Metal Finishing Guide Book

2012-2013

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ALLOYS DEPOSITED BY CHEMICAL VAPOR DEPOSITION The Air Force Research Laboratory (AFRL) evaluated aluminum coatings applied through Atmospheric Pressure Chemical Vapor Deposition (APCVD).9 Environmentally benign CVD processes using triethylaluminum as a precursor for producing high-quality aluminum coatings was explored. While promising, this process involves special high-cost, equipment. Considerable further development from a process standpoint would likely be necessary to implement this process for high-volume applications such as electrical connector shells. ALLOYS DEPOSITED BY MOLTEN SALT BATH PROCESSES An aluminum-manganese molten salt plating process was explored under funding from the Environmental Security Technology Certification Program (ESTCP), but the process was plagued by inconsistent bath composition, visible fumes, and excessive crust formation [Ref. 10]. In addition, this process operated at a very high temperature, which is likely to affect the properties of aluminum shells. While this technology is promising, considerable further development from a process standpoint would be necessary to implement this process for electrical connector shells. Figure 1. Galvanic series, showing position of cadmium and viable alternative metals. (Circled area: materials providing sacrificial protection.) 1 ALLOYS DEPOSITED BY IONIC LIQUID PROCESSES As an alternative to the molten salt bath process mentioned above, the use of ionic liquids as an electrolyte to plate aluminum is under investigation. 5,11 Ionic liq407

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