Abstract
The aim of the present study was to develop the hybrid method which allows producing highly corrosion-resistant composite titanium nitride layers on the AZ91D magnesium alloy. The hybrid method combines the deposition of composite titanium nitride layers using the PVD methods with the final tightening of the layers by a simple chemical-type treatment. The tightened multilayer obtained by the hybrid treatment is composed of a TiN surface layer and an aluminum sub-layer diffusively bonded with the substrate, separated by a thin transition titanium sub-layer. The effect of the composite titanium nitride layers on the corrosion resistance of the AZ91D alloy was examined by electrochemical methods. The results of the examinations show that the hybrid method yields an outstanding improvement of the corrosion resistance manifested by the corrosion potential shift by about 1300 mV. The tightening of the composite titanium nitride layers plays the crucial role in achieving this significant improvement of the corrosion resistance.
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