|About this Abstract
||Materials Science & Technology 2012
||MS&T'12 Poster Session
||G6: Corrosion Resistance of E-Coat on Cerium Conversion Coated Mg, Al, and Galvanized Steel Couples
||Austin Gerlt, Carlos Castano, Surender Maddela, Matthew J O'Keefe
|On-Site Speaker (Planned)
Corrosion performance of electro-coat (E-coat) on cerium-based conversion coatings (CeCCs) deposited on to mixed-metal assembly (tri-metallic couples) was investigated by ASTM B117 neutral salt spray testing and electrochemical measurements. This was done to simulate the real world application of CeCCs to a mixed-metal assembly such as automobile and aerospace applications. Tri-metallic couples composed of both AZ31B and AZ91D magnesium alloys coupled with aluminum alloy (6016) and electro-galvanized steel (EGS) were used in this study. Tri-metallic couples were pretreated first with HNO<3> followed by Na<2>SiO<3>.5H<2>O and then immersed in a cerium solution. The coating morphology was characterized by scanning electron microscopy (SEM). The CeCCs influence the coating morphology and corrosion resistance of E-coated tri-metallic couples.
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