Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Mechanical and tribological properties of electrodeposited Ni-Mo coatings

nr katalogowy: 52689

Hard chromium coatings are widely used in aerospace, automotive, hydraulic and machinery industry to reduce friction, wear and corrosion. Electrodeposition is a frequently used technique to deposit such a coatings because is simple, low cost and low temperature. Main advantage is to possibility of relatively uniform deposition on large, complex shape elements. Nowadays hard chromium that dominates within this group coatings were characterize by good mechanical and corrosion resistance but the deposition process is toxic and carcinogenic. Many environmental friendly materials are proposed to replace electroplated chromium coatings, and one of them are nickel based alloys coatings - Ni-P [1], Ni-Mo [2], Ni-W [3] and nanocomposite coatings like Ni-P-Al2O3 [4], Ni-W-SiC [5]. Pure Ni coatings are not hard and wear resistant, but their properties could be significantly improved by alloying and reducing the grain size to nanocrystalline structure. It is reported that Ni-Mo deposits have a good corrosion resistance but there is a lack of tribological studies. For coating-substrate systems wear is not only determined by hardness as showed classical theories of friction [6]. Increase of hardness is usually associated with rise of stiffness and frequently cause change of deformation mechanisms from plastic to brittle fracture. Many studies indicate than wear depends on quotient of hardness H and modulus of elasticity E [7] which is called plasticity index. This value can be used to quantitatively assess the load that may be carried on by the coating in the elastic stress regime. Wear at the elastic state, when abrasive wear dominates is significantly lower than under plastic deformation. The value of the contact force that caused plastic deformation of the coating can be calculated from Hertz theory [8]: P R R pl E l ind = 0 68 3 ⋅ ⋅ 3 2 2 . π (1) where Eind is the reduced modulus of elasticity of coating and the [...]

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2010-3

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