Abstract
The destroying of Tafel region in many cases is not due to complication u'ith mass transfer , butdue to IR - drop effsct specially in dilute solutions ( i.e., of high resistivity) . Accordingly, thecorrosion behavior of reinforcement in reinforced concrete was investigated using electro -chemical measurements. The work was carried out with small steel rods: cleaned and previouslyoxidized embedded in resistance Portland cement concrete cylinders exposed to dry conditions' Inthis investigation a theoretical model equation has been adopted including IR- drop term:AE =AEA +RAi = -bclogicorr.+ bclog/Ai/+R /Ai/In order to determine corrosion paiameters of iystem investigated (i.e., icorr., bc, and Rc. A)equation above was based on the analysis of cathodic Polarization curve free from mass transf'ereffect .It has been found that the corrosion curent of pre- oxidized steel is higher than the cleanedone , and this corrosion rate is concrete contaminant & time of exposure dependant. because of theimportance of electrical resistance of concrete & its relationship to the corrosion rate of reinforcingsteel. An attempt was made to find this resistance from the IR-drop term in the above mentionedequation.
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