Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 3

Influence of surfactants on microstructure and corrosion resistance of Ni/Al2O3 coatings

nr katalogowy: 78026

Composite coatings are one possibility to increase the durability and performance of materials for different applications and protect them from detrimental effect of the environment. Metal matrix composite reinforced with ceramic particles generally find wide range of engineering applications due to their enhanced hardness, better wear and corrosion resistance when compared to pure metals or alloys [1, 2]. The most sought after method of producing these kinds of composites is electrodeposition, owing to its advantages like low cost and the operating temperature. Electrodeposition of metals reinforced with dispersoids (mainly oxides or carbides) is an important technique for production of functional coatings. Such coatings are required in different fields of industry including: machinery and various device construction, machining tools, automotive and aircraft parts etc. Nickel composite coatings containing ceramic particles are used as protective coatings [3]. The plating bath for electrodeposition of Ni/Al2O3 composite coatings is frequently used a standard Watts solution with addition of alumina powder. The amount of ceramic particles incorporated into nickel affects the microstructure and properties of electrodeposited nickel composite coatings. The structure and properties of composite coatings depend not only on the concentration, size, distribution, and nature of the reinforced particles, but also on the type of used solution and electroplating parameters (current density, temperature, pH value etc.) [1, 4]. Although the Ni/Al2O3 composite coatings have been improved significantly, certain problems persist with respect to their preparation. The volume content of alumina particles in Ni/Al2O3 coating cannot be controlled quantitatively and the particles are frequently agglomerated in the composite [5]. The small inert particles like nanoalumina are difficult to embed into deposited layer because of their dispersion difficu[...]

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