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Improving the performance of magnesium alloys for automotive applications

机译：改善汽车用镁合金的性能

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摘要

Magnesium and its alloys are attractive to the automotive industry for their inherent light-weight which leads to highly fuel-efficient design. However, due to a low melting temperature (650℃), magnesium has relatively poor elevated temperature mechanical properties, e.g., creep. This has, therefore, restricted its use in applications such as engine components. Magnesium is also a highly reactive metal and has inherently poor corrosion and wear resistance. Improved corrosion and wear performance can be obtained through alloying and microstructural engineering. However, for enhanced corrosion and tribological properties, the use of surface engineering techniques involving coatings is mandatory. Plasma Electrolytic Oxidation (PEO), also known as "Micro-Arc Oxidation (MAO)", has been used to successfully produce oxide layers on magnesium alloys with excellent tribological and corrosion resistant properties. By controlling the PEO process parameters, uniform, relatively pore-free and well adhered coatings can be produced which can provide adequate corrosion protection. The coating requirements for good tribological properties are somewhat different than for good corrosion performance. However, good tribological performance combined with good corrosion performance can be obtained through control of the PEO processing parameters.
机译：镁及其合金因其固有的轻质性而对汽车工业具有吸引力，从而带来了高燃油效率的设计。但是，由于熔化温度低（650℃），镁具有相对较差的高温机械性能，例如蠕变。因此，这限制了它在诸如发动机部件的应用中的使用。镁也是一种高反应性金属，其固有的耐腐蚀性和耐磨性差。通过合金化和微结构工程可以改善腐蚀和磨损性能。但是，为了增强腐蚀和摩擦学性能，必须使用涉及涂层的表面工程技术。等离子体电解氧化（PEO），也称为“微弧氧化（MAO）”，已被成功用于在镁合金上成功制备具有优异的耐磨性和耐腐蚀性能的氧化层。通过控制PEO工艺参数，可以生产出均匀，相对无孔且粘附良好的涂层，从而可以提供足够的腐蚀防护。良好的摩擦性能对涂层的要求与良好的腐蚀性能有所不同。然而，通过控制PEO加工参数可以获得良好的摩擦性能和良好的腐蚀性能。

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