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To insure that the corrosion protective behavior of Mg-rich primers over Al aircraft alloys is properly understood, multiple electrochemical techniques have been utilized to characterize the behavior of this class of Cr-free coatings. Many substitutes for Cr-containing pretreatments for Al alloys such as AA 2024 T-3 or AA7075 T-6 have been put forth as performing as well as the present Cr-containing...