Invited Paper SE-TuA9
Corrosion Resistance of Mechanically Reinforced Aluminium based Coatings obtained by PVD Techniques

Tuesday, October 23, 2018, 5:00 pm, Room 202C

Aluminium-based aIloy films can be used for the protection of steels against corrosion However, the mechanical properties of such coatings must be reinforced, for example by addition of transition elements, which have low diffusivity and low solubility in aluminum. Various aluminium based alloys elaborated by Electron Beam Physical Vapour Deposition (EBPVD) or magnetron sputtering techniques are characterised in terms of mechanical properties and corrosion behaviour in saline solution. The incorporation of transition metals permits to modify the mechanical or physico-chemical characteristics of aluminium coatings, so several alloying elements are compared. Evolution of microstructure of the Al based coatings is discussed versus the alloying element content. Different compositions of alloys are examined.

This presentation summarizes the main results of studies conducted in this field since the early 1990s. This is a synthesis of the main tendencies reported during the evaluation of the mechanical and corrosion properties of these alloys.

The objective is to build a reactivity classification in saline solution of several Al based coatings synthe- sized by vacuum deposition techniques. Combined with the classification of mechanical properties, these standards would become relevant guides in the choice of PVD coatings and/or alloys for applications exposed to saline environments. In our study, this guide is helpful in the synthesis of nanometric multi- layer architectures, which proves to be a promising way to combine improved mechanical properties with sacrificial character for the future coating configurations.