Ascorbic Acid as Corrosion Inhibitor for Steel in Alkaline Media Containing Chloride IonsReport as inadecuate




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Chemical and biochemical engineering quarterly, Vol.21 No.1 March 2007. -

The investigation of nature-designed molecules and blends of naturally synthesized chemical compounds as possible inhibitor candidates for reinforcing steel in concrete is of raising interest due to the health and environmental hazards involved in the use of

most inorganic corrosion inhibitors. In the alkaline media of concrete pore solution, the oxide film is present on the surface of the reinforcing steel. The ingress of chloride ions and-or carbon dioxide into the concrete destabilizes the passive film leading to a higher

rate of metal dissolution through the appearance of localized forms of corrosion.

This study investigates pitting inhibition with ascorbic acid AA, by analyzing the polarization curves in the presence and absence of the inhibitor. Inhibition action was evaluated from its ability to suppress the cathodic reaction of oxygen reduction as well as from its ability to suppress the onset of pitting. The mechanism of the inhibitor action

was deduced by comparative interpretation of the inhibitor’s molecular properties and the data obtained from electrochemical experiments.

Reinforcing steel; corrosion; inhibition; alkaline media; ascorbic acid



Author: L. Valek - S. Martinez - M. Serdar - I. Stipanovic -

Source: http://hrcak.srce.hr/



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