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Influence of polyvinylpyrrolidone on rebar corrosion in sulphate solution
A. Ali Gürten,Emel Bayol,Kadriye Kayakirilmaz 국제구조공학회 2009 Steel and Composite Structures, An International J Vol.9 No.1
This paper reports the results of an experimental investigation of the polyvinylpyrrolidone (PVP) influence on the steel reinforcement corrosion and compressive strength of concretes in sulphate medium. The effect of admixture of PVP in concrete on the corrosion resistance of steel reinforced concrete was assessed by measuring electrochemical test during 60 days immersion in two different external solutions. AC impedance spectrum indicated that the resistance of PVP mixed electrodes were higher than those without PVP. The compressive strength of concrete specimens containing PVP was measured and an increase of 19%~24% was observed.
A. Ali Gu¨ rten,Hu¨ lya Keles,Emel Bayol,Fatma Kandemirli 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Inhibition effect of Schiff base namely 1-(2-hydroxybenzylidene)-3-(2,5-dioxoimidazolidin-4-yl) urea(ALS) was studied on carbon steel corrosion in 1.0 M HCl by using the electrochemical impedancespectroscopy (EIS), potentiodynamic polarization and linear polarization (LPR) and quantum chemicalstudy. The values of activation energy (Ea), equilibrium constant (Kads), adsorption free energy DG8ads,adsorption enthalpy DH8ads and adsorption entropy DS8ads were discussed. The adsorption of inhibitor onmetal followed Langmuir’s adsorption isotherm. The thermodynamic parameters of adsorption revealthat there is a strong interaction between inhibitor and carbon steel. The highest inhibition efficiencywas observed 5.0 10 4 M ALS concentration at 318 K. SEM and EDX observations confirmed theexistence of protective inhibitor film on metal surface. Quantum chemical study supports thecomparative inhibition effect of ALS.