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The electrochemical quartz crystal microbalance ͑EQCM͒ was used to directly measure the dissolution rate at cathodic potentials, and thus the cathodic corrosion rate, of thin-film analogs of phases in AA2024. Thin films of pure Al, Al-4% Cu, and Al 2 Cu were studied in 0.1 M NaCl containing 0, 10 Ϫ4 , or 10 Ϫ2 M Cr 2 O 7 Ϫ2 . A range of cathodic potentials was studied for each material. The true cathodic current density was calculated from the difference of the net current density and thedoi:10.1149/1.1524172 fatcat:qkzxsptg75hrpn5ze675gbzd5a