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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Casati, R. |
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| Kočí, Jan | Prague |
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| Ali, M. A. |
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| Rančić, M. |
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| Azevedo, Nuno Monteiro |
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Dekkers, Willem
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Publications (3/3 displayed)
- 2016Effect of dissolved oxygen and immersion time on the corrosion behaviour of mild steel in bicarbonate/chloride solutioncitations
- 2016The effect of dissolved oxygen and Cl/NO2-on the corrosion inhibition of sodium nitrite in bicarbonate/chloride solution
- 2015Effect of hydrodynamics and surface roughness on the electrochemical behaviour of carbon steel in CSG produced watercitations
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document
The effect of dissolved oxygen and Cl/NO2-on the corrosion inhibition of sodium nitrite in bicarbonate/chloride solution
Abstract
<p>The inhibition of sodium nitrite on the corrosion behavior of mild steel was studied in different dissolved oxygen (DO) and nitrite concentrations under dynamic conditions using electrochemical techniques. Potentiodynamic polarization curves indicate that passivation increases with increasing nitrites and dissolved oxygen concentrations. Scanning electron microscopy (SEM) results reveal that pitting corrosion was predominant in the specimen exposed to solution containing 0.8 ppm DO. X-ray diffractometry analyses confirmed that the corrosion products were mainly FeO(OH) (goethite) and Fe<sub>2</sub>O<sub>3</sub>. The passive layer formed was more protective at 4 ppm DO concentration as compared to 0.8ppm DO due to an enhanced oxide film. The corrosion current density decreases with increasing DO in the presence of nitrites.</p>