Development of an Al3+ ion-selective microelectrode for the potentiometric microelectrochemical monitoring of corrosion sites on 2098−T351 aluminum alloy surfaces

A novel potentiometric Al3+−ion selective microelectrode (ISME), with internal solid contact, based on the use of a neutral carrier morin as ionophore is reported. The ability ISME to image local ion concentration distributions was tested aluminum alloy surfaces freely corroding in an aqueous solution containing chloride ions. then used sensing tip for scanning electrochemical microscopy (SECM) operation monitor reactive sites associated dissolution that developed 2098−T351 Al−Cu−Li result welding by Friction Stir Welding (FSW) process. detected differences concentrations Al3+ species arising from (base material) and coupled weld joint/heat affected zones (WJ/HAZ) produced FSW More active domains were found HAZ regions WJ, more specially advancing side (AS). These results demonstrate Al3+−ISME presented this work can be corrosion alloys combined chemical spatial resolution.