Initiation and inhibition of pitting corrosion on reinforcing steel under natural corrosion conditions
By Wanees, S. Abd El; Radwan, A. Bahgat; Alsharif, M. A.; Haleem, S. M. Abd El
Published in Materials Chemistry and Physics
NULL
2017
Abstract
Abstract Initiation and inhibition of pitting corrosion on reinforcing steel in saturated, naturally aerated Ca(OH)2 solutions, under natural corrosion conditions, are followed through measurements of corrosion current, electrochemical impedance spectroscopy and {SEM} investigation. Induction period for pit initiation and limiting corrosion current for pit propagation are found to depend on aggressive salt anion and cation-types, as well as, concentration. Ammonium chlorides and sulfates are more corrosive than the corresponding sodium salts. Benzotriazole and two of its derivatives are found to be good inhibitors for pitting corrosion of reinforcing steel. Adsorption of these compounds follows a Langmuir adsorption isotherm. The thermodynamic functions ?E?, ?H? and ?S? for pitting corrosion processes in the absence and presence of inhibitor are calculated and discussed.
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