The Corrosion Behavior of Sputter-deposited W-Cr-(4-15)Ni Alloys in NaOH Solutions

  • Pom Lal Kharel Central Department of Chemistry
  • Jagadish Bhattarai Central Department of Chemistry
Keywords: Corrosion resistance, Sputter deposition, W-Cr-Ni alloy, NaOH solution, Open Circuit potential.

Abstract

The synergistic effect of chromium addition in the sputter-deposited amorphous or nanocrystalline W-Cr-(4-15)Ni alloys is studied in alkaline NaOH solutions at 25°C, open to air using immersion tests and electrochemical measurements. In 1 M NaOH solution, the addition of chromium to W-Cr-(4-15)Ni alloys containing 42-75 at % chromium increased the corrosion resistance and shifted the open circuit potential more noble so as to show higher corrosion resistance than those of alloy-constituting elements (that is, tungsten, chromium and nickel). The corrosion rates (that is, about 2-5 x 10-3 mm.y-1) of all the examined W-Cr-(4-15)Ni alloys are about two orders of magnitude lower than that of tungsten and nearly one order of magnitude lower than that of chromium metal. The open circuit potential of the W-Cr-(4-15)Ni alloys is generally increased with increasing chromium content in different concentrations of NaOH solutions. The passivity of the WCr-(4-15)Ni alloys is increased with decreasing the concentration of NaOH solutions at 25°C.

Keywords: Corrosion resistance; Sputter deposition;  W-Cr-Ni alloy;  NaOH solution; Open Circuit  potential.

DOI: 10.3126/jncs.v24i0.2380

Journal of Nepal Chemical Society, Vol. 24, 2009 Page: 3-11


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Author Biographies

Pom Lal Kharel, Central Department of Chemistry
professor, Central Department of Chemistry, T.U. Kirtipur
Jagadish Bhattarai, Central Department of Chemistry
professor, Central Department of Chemistry, T.U. Kirtipur
How to Cite
Kharel, P., & Bhattarai, J. (1). The Corrosion Behavior of Sputter-deposited W-Cr-(4-15)Ni Alloys in NaOH Solutions. Journal of Nepal Chemical Society, 24, 3-11. https://doi.org/10.3126/jncs.v24i0.2380
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