Corrosion behavior of sputter-deposited W-Mo alloys in NaOH solutions
Date
2010
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Department of Chemistry
Abstract
The corrosion behavior of the sputter-deposited nanocrystalline WMo
alloys
is
studied
after
immersion
for
24-29
h
in
different
concentrations
of
NaOH
solutions
at
25
o
C, open to air by using corrosion tests and open
circuit potential measurements. Molybdenum metal acts synergistically
with tungsten in enhancing the corrosion resistance of the sputter-deposited
W-Mo alloys so as to show the lower corrosion rates than those of alloyconstituting
elements
(that
is, tungsten and molybdenum) after immersion
for 24-29 h in NaOH solutions. In general, the open circuit potentials of all
the examined W-Mo alloys are shifted to the more positive (noble)
direction with increasing the molybdenum content in the alloys. The
stability of the spontaneous passive films of the binary W-Mo alloys is
decreased with increasing the concentrations of NaOH solutions. However,
the corrosion rates of all the examined W-Mo alloys are almost
independent of concentrations of NaOH solutions (that is, 0.01 M, 0.1 M
and 1 M NaOH).
Description
Keywords
Metallic alloys, Electrochemistry