Abstract

GORLACH, I.A.. The Application of High Velocity Air Fuel Process for the Deposition Coatings. R&D j. (Matieland, Online) [online]. 2008, vol.24, pp.9-16. ISSN 2309-8988.

Most commonly used methods of anticorrosion protection of large metal structures are painting and metal spraying. Painting is considerably cheaper than metal spraying, but the latter gives structures protection for up to 20 years and reduces maintenance costs substantially. This paper presents a development of the thermal spraying system built on the principles of the high velocity air flame (HVAF) process. The designed thermal gun used for thermal spraying of Zn-Al wire, which is molten in the combustion zone and accelerated by a supersonic flow in the converging-diverging nozzle. HVAF sprayed coatings showed considerably higher bond strength than coatings obtained by the conventional methods, indicating the advantage of this method in areas where the adhesion strength is critically important. The highly dense structure of the coating obtained with HVAF eliminates a need for a top sealer coat, which is typically applied on sprayed coatings to extend service life. In addition, the developed thermal spray system provides competitive spray rates, high deposition efficiency, and the process can be easily performed on-site. Lower operating costs of the HVAF process in comparison with other high velocity systems makes this technology viable for thermal spraying applications for anticorrosion protection.

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