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This study utilized Rutherford Backscattering Spectroscopy (RBS) and Auger Electron Spectroscopy (AES) to determine the thickness and composition of corrosion films formed on magnesium alloys exposed to experimental engine coolants intended for use with creep-resistant magnesium alloy engine blocks. Knowledge on the nature of the film formed may produce a better understanding of corrosion inhibition and protection requirements for these materials. This paper will first briefly review the RBS and AES techniques as applied to the characterization of surface films on metals. It will then present results from experiments conducted with pure magnesium and two different magnesium alloys in two engine coolants.

The tube hydroforming process is being used by the automotive industry to manufacture parts that are typically produced by stamping and welding processes. The advantages of tube hydroforming over conventional processing methods (i.e. stamping and welding processes) include part-consolidation, weight saving, and improved strength and stiffness of the formed structure. However, one of the drawbacks of the process is the incomplete knowledge base of the effects of processing parameters on the final product. Two of the most significant parameters in the PSH process are the initial level of pressurization, and the amount of die displacement required to achieve the final shape. It is therefore the objective of this paper to investigate the effect of these two parameters on the final shape and thickness distribution in the tube. The paper presents the results of numerical models and experimental validation of these results.