RT Journal Article
T1 Investigation of HVOF spraying on magnesium alloys
A1 Parco, Maria
A1 Zhao, Lidong
A1 Zwick, Jochen
A1 Bobzin, Kirsten
A1 Lugscheider, Erich
AB Magnesium alloys are promising alternatives to other lightweight alloys such as aluminum alloys due to their high specific strength and stiffness. However, the use of magnesium alloys is limited by their poor wear behaviour and corrosion performance. Recent studies have shown an enormous potential of thermal spray techniques for the surface modification of Mg alloys. The high particle velocities and moderate temperatures achieved by the High Velocity Oxy-Fuel (HVOF) flame spray process lead to very dense coatings with outstanding wear behaviour and superior bond strengths in comparison to other thermal spray processes. In this study, two Mg alloys AZ91 and AE42 were coated using the HVOF spray process. The substrates were compared in terms of the measured bond strength and the observed adhesion mechanisms of the coating. Furthermore, the coatings were characterized concerning their corrosion performance on AZ91 substrates. It was found that dense WC-Co coatings could be applied on Mg alloy substrates using the HVOF spray process. The high kinetic energy of the WC-Co particles led to a "self roughening" effect on the substrate, enabling the deposition on polished Mg alloy substrates. The coatings showed a very good adhesion to the substrates. The corrosion tests showed that the unsealed WC-Co coatings could not improve the corrosion performance of Mg alloys. In contrast, the duplex coating system with an Al bond coat improved significantly the corrosion resistance of Mg alloys. The sealed coatings showed a very good corrosion behaviour.
SN 0257-8972
YR 2006
FD 2006-12-04
LK https://hdl.handle.net/11556/3217
UL https://hdl.handle.net/11556/3217
LA eng
NO Parco , M , Zhao , L , Zwick , J , Bobzin , K & Lugscheider , E 2006 , ' Investigation of HVOF spraying on magnesium alloys ' , Surface and Coatings Technology , vol. 201 , no. 6 , pp. 3269-3274 . https://doi.org/10.1016/j.surfcoat.2006.06.047
NO The investigations were promoted from funds of the German Federal Ministry of Economic Affairs and Employment via the Federation of Industrial Research Associations (AiF No. 13.769 N) and were supported by the Research Association for Welding and Allied Processes of the DVS. We would like to record our appreciation of this promotion and support.
DS TECNALIA Publications
RD 30 jul 2024