LEIS y SKP mapas de las etapas iniciales de corrosión localizada de AA6061-T6 en un substituto de agua de mar diluido

Gloria Acosta; Lucien Veleva

doi:10.3989/revmetalm.134

Autores/as

Gloria Acosta Department of Applied Physics, Center for Research and Advanced Studies (CINVESTAV), Unidad Mérida https://orcid.org/0000-0002-9970-7027
Lucien Veleva Department of Applied Physics, Center for Research and Advanced Studies (CINVESTAV), Unidad Mérida https://orcid.org/0000-0003-1433-2885

DOI:

https://doi.org/10.3989/revmetalm.134

Palabras clave:

AA6061-T6, Agua del océano, Corrosión, LEIS, SEM-EDX, SKP

Resumen

Mapas de Espectroscopia de Impedancia Electroquímica Localizada (LEIS) y de Sonda Kelvin de Barrido (SKP) fueron adquiridos para caracterizar las etapas iniciales de corrosión localizada de AA6061-T6 en agua de mar sustituta diluida hasta 24 h, simulando un ambiente atmosférico poco contaminado en cloruros. Ambas mediciones fueron llevadas a cabo in situ en potencial de circuito abierto. Los mapas de LEIS mostraron la distribución de la magnitud de la impedancia |Z| en la superficie de la aleación, sugiriendo una heterogeneidad en el desarrollo de sitios activos frente a la corrosión (primeras picaduras). Los mapas de SKP evidenciaron la aparición de sitios anódicos (con potencial más negativo) y catódicos en la superficie de la aleación, lo que confirmó el carácter localizado de la corrosión. El análisis SEM-EDX reveló el inicio de la disolución de aluminio, localizado en la vecindad de partículas intermetálicas de Al-Fe-Si, ricas en hierro, y en áreas con carbono segregado, todas éstas actuando como cátodos y permaneciendo en la superficie con el avance del proceso.

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