Abstract
Abstract This study investigates the development of chromate-free corrosion protection systems for AA7075-T6 ([7B]) based on the concept of system approach interface engineering (SAIE) by means of chemical and plasma techniques. An anode magnetron-enhanced direct current (DC) cathodic plasma process was used to enhance the interfacial bonding and the protection offered by a cathodically electrodeposited, epoxy-based primer (E-coat) on [7B]. Corrosion test results indicated that superior corrosion properties were achieved on [7B] with the aid of plasma interface engineering, tailoring specific properties of the interfaces. When tested in SO2 salt spray, several of these plasma-modified systems outperformed, and many of them performed comparably to the controls used in this study: chromate conversion-coated and then Deft primer-coated (Deft 44-GN-36) [7B] panels, as well as chromate conversion-coated and then cathodic E-coated [7B] panels. When tested by the Prohesion salt spray method, the corrosion protec...
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