Improving The Performance Of Magnesium
Alloys For Automotive Applications
Author(s)
R. O. Hussein & D. O. Northwood
Abstract
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°C), 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.
Keywords: magnesium alloy, automotive applications, creep, corrosion, wear,
PEO coatings.
Keywords
magnesium alloy, automotive applications, creep, corrosion, wear,
PEO coatings.
Related Book
Other papers in this volume
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