The application of electrochemical impedance spectroscopy to determine the long-term effectiveness of corrosion inhibitors for steel in concrete

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

“…On the contrary, with pre-treatment, almost no corrosion is revealed; some precipitates (white heap in SEM picture) are appeared probably because of insufficient surface rinsing and this precipitate will be not highly soluble such as CaCO 3 . The EDS analysis showed the presence of the phosphorus, likely due to the formation of Fe -PPA complex.…”

“…Among them, the use of corrosion inhibitors was considered as a possible and cost effective solution [1][2][3][4][5][6][7].…”

Electrochemical Impedance Spectroscopy to Study the Carbonation Behavior of Concrete Treated with Corrosion Inhibitors

“…The alternating current (AC) signal was supplied with a 25 mV RMS for a frequency range of 100 kHz to 10 mHz with five points obtained per decade. The same frequency range is used by previous researchers for studying corrosion mechanism in reinforced concrete (Dhouibi et al 2002;Ribeiro and Abrantes 2016;Dong et al 2016). The measurements were made by using ACM (automatic corrosion monitoring) field machine that is provided with the guard ring for confinement of current.…”

“…Electrochemical impedance spectroscopy has been used by various researchers as an effective method to provide information regarding microstructure of concrete, corrosion rate and reaction at the steel-concrete interface Dhouibi et al 2002;Ismail and Ohtsu 2006;Duarte et al 2014, Montemor et al 2002Ribeiro and Abrantes 2016;Braganca et al 2014;Criado et al 2012;Trabanelli et al 2005). Electrochemical impedance spectroscopy involves the analysis of the material by applying an alternating current signal to a sweep of frequencies (Braganca et al 2014).…”

The Synergy of Electrochemistry and Concrete Material Science in Evaluating Corrosion Resistance of Wastes-Containing Reinforced Cement-Based Systems

“…Considering the investigated system, the proposed equivalent circuit (Fig. 3) and the derived best-fit parameters (Table 2) the following can be summarized: the first time constant (R p.netw C p.netw ) is related to the pore network of the bulk matrix since the capacitance values are low (range 0.002 to 2.4 µF.cm -2 ), hence can not be denoted to electrical double layer on the steel surface or to redox-reactions (Feliú V., et al 2004, Dhoubi L., et al 2002. The second time constant (R ct C f ) is related to the charge transfer resistance and double layer capacitance at the steel surface, since the capacitance is more or less stable with time for the control groups and increases for the corroding groups, which is consistent with the drop in charge transfer resistance for the latter groups.…”