Study of the biological films formed during the pitting of aluminium in human plasma.

摘要: Film formation during the pitting corrosion of aluminium in human plasma is studied using conventional electrochemical techniques complemented with scanning electron microscopy as well energy-dispersive x-ray, microprobe and immunoelectrophoresis analysis. The anodic polarization curve at 37 degrees C shows a passive region related to low rate that extends up -0.66 V (s.c.e.). At more positive potential values than V, breakdown oxide protective film occurs due chloride anions, leading an intense localized dissolution metal (pitting corrosion). Scanning surface reveals thick non-adherent precipitate covering pits crystallographic feature. Energy-dispersive x-ray analysis show presence aluminium, carbon signals. Immunoelectrophoresis resuspended physiological solution strong protein denaturization. Results suggest products are formed by interaction saturated AlCl3 salt present within adsorbed proteins.