Evaluación Electroquímica de Recubrimientos Zn-Fe depositados con corriente pulsante

This work presents the electrochemical characterization to evaluate the corrosion resistance of Zn-Fe metal coating electroplated foil substrates cold-rolled steel. The coating is deposited by a function generator, an oscilloscope and an electrolytic cell of 50 ml, provided with a soluble anode of pure zinc. The reagents used were analytical grade, and the tests were performed at a temperature of 25 o C. No complexing agents were used or polishes; so that the process is environmentally clean. The electrochemical characterization measurements made with open circuit potential, linear polarization resistance and electrochemical impedance spectroscopy show that within the range of duty cycle from 87.5 to 97.5%; and with varying frequencies between 40 and 100 Hz, the effect of the reverse current pulse promotes corrosion resistance coating for frequencies of 100Hz; the samples with higher corrosion resistance was obtained in 90% duty cycle, and are shown in the content of this article.