Abstract
The corrosion electrochemistry of AA7050-T7451 and Type 316 stainless steel were investigated under thin electrolyte films and droplets utilizing a coupled multi-electrode array (CMEA). The CMEA was embedded in a 7050 panel in combination with a sintered Ag/AgCl electrode which functioned as both the reference and counter electrode. This coupled multi-electrode array enabled net cathodic and anodic reaction kinetics to be monitored as a function of position, time, and electrolyte shape. Cathodic kinetics increased under thin films and droplets of electrolyte relative to full immersion. Under droplet conditions, electrodes at the droplet edge experienced an increase in oxygen reduction compared to the center of the droplet. Lastly, a dissimilar metal galvanic couple CMEA enabled an understanding of galvanic corrosion rates under atmospheric conditions. For the first time, anodes switching to cathodes due to copper replating was observed in real time.
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