Electrochemical study of inhibitor-containing organic–inorganic hybrid coatings on AA2024

Effect of cerium on structure modifications of a hybrid sol–gel coating, its mechanical properties and anti-corrosion behavior

“…The resistive plateau at middle frequencies is representative to the resistance of the alumino-silane hybrid coating, i.e. the resistance of the electrolyte into the pores [28][29][30][31][32]. On the first hand, the pore resistance suggests that the most efficient barrier effect is obtained for an optimal cerium concentration of 0.01 M, confirming previously made conclusions based on Nyquist diagrams interpretation.…”

“…We can also underline, on Bode diagram, relative to phase angle evolutions, a phenomenon at high frequencies (%10 3 Hz), associated with both capacitance and resistance of alumino-silane hybrid coating [5,[32][33][34][35][36]. The high angle values, closed to 908, suggest an efficient barrier effect whatever the cerium concentration of the coatings.…”

High Strength Al-Alloys: Microstructure, Corrosion and Principles of Protection

“…For inhibitors, their role is to prevent a surface reaction (corrosion) and therefore, the volume of material required is much smaller than that required to actually fill the defect. Consequently, there has been considerable effort looking at "nano-containers" (Voevodin, Balbyshev et al 2003;Raps, Hack et al 2009;Tedim, Poznyak et al 2010). Water is the most obvious trigger since it can permeate most polymers.…”

Chemical Degradation of Epoxy-Polyamide Primer by Electrochemical Impedance Spectroscopy

“…Its advantages over conventional DC techniques are well documented [5][6][7][8][9][10][11]. By analyzing the impedance spectra, some important parameters might be obtained such as coating resistance, coating capacitance, electrochemical reaction resistance, and double-layer capacitance, which provide the evaluation of the coating systems [15,16]. The high-frequency impedance behavior represents the coating characteristics and that of low-frequency part of impedance represents the corrosion reactions occurring at the bottom of the pores of the coating [17][18][19].…”