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

Naceur Etteyeb (1, 2) , L Dhouibi (2) , Hisasi Takenouti (3) , E Triki (2)

1 Institut Supérieur de Biologie Appliquée de Médenine
2 LR-MAI-ENIT - Laboratoire de Mécanique Appliquée et Ingénierie [Tunis]
3 LISE - Laboratoire Interfaces et Systèmes Electrochimiques

The carbon steel electrodes were first treated by immersion in 0.1 M phenyl phosphonic acid (C 6 H 5 P(O)(OH) 2, PPA) solution during 24 or 72 hours, then they were transferred into the corrosion test solution representing interstice pore electrolyte polluted by seawater: sat. Ca(OH) 2 + 0.5M NaCl) to evaluate the protective effectiveness of the pre-treatment. The investigation was performed essentially by polarization curves and electrochemical impedance measurements with rotating disc electrode. Very high protective effect was observed with steel pre-treated during 72 hours with stationary electrode. From polarization and electrochemical impedance spectroscopy experiments, the protective efficiency was found to be in the 90–99% range for 72 hour pre-treatment. This protective property remains effective even one month immersion. EDS analysis showed the presence of the phosphorus on the steel surface, probably due to the presence of iron-PPA complex.

Mots clés: Pre-treatment; Electrochemical impedance spectroscopy; Phenyl phosphonic Acid; Protective efficiency 2

Domaines: Chimie; Autre

Naceur Etteyeb, L Dhouibi, Hisasi Takenouti, E Triki. 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. Cement and Concrete Composites, 2015, 55, pp.241 - 249. ⟨10.1016/j.cemconcomp.2014.07.025⟩. ⟨hal-01095148⟩