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09282 Impact of Molybdate and Nitrite Anions on the Corrosion of Mild Steel

Picture for 09282 Impact of Molybdate and Nitrite Anions on the Corrosion of Mild Steel
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Product Number: 51300-09282-CP
ISBN: 09282 2009 CP
Author: Robert A. Cottis, Abdullah Al-Refaie and Robert Lindsay
Publication Date: 2009
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The effect of nitrite and molybdate anions on the corrosion of mild steel in aerated, near neutral 8.6x10-3 M (500 ppm) NaCl solution has been explored with weight loss, electrochemical, and optical microscopy techniques. Each moiety acts as an anodic inhibitor under these conditions, exhibiting a critical concentration for the onset of effective inhibition. Potentiodynamic polarization curve measurements indicate that both nitrite and molybdate act as passivating anodic inhibitors, and they appear to have little effect on the cathodic kinetics. Various binary mixtures of these anions were also examined, and a number exhibited effective inhibition. Furthermore, two mixtures were concluded to exhibit synergistic behaviour, as regards corrosion inhibition.

Keywords: mild steel, molybdate, nitrite, inhibition, synergism
The effect of nitrite and molybdate anions on the corrosion of mild steel in aerated, near neutral 8.6x10-3 M (500 ppm) NaCl solution has been explored with weight loss, electrochemical, and optical microscopy techniques. Each moiety acts as an anodic inhibitor under these conditions, exhibiting a critical concentration for the onset of effective inhibition. Potentiodynamic polarization curve measurements indicate that both nitrite and molybdate act as passivating anodic inhibitors, and they appear to have little effect on the cathodic kinetics. Various binary mixtures of these anions were also examined, and a number exhibited effective inhibition. Furthermore, two mixtures were concluded to exhibit synergistic behaviour, as regards corrosion inhibition.

Keywords: mild steel, molybdate, nitrite, inhibition, synergism
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