Color maps of the currents from the CMEA arranged in a 2D fastener geometry over the 24 h exposed under a 70 μm thin film of 0.6 M NaCl solution at 98% RH during wet/dry cycle at 30°C with a gap of ∼100 μm between the AA7050 and the steel fastener. (a) shows the color maps at a higher current scale than (b). Red indicates positive values (net anodic), blue indicates negative values (net cathodic), and white indicates zero current (electrodes with a net galvanic current close to zero).