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Faucets and taps contain internal and external sections. The internal sections are usually made of brass and ferrous alloys. Corrosion and abrasion resistance and beautiful appearance for external sections have achieved by applying a variety of coatings. Hard coatings are the common types which have been widely used because of their wear resistance and beautiful colors. Appropriate coatings with proper deposition processes are chosen due to the material of faucets. Nitrides containing simple metal such as TiN, ZrN and CrN are the first generation of PVD hard coatings which have been used for decorative purposes due to their beautiful appearance. Among common methods for deposition of these coatings, different PVD methods (Arc-PVD and sputtering) have become more attractive due to some special properties which can be obtained by them, such as getting nanostructured coating, high speed of production and good coating quality.
Extremely hard nanolayer and nanocomposite coatings, resistant to wear, erosion, as well as corrosion, are deposited onto the surface of a variety of forming tools such as die and punch, deep drawing, cold and hot forging, extrusion, die casting, and injection moulding tools to improve the surface quality of the moulds, extend their life span up to 10 times, and enhance their performance remarkably. It is worth mentioning that the deposition of above-mentioned coatings is performed by using a Hybrid PVD system which operates based on both cathodic arc and sputtering processes.
Zirconium-based conversion coating, as a suitable alternative for common phosphate and chromate coatings, are widely applied on metallic surfaces to promote the paint adhesion and improve the corrosion performance. These coatings are based on the eco-friendly compounds; furthermore, the main advantage of these coatings is no need for thermal energy which consequently leads to cost reduction.
Introduction
Wear- and corrosion-resistant super-hard nanolayer and nanocomposite coatings are widely applied onto the surface of the turbine and compressor blades in the oil, gas and aerospace industries as an alternative for the conventional coatings. It is worth mentioning that the deposition of above-mentioned coatings is performed by using a Hybrid PVD system which operates based on both cathodic arc and sputtering processes.
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