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SODIUM NITRITE AS INHIBITORS FOR PROTECTION OF REBAR AGAINST CORROSION | ||
| Muthanna Journal of Engineering and Technology(MJET) | ||
| Article 1, Volume 2, Issue 1, 2013, Pages 82-96 | ||
| Authors | ||
| FirasNaif Hassan; Ali Khalil Ismael; Ahmed Rajih Hassan | ||
| Abstract | ||
| Corrosion inhibitors studies were carried out on carbon steel rebar samples under different pH conditionsand in the presence and absence of chloride ions in solution. A known amount of sodium nitrite was added asan inhibitor and the mechanism of inhibition was studied by tracking both the thermodynamic and kineticproperties of the system. The studies indicate thatInhibition efficiency decreases with increase of temperature, and there is a competition between the corrosion and passivationreactions, and the resulting open-circuit potential depends on the relative strength of the corroding and passivatingenvironments. The corrosion rate depends to a great extent on the pH of the solution. Nitrite ions act asanodic inhibitors by increasing the rate of formation of a barrier oxide film. The protective action of the nitriteions seems to be more pronounced in highly corroding environment. This is due to the mechanism of inhibition,which uses the product of the unwanted corrosion reaction and converts it into a favorable passivating one. Fora given amount of chloride, a minimum threshold concentration of nitrite is essential for protecting the steel. | ||
| Keywords | ||
| Corrosion Inhibitors; Corrosion of rebar; Sodium Nitride | ||
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