Evaluation of corrosion resistance on coatings obtained by sputtering of a chromiun cathode by electrochemical techniques
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Universidad Santo Tomás. Seccional Bucaramanga
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Se evaluó la resistencia a la corrosión de recubrimientos obtenidos por pulverización de un blanco de cromo sobre sustratos de acero AISI H13, mediante el análisis de espectroscopia de impedancia electroquímica (EIS) y curvas de polarización Tafel en una solución de NaCl al 3% en peso. Se encontró que estos recubrimientos presentan una velocidad de corrosión menor a la del sustrato, y que los datos de EIS se ajustan a un circuito eléctrico equivalente que contiene dos elementos de fase constante circuito típico para la interpretación del comportamiento de un electrodo metálico sobre el que ha sido depositado un recubrimiento aislante y poroso.
The corrosion resistance of coatings obtained by sputtering of a chromium target on substrates of steel AISI H13 was evaluated. Through the analysis of electrochemical impedance spectroscopy (EIS) and Tafel polarization curves in a solution of 3% NaCl by weight was found that these coatings have a corrosion rate lower than the substrate. Moreover, EIS data fit an equivalent electrical circuit that contains two constant phase elements; this is typical circuit for interpreting the behavior of a metal electrode on which has been deposited an insulating and porous coating.
The corrosion resistance of coatings obtained by sputtering of a chromium target on substrates of steel AISI H13 was evaluated. Through the analysis of electrochemical impedance spectroscopy (EIS) and Tafel polarization curves in a solution of 3% NaCl by weight was found that these coatings have a corrosion rate lower than the substrate. Moreover, EIS data fit an equivalent electrical circuit that contains two constant phase elements; this is typical circuit for interpreting the behavior of a metal electrode on which has been deposited an insulating and porous coating.
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AISI H13, EIS, pulverización, Tafel, velocidad de corrosión, AISI H13, EIS, sputtering, Tafel, corrosion rate
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