A coating is a covering that is applied to the surface of an object (substrate). The purpose of applying the coating may be decorative, functional, or both. Functional coatings may be applied to change the surface properties of the substrate, such as adhesion, wettability, corrosion resistance, or wear resistance.
I.T.F. has a broad experience of coating applications across several sectors of the manufacturing industry. Our technical department can provide customized solutions and fully automatic plant to manage all different operations: surface preparation, coating application, drying and curing thermal processes.
Regarding the process of coating it is important to underline that an accurate surface preparation is requested for a perfect anchorage of the coating material.
A major consideration for most coating processes is that the coating is to be applied at a controlled thickness, and a number of different processes might be used to achieve this control. The curing or drying of the applied coat are carried on with customized furnaces whose temperatures range from 70°C to 540°C.
The phosphating is a chemical process by which alters the surface of a metal material, creating the crystals are chemically bound to the substrate with the phosphatic order to exploit the properties of these compounds to improve the resistance to corrosion and promote adhesion of the subsequent coating. The phosphating is a common procedure to use iron and ferrous alloys; is the preparation treatment for coating of steel sheet universally adopted in the automotive industry, as required to achieve the very high corrosion resistance characteristics required to the shells.
The phosphating treatment uses solutions of phosphate (zinc phosphate, iron, manganese, nickel phosphates), to coat the surface with a protective crystalline layer (thickness 5-10 uM) in phosphate which confers high resistance to corrosion and improves the ' adhesion of the layer of paint due to increased surface micro-roughness. The layer obtained must be uniform, compact and composed of small crystals. The process is carried out in spray or immersion systems, normally integrated with those of degreasing. The immersion system provides superior results not only in that it is effective even in difficult to reach areas (molded, etc.), But also because the layer has different features (rounded rather than needle-like crystals).
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