Nickel-phosphorus amorphous alloys

Ratzker, M., Lashmore, D. S., and Pratt, K. W., Electrodeposition and Corrosion Performance of Nickel-Phosphorus Amorphous Alloys, Plating and Surface Finishing, Vol. 76, 1986, p. 74. 

Weber, T. A., and Stillinger, F. H., Interactions, local order, and atomic rearrangement kinetics in amorphous nickel-phosphorus alloys. Phys. Rev. B 32,5402 (1985). 

The surface activation consisting of zinc deposition, heat treatment, and subsequent leaching of zinc (63, 64) was applied to different amorphous iron-, cobalt-, nickel-, and palladium-based alloys (63, 64). SEM measurements indicated the formation of a porous surface layer. Cyclic voltammetric examinations suggested an increase of surface area by about two orders of magnitude. Heat treatments at higher temperatures resulted in thicker, more porous surface layers and higher electrocatalytic activities (Table II). Palladium-phosphorus alloys with Ni, Pt, Ru, or Rh proved to be the best specimens. Pd-Ni-P with 5% Ni, after treatment at 573 K, exhibited even higher activity than that of the Pt-Pt electrode (Table II). These amorphous alloy electrodes were active in the oxidation of methanol, formaldehyde, and sodium formate. 

Ziewiec et al. [24] reported on the preparation, thermal stability and glass-forming ability of copper-nickel-phosphorus alloys. They found that, depending on the composition, melt spinning may result in either amorphous or partially crystalline systems, whose thermal behaviour was characterized by DSC, DTA, andXRD. 

Metals are very commonly used materials in various technologies and applications. Properties of metallic materials are shaped by their composition and structure. Moreover, most natural metals are foxmd in chemical combination with other elements. In the current study, resistance to electrochemical corrosion tests were applied to metallic materials with different properties and structures aluminum (Al), aluminum with a surface layer of oxide aluminum (AI2O3), iron (Fe), S235JR steel, nickel (Ni), microcrystalline nickel (Nim), nanocrystaUine nickel (Nin), and amorphous alloy of phosphorus-nickel (NiP). The choice of these materials was due to the universality of their applications in technology. 

Electrochemical corrosion characteristics of nickel were carried out by potentiodynamic polarization and impedance spectroscopy methods. Corrosion tests of nickel produced by electrocrystallization were ap>plied to its micrometric (Nim) and nanometric (Ni ) crystalline structures and for NiP amorphous alloy of nickel with phosphorus at content of 10.7% by weight (Eftekhari, 2008), (Kowalewska Trzaska, 2006). 

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