CLO3 AND BRO3 ANIONS INFLUENCE UPON THE LEAD POLARIZATION BEHAVIOR INCONCENTRATED H2SO4 SOLUTIONS ON REDUCED POTENTIAL RANGES

The influence of the little ammounts of KCl3 and NaBrO3 on the behavio ur of lead electrode, at the polarization in concentrated H2SO4 soluti ons have been studied for limited region of potential, using the poten tiodynamic technique. The reference electrode was Hg/Hg2SO4/H2SO4. Ana lysing the potentiodynamic curves and the results of the coulometric m easurements, we discovered that the main effect of the additives is an accentuated passivation of the electrode processes, on the studied re gion of potential. Taking in to consideration the ratio of the additiv es ammounts and of the active mass/unit of the lead - acid batteries s urface, the conclusion is that the additives don't decrease the capaci ty of the active mass, but they can hinder the formation of the insula ting films between the active mass and the grill.