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Corrosion Behavior of Ultra Fine Grain Pure Magnesium for Automotive Applications
Journal Article
2012-28-0016
ISSN: 1946-3979, e-ISSN: 1946-3987
Sector:
Topic:
Citation:
Ajeet Babu, P., Nilawar, A., Vishvakarma, P., Biswas, S. et al., "Corrosion Behavior of Ultra Fine Grain Pure Magnesium for Automotive Applications," SAE Int. J. Mater. Manf. 6(1):99-104, 2013, https://doi.org/10.4271/2012-28-0016.
Language:
English
Abstract:
The contemporary challenge in automotive industry is weight
reduction. Compared to conventional automotive materials,
commercially pure magnesium is having enhanced strength-to-mass
ratio and low density, which confers to optimal requirement for
automotive applications. Amongst various other reasons such as low
hardness, low corrosion resistance also prevents it from entering
mass production. Severe plastic deformation by equal channel
angular extrusion (ECAE) is regarded as one of the prominent
methods to increase the mechanical properties of magnesium.
However, the investigation in corrosion resistance of extruded
magnesium in automotive environment is not discussed in depth. This
paper discusses the microstructure and corrosion characteristics of
commercially pure magnesium which has been extruded by ECAE at 473
k through the routes a and bc up to eight passes and
their three surfaces (extrusion direction, normal direction &
transverse direction) in detail. The corrosion experiment has been
performed using conventional electrochemical techniques such as
open-circuit potential measurements and potentiodynamic
polarization method in 3.5 wt% NaCl solution environment. The
surface morphology of the magnesium billet was examined in detail
using scanning electron microscopy (SEM) and the hardness was
measured using micro Vickers hardness tester.