Study of Corrosion Inhibition Mechanism of Sputter-Deposited W-42Cr-5Ni and Cr-10Zr-10w Alloys by Sodium Nitrite as Green Inhibitor in 0.5 M NaCl and 1 M NaOH Solutions

  • Dhruba Babu Subedi Department of Chemistry, Tri-Chandra M. Campus, Tribhuvan University, Kathmandu
  • Durga Bhakta Pokharel Department of Chemistry, Tri-Chandra M. Campus, Tribhuvan University, Kathmandu
  • Jagadeesh Bhattarai Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu
Keywords: Green corrosion inhibitor, W-42Cr-5Ni alloy, Cr-10Zr-10W alloy, sodium nitrite, 0.5 M NaCl, 1 M NaOH

Abstract

The effect of different concentrations of sodium nitrite as a green corrosion inhibitor on the corrosion inhibition mechanism of the sputterdeposited ternary W-42Cr-5Ni and Cr-10Zr-10W alloys was studied in 0.5 M NaCl and 1 M NaOH solutions open to air at 25ºC using corrosion tests. The use of the sodium nitrite enhanced the corrosion resistance properties of both the alloys in 0.5 M NaCl and 1 M NaOH solutions. It is found that the sodium nitrite is strongly adsorbed on the surface of the sputter-deposited these two alloys by physical adsorption, not by the chemisorption. As a result the corrosion resistance property of the alloys was found to be significantly increased with increasing the concentration of the green corrosion inhibitor of sodium nitrite. The corrosion rates of the sputter-deposited W-42Cr-5Ni and Cr-10Zr-10W alloys were decreased with increasing the concentrations of sodium nitrite of 2400 ppm.

DOI: http://dx.doi.org/10.3126/ijasbt.v2i4.11531

Int J Appl Sci Biotechnol, Vol. 2(4): 537-543

 

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Abstract
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Published
2014-12-25
How to Cite
Subedi, D. B., Pokharel, D. B., & Bhattarai, J. (2014). Study of Corrosion Inhibition Mechanism of Sputter-Deposited W-42Cr-5Ni and Cr-10Zr-10w Alloys by Sodium Nitrite as Green Inhibitor in 0.5 M NaCl and 1 M NaOH Solutions. International Journal of Applied Sciences and Biotechnology, 2(4), 537-543. https://doi.org/10.3126/ijasbt.v2i4.11531
Section
Research Articles