Experimental and theoretical study on corrosion inhibition of mild steel by meso-tetraphenyl-porphyrin derivatives in acid solution

Journal of Electrochemical Science and Engineering

article

Messaoud Meraghni¹  Touhami Lanez²  Elhafnaoui Lanez³  Lazhar Bechki⁴  AliKennoufa³ 

[1] University of El Oued, Process Engineering Department, Faculty of Technology;University of El Oued, Chemistry Department, VTRS Laboratory;VTRS Laboratory, Department of Chemistry, Faculty of Sciences, University of El Oued B.P.789;University of Ouargla, Chemistry Department

关键词: Low carbon steel;    potentiodynamic polarization;    quantum chemical method;    potential of zero charge;   

DOI  :  10.5599/jese.1400

学科分类：内科医学

来源: International Association of Physical Chemists (IAPC)

【 摘 要 】

The inhibition effect of meso-tetraphenyl-porphyrin (TPPH2), meso-tetra4-methophenyl-porphyrin TPPH2(p-Me), and meso-tetra4-actophenyl-porphyrin (TAcPPH2) on the corrosion of XC52 mild steel in aerated 0.5 M aqueous sulfuric acid solution was studied by potentiodynamic polarization experiments and quantum chemical calculations. Results from potentiodynamic polarization showed that inhibition efficiency of three compounds increased upon increasing of the inhibitor concentration and they are acting as mixed type inhibitors, having dominant anodic reactions. Adsorption of all compounds follows the Langmuir adsorption isotherm with moderate values of free energy of adsorption. Quantum chemical calculation using DFT/B3LYP method confirmed a strong bond between meso-tetraphenyl-porphyrins and mild steel surface. The inhibition mechanism was also determined by the potential of zero charge (PZC) measurement at the metal/solution interface.

【 授权许可】

CC BY