Protection of reinforcement steel corrosion by phenyl phosphonic acid pre-treatment \PART\ I: Tests in solutions simulating the electrolyte in the pores of fresh concrete
By N. Etteyeb and L. Dhouibi and H. Takenouti and E. Triki
Published in Cement and Concrete Composites
NULL
2015
Abstract
The carbon steel electrodes were first treated by immersion in 0.1 M phenyl phosphonic acid (C6H5P(O)(OH)2, PPA) solution during 24 or 72 h, then they were transferred into the corrosion test solution representing interstice pore electrolyte polluted by seawater: (sat. Ca(OH)2 + 0.5 M NaCl) to evaluate the protective effectiveness of the pre-treatment. The investigation was performed essentially by polarisation curves and electrochemical impedance measurements with rotating disc electrode. Very high protective effect was observed with steel pre-treated during 72 h with stationary electrode. From polarisation and electrochemical impedance spectroscopy experiments, the protective efficiency was found to be in the 90
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