properties of PVD TiN-Ti-Al type composite titanium nitride layer with titanium
and aluminium sub-layers system on the AZ91D magnesium alloy and its sub-layers
were investigated by using polarization method and impedance spectroscopy,
specifically, in terms of the hydrothermal tightening effect. The aim was to
explain the mechanisms which contribute to high anticorrosive properties
obtained by hydrothermal tightening. It was stated that the hydrothermal
treatment changes the surface topography of the examined layers, most probably
due to the formation of a continuous titanium oxides film. Tightening
significantly modifies the corrosion resistance of the particular component
sub-layers of the TiN-Ti-Al layer which exhibits optimum electrochemical
parameters. It was shown that the increase of the electrochemical parameters is
controlled by tightening of the outside titanium nitride layer, whereas the
aluminium sub-layer plays a critical role in creating proper conditions for the
hydrothermal tightening of titanium nitride.
Cite this paper
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