Abstract
The effect of sodium tungstate on the passivation behavior of grille sheet made by mild steel was studied using corrosion tests and electrochemical measurements in 1 M HCl, 0.5 M NaCl and 1 M NaOH solutions, open to air at 25 °C. The grille sheet showed the highest corrosion resistance properties in 1 M NaOH solution as compared with 1 M HCl and 0.5 M NaCl solutions. The corrosion resistance properties of the steel sheet was decreased with increasing the concentration of sodium tungstate up to 800 ppm and its corrosion inhibition efficiency was increased with increasing the concentration. The open circuit potential of the mild steel sheet was more negative value in 0.5 M NaCl than that in 1 M HCl, whereas more positive potential value was observed in 1 M NaOH than in 0.5 M NaCl solution. It was found that the mild steel sheet used in the study was found to be more passive in 1 M NaOH than in 1 M HCl and 0.5 M NaCl solutions. Hence, a more stable anodic passive film was formed on the surface of the steel sheet in 1 M NaOH than those in 1 M HCl and 0.5 M NaCl solutions from electrochemical measurements.Int J Appl Sci Biotechnol, Vol 4(2): 183-190
Highlights
Corrosion is an undesirable phenomenon which destroys the properties of metallic materials and shortens their life (Bhattarai, 2010)
The result indicated that the adsorption process obeyed Langmuir adsorption isotherm to explain the Electrochemical measurements Electrochemical measurements were carried out for a better understanding of the corrosion behavior as well as the anodic passivity of Nepalese mild steel sheet in 1 M HCl, 0.5 M NaCl and 1 M NaOH solutions open to air at 25±1°C in absence and presence of sodium tungstate as a green corrosion inhibitor
These results revealed that the grille sheet used to carry out present research work is found to be more passive in 1 M NaOH solution than in 1 M HCl and 0.5 M NaCl solutions
Summary
Corrosion is an undesirable phenomenon which destroys the properties of metallic materials and shortens their life (Bhattarai, 2010). An attempt was made to study the effects of varying concentrations of sodium tungstate on the passivation behavior of the mild steel grille sheet in 0.5 M NaCl solution at 25±1°C employing corrosion tests, Practical criteria for the selection of corrosion inhibitors inhibition mechanism and electrochemical measurements.
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