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Presented by Sean Fowler, Senior Technical Director, Q-Lab
As car companies shift to lightweight materials to increase fuel efficiency and improve performance of batteries in electric vehicles, use of aluminum alloys is increasing due to their strength and light weight versus steel. When aluminum alloys are substituted for steel, corrosion protection practices and processes in vehicle design and manufacturing must be reevaluated and in many cases redesigned. Coating systems on aluminum substrates, for example, require different pretreatments than systems on steel. Evaluating these systems and processes requires test protocols that are both realistic and rapid.
SAE China previously developed a test method for steel substrates that delivered an optimal combination of correlation to outdoor corrosion test protocols and speed. By combining aspects of several methods, the Corrosion Accelerated Test with Controlled Humidity (CATCH) cycle performed better than other well-known cycles used in the automotive industry in a previous study on steel substrates. In the current study, this cycle was tested on more than 1000 specimens representing 5000 and 6000 series aluminum, three types of pre-treatments, three types of electrophoretic coatings, with and without topcoats.
After achieving excellent correlation to two types of outdoor tests, a second study was done in an attempt to increase the speed of the test while maintaining correlation. The results of these studies will be presented.
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This webinar will be presented in English.
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