The course of the polarization process during electrochemical tests on reinforcement corrosion


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Title: The course of the polarization process during electrochemical tests on reinforcement corrosion

Author(s): T. Jaśniok, A. Zybura

Publication: KILW

Volume: 53

Issue: 1

Appears on pages(s): 109-129

Keywords: reinforcement,corrosion

Date: 1/1/2007

The modeling of corrosion tests on steel rod reinforcement has been shown. Three cases have been carried out - passivation, general corrosion and local corrosion. The liquid acting on the reinforcement in pores of concrete is modeled by alkaline solution and water. The tests have been carried out by the polarization method using counter electrodes of three different lengths. Potential changes of the outer edges of rods have been described too. The real corrosion rate of steel has been determined in the measuring vessel. Experimentally determined distribution of potential changes has been confirmed by calculations. The potential changes are insufficient to determine the polarization range, which the real corrosion current density dependents on. On the basis of tests in the measuring vessel is has been confirmed that the values of corrosion current density in models of reinforcement which are polarized on all its length may be recognized as real. The assumed polarization range of the oblong working electrodes has been determined by comparing the corrosion current density obtained by short counter electrodes, with the current density calculated under uniform polarization conditions.

Polish Academy of Sciences, International Partner Access.

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