Titanium and its alloys play important roles in industries as light metals. The applications of titanium are mainly focused on its high specific strength at elevated temperatures, and unique corrosion resistance. This fact has predetermined the wide use of its alloys in space industries, and marine engineering as well. Nowadays, titanium and its alloys are often used as key materials for corrosion protection because of the spontaneous and instant formation of a very chemically stable,highly adherent, and continuous protective oxide film on the surface.
As we know, corrosion attack is mainly limited to the outer region of a component, and very often only localized areas may need protection. A promising approach to optimize both mechanical properties and corrosion resistance is the use of surface modification technologies, particularly coating technologies. Therefore, the protective coatings of titanium combined with cheap bulk materials offering the strength and ductility are supposed to provide sufficient protection and lower the cost .
Plasma spraying is considered as the most flexible coating technique due to a wide range of coating materials to meet many different needs [7-8]. However, air plasma spraying of titanium coatings is much difficult because titanium is a very reactive metal at high temperatures due to its strong affinity with gases such as oxygen, nitrogen and hydrogen, which lead to a degradation in the coating properties. Shrouded plasma spray can be considered as a useful technology to potentially produce low oxide containing titanium coatings. The attachment itself shields the plasma jet as it exits the torch. A gas shroud envelops the plasma jet as it leaves the attachment.
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