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. (January 2015)

• Record Type: Journal Article
• Authors: Etteyeb, N.; Dhouibi, L.; Takenouti, H.; Triki, E.
• Is Part Of: Cement & concrete composites. Volume 55(2015)
• Page Start: 241
• Page End: 249
• Publication Date: 2015-01
• Subjects: Pre-treatment -- Electrochemical impedance spectroscopy -- Phenyl phosphonic acid -- Protective efficiency; Composite-reinforced concrete -- Periodicals; Concrete -- Periodicals; Composite materials -- Periodicals; Composites de ciment -- Périodiques; Béton -- Périodiques; Composites -- Périodiques; Béton léger -- Périodiques; Cement composites; Composite materials; Composite-reinforced concrete; Concrete; Lightweight concrete; Periodicals; Electronic journals; 620.135
• DOI: 10.1016/j.cemconcomp.2014.07.025
• Languages: English
• ISSNs: 0958-9465

Abstract

Abstract: The carbon steel electrodes were first treated by immersion in 0.1 M phenyl phosphonic acid (C6 H5 P(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 90–99% range for 72 h 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.