Velocidad de corrosión de una aleación base plomo en una solución de ácido sulfúrico a diferentes temperaturas

Abstract

Car batteries are not only affected by their use and wear but also by other factors such as electrolyte concentration, water loss and temperature that can be exposed, the latter being the most influential factor causing an increase in the corrosion rate of lead alloys (battery components), and affecting their service time. Therefore, for the industry of automobile batteries lead-acid type is very important to study the effect of temperature on the functioning of positive and negative grids during charging and discharging, which are carried out in batteries lifetime to be exposed to the sulfuric acid electrolyte. According to all of the above described, in this research work the influence of temperature in the corrosion rate of lead-antimony alloy was studied by electrochemical techniques: Electrochemical impedance spectroscopy (EIS), Tafel extrapolation, curve potentiodynamic and cyclic voltammetry. The tests were performed for exposure times of one and five days at temperatures of 25 and 65°C in sulfuric acid 0.5 M in flat cell with heat exchangers to control the temperature in the machine GAMRY 600. The potentials were measured regard to the calomel saturated reference electrode and a graphite bar was need as auxiliary electrode. Finally, the corrosion products formed were examined by a test of scanning electron microscopy (SEM).