JSEMAT  Vol.4 No.5 , August 2014
The Effect of Tightening on the Corrosion Properties of the PVD Layers on Magnesium AZ91D Alloy
Abstract: 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.
Cite this paper: Kaminski, J. , Tacikowski, M. , Brojanowska, A. , Kucharska, B. and Wierzchon, T. (2014) The Effect of Tightening on the Corrosion Properties of the PVD Layers on Magnesium AZ91D Alloy. Journal of Surface Engineered Materials and Advanced Technology, 4, 270-281. doi: 10.4236/jsemat.2014.45031.

[1]   Gray, J.E. and Luan, B. (2002) Protective Coatings on Magnesium and Its Alloys—A Critical Review. Journal of Alloys and Compounds, 336, 88-113.

[2]   Hoche, H., Schroeder, H.-J., Scheerer, H., Broszeit, E. and Berger, C. (2002) Tribological Studies of CrN Coated Magnesium AZ91 at Temperatures up to 250. Advanced Engineering Materials, 4, 42-51.<42::AID-ADEM42>3.0.CO;2-E

[3]   Hollstein, F., Wiedemann, R. and Scholz, J. (2003) Characteristics of PVD-Coatings on AZ31hp Magnesium Alloys. Surface and Coatings Technology, 162, 261-268.

[4]   Hoche, H., Blawert, C., Broszeit, E. and Berger, C. (2005) Galvanic Corrosion Properties of Differently PVD-Treated Magnesium Die Cast Alloy AZ91. Surface and Coatings Technology, 193, 223-229.

[5]   Altun, H. and Sen, S. (2005) The Effect of DC Magnetron Sputtering AlN Coatings on the Corrosion Behaviour of Magnesium Alloys. Surface and Coatings Technology, 197, 193-200.

[6]   Zhou, H., Chen, F., Yao, B., Han, G. and Jawid, A. (2007) Properties of the TiN Coatings on Previously Ti Ion-Implanted Magnesium Alloy Substrate. Surface and Coatings Technology, 201, 6730-6733.

[7]   Altun, H. and Sinci, H. (2008) Corrosion Behavior of Magnesium Alloys Coated with TiN by Cathodic Arc Deposition in NaCl and Na2SO4 Solutions. Mater Character, 59, 266-270.

[8]   Tacikowski, M., Rudnicki, J., Walkowicz, J. and Wierzchoń, T. (2009) Structure and Properties of Composite Layers on AZ91D Magnesium Alloy Produced by the Hybrid Surface Treatment. NETSU-SHORI. Journal of The Japan Society for Heat Treatment, 49, 365-368.

[9]   Tacikowski, M., Kamiński, J., Rudnicki, J., Borowski, T., Trzaska, M. and Wierzchoń, T. (2009) The Effect of the Diffusive, Composite Chromium Nitride Layers Produced by a Hybrid Surface Treatment on the Corrosion Behavior of AZ91D Magnesium Alloy. Vacuum, 85, 938-942.

[10]   Tacikowski, M. and Wierzchoń, T. (2011) Controlling of Corrosion Resistance of Magnesium Alloys Using Hybrid Method. Corrosion Protection, 2, 40-43.

[11]   Hoche, H., Allebrandt, D., Scheerer, H. and Berger, C. (2007) Engineering and Design of Wear and Corrosion Resistant PVD Coatings Regarding the Exceptional Properties of Magnesium Substrates. Plasma Processes and Polymers, 4, 568-573.

[12]   Fenker, M., Balzer, M. and Kappl, H. (2006) Corrosion Behavior of Decorative and Wear Resistant Coatings on Steel Deposited by Reactive Magnetron Sputtering—Tests and Improvements. Thin Solid Films, 515, 27-32.

[13]   Tacikowski, M. (2012) Patent Application No. P-401207, Poland.

[14]   Tacikowski, M., Banaszek, M. and Smolik, J. (2014) Corrosion-Resistant Composite Titanium Nitride Layers Produced on the AZ91D Magnesium Alloy by a Hybrid Method. Vacuum, 99, 298-302.