addition of phosphoric acid ((HO) 3P=O), potassium hydrogen phosphate ((HO) 2P(O)(O - K + )), dimethyl vinylphosphonate (CH 2=CH ―P(O)(OCH 3)2) and vinylphosphonic acid (CH 2=CHP(O)(OH) 2) on lead corrosion in 4 M H 2SO 4 was studied by potentiodynamic polarization and electro chemical impedance spectroscopy (EIS). The results show that phosphoric acid and po tassium hydrogen phosphate, added to an optimal concentration of 0.4 M, reduce the le ad passivation current and increase its corrosion current, with charge transfer as the main reaction mechanism at the interface metal/electrolyte. They also increase PbO 2 formation’s potential when they are added at larger concentrations, while adding dimeth yl vinylphosphonate and vinylphosphonic acid up to 0.3 M reduces corrosion current and lead passivation current. This last product appears to suppress the formation of PbO 2. The parameters of potentiodynamic polarization are in good agreement with those of EIS.

Improving the Corrosion Resistance of Lead in H2SO4 4 M by the Addition of Phosphoric and Phosphonic Compounds for Lead Grid Batteries