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Structure and properties of diffusive titanium nitride layers produced by hybrid method on AZ91D magnesium alloy

Transactions of Nonferrous Metals Society of China 2014年第9期24卷 2767-2775页

作者： michal tacikowski Jerzy MORGIEL Monika BANASZEK Konrad CYMERMAN Tadeusz WIERZCHON Faculty of Materials Science and Engineering Warsaw University of Technology ul.Woloska 141 02-507 Warsaw Poland Institute of Metallurgy and Materials Science Polish Academy of Science ul. Reymonta 25 30-059 Kraków Poland

A diffusive titanium nitride layers were produced on AZ91 D magnesium alloy by a hybrid method which combines the titanium coating physical vapor deposition（PVD） with subsequent nitriding. The layers are composed of a thin surface zone of titanium nitrides and oxides, an intermediate titanium zone and Ti-Al-Mg type diffusive zone. Since the layers improve the corrosion resistance, the best corrosion resistance is obtained when the layers are produced on aluminum base sub-layer by oxynitriding.

关键词： magnesium alloys titanium nitride diffusive layers hybrid method

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The Effect of Tightening on the Corrosion Properties of the PVD Layers on Magnesium AZ91D Alloy

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Journal of Surface Engineered Materials and Advanced Technology 2014年第5期4卷 270-281页

作者： Janusz Kaminski michal tacikowski Agnieszka Brojanowska Beata Kucharska Tadeusz Wierzchon Faculty of Materials Science and Engineering Warsaw University of TechnologyWarsawPoland

The corrosive 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.

关键词： Magnesium Alloys Titanium Nitride PVD Layers Tightening Corrosion Resistance

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