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There is a correlation between the corrosion resistance, structure, roughness and the porosity of TaN sputtered films.

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Preparation of coatings simultaneously exhibiting high hardness and enhanced fracture resistance is a hot topic, as nowadays used ceramic protective coatings show difficulties to cope with increased demands due to their inherent brittleness. Material exhibiting seemingly contradictory combination of mechanical properties-high hardness and moderate ductility enhancing the fracture resistance-was recently predicted by ab initio calculations in the crystalline X2BC system. The presented study is focussed on the study of the influence of the C/W ratio on the microstructure, the content of different chemical bonds and the mechanical properties of W-B-C coatings prepared by magnetron sputtering at moderate temperature. It was shown that change of the deposition conditions to achieve different C/W ratios influences the energy flux and momentum transfer to the coating. The coating with the lowest C/W ratio experienced the highest energy flux and momentum transfer, which resulted in a dense coating microstructure. The microstructure progressively coarsened as the C/W ratio increased, i.e. as

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Carbon nanotubes (CNTs) have high chemical stability, unique hollow nanotube structure, and are believed to be ideal materials for fabricating composites. In this study, Ni–P and Ni–P‐CNT composite coatings were fabricated by electroless plating. Scanning electron microscopy was used to characterize the coatings. The corrosion behavior of Ni–P and Ni–P‐CNT coated samples were evaluated by polarization curves and electrochemical impedance spectroscopy in 3.5 wt% NaCl and 0.1 M H2SO4 aqueous solutions at room temperature. The results indicated that incorporation of CNTs in the coating significantly increased corrosion resistance. The role of CNTs in improvement of corrosion resistance of the coating was also discussed.

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