Efecto del tratamiento de sellado en el comportamiento frente a corrosión de la aleación anodizada de aluminio-litio AA2099
DOI:
https://doi.org/10.3989/revmetalm.180Palabras clave:
Aleación aluminio-litio AA2099, Anodizado, Corrosión, Impedancia electroquímica, MEB, XPSResumen
El comportamiento frente a corrosión de la aleación de aluminio AA2099 anodizado en solución de H2SO4, aplicando dos densidades de corriente diferentes, 0,19 o 1,0 A·cm−2, con dos tratamientos de sellado diferentes en H2O y en Na2Cr2O7 (6% peso) a 95 °C, se ha estudiado en disoluciones de NaCl (3,5% peso) y de H2SO4 (10% vol). La aleación AA2099 se usa ampliamente en aplicaciones aeronáuticas, por tanto, se requiere que presente un buen comportamiento frente a la corrosión en ambientes de cloruro y lluvia ácida. La morfología de la superficie de la película anodizada se caracterizó por microscopía electrónica de barrido (MEB), se estudió el comportamiento frente a corrosión electroquímica empleando la impedancia electroquímica (EIS), y finalmente la caracterización de la composición química de la superficie se reveló por espectroscopía de fotoelectrones de rayos X (XPS). Se encontró que el tratamiento de sellado con Na2Cr2O7 (6% peso), genera una capa pasiva más homogénea y compacta, y tiende a aumentar la resistencia a la transferencia de carga, mejorando así el comportamiento frente a corrosión del AA2099 anodizado.
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