Development/evaluation of highly corrosion resistance structural Mg die-casting alloys

针对提高大众市场运输车辆的燃料效率的受管制的需求已经针对 提高轻质结构镁合金部件的利用率。然而， 镁合金耐腐蚀是一个需要解决的重大挑战。这项建议的目的是 表明As合金化有效地提高了结构HPDC Mg-Al的本征耐蚀性 材料（例如AM 60 B）暴露在近中性盐水环境中时。科学问题 是发现As抑制阴极反应（H2析出）速率的基本性质， 含有具有金属间第二相的多相显微组织的结构Mg-Al合金的表面 和Mg固溶体基体。发现源头对于确定污染程度至关重要， 需要在压铸期间控制As的分配。这样的承诺显然需要 在物理冶金、电化学、表面改性和表面分析方面的能力

The regulated demand toward improving the fuel efficiency of mass-market transportation vehicles has targeted the increased utilization of lightweight structural Mg alloy components. However, the intrinsic susceptibility of Mg alloys to corrosion is a significant challenge that needs to be addressed. The objective of this proposal is to demonstrate that As alloying effectively improves the intrinsic corrosion resistance of structural HPDC Mg-Al material (AM60B for example) when exposed in near-neutral aqueous saline environments. The scientific issue is to discover the fundamental nature in which As inhibits the rate of the cathode reaction (H2 evolution) across the surface of a structural Mg-Al alloy containing multi-phase microstructures with intermetallic second phases and the Mg solid solution matrix. Discovering the source is of paramount importance in defining the extent to which control of As partitioning during die-casting will be required. Such an undertaking clearly requires competencies in physical metallurgy, electrochemistry, surface modification and surface analysis