Abstract
The objective of this work was evaluate the electrochemical behavior of the passivation layer exposed in a sodium chloride medium (NaCl) and sulfuric acid (H2SO4). For these tests was used electrochemical technique of potentiodynamic polarization curves evaluating steel 15-5PH passivated in citric acid at temperatures of 25 and 49°C of passivation with immersion times in the passivate agent of 30 and 90 minutes. The results obtained show stable passive layers at potential intervals of -200mV to 150mV 360 mV with passivation temperature of 49°C and time of 30 minutes in a NaCl solution. In a H2SO4, solution there are activation-passivation-transpassivation-passivation secondary behavior with passive film formation occurs at potential intervals of -100mV to 500mV. 15-5PH steel passivated in citric acid allows passive layers to resist corrosion.
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