Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 24    No. 11    November 2014

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Corrosion inhibition effect of N, N′-bis (2-pyridylmethylidene)-1,2-diiminoethane on AZ91D magnesium alloy in acidic media
D. SEIFZADEH1, A. BEZAATPOUR2, R. ASADPOUR JOGHANI1

1. Physical Chemistry Research Laboratory, Applied Chemistry Department, Faculty of Science,
University of Mohaghegh Ardabili, Ardabil, Iran;
2. Inorganic Chemistry Research Laboratory, Applied Chemistry Department, Faculty of Science,
University of Mohaghegh Ardabili, Ardabil, Iran

Abstract:The inhibition effect of electrochemical noise, EIS and surface analysis to evaluate N′-bis (2-pyridylmethylidene)-1,2-diiminoethane (BPIE) Schiff base against AZ91D alloy corrosion in 0.01 mol/L HCl was investigated by different electrochemical methods. Potentiodynamic polarization curves revealed that the BPIE acts as a mixed-type corrosion inhibitor. Electrochemical impedance spectroscopy (EIS) measurements confirmed the corrosion inhibition effect of the BPIE. As the inhibitor concentration increased, the charge transfer resistance increased and the double layer capacitance decreased due to more inhibitor adsorption on the surface. The results obtained by analysis of electrochemical noise (EN) data in time and frequency domains are in good agreement with EIS and polarization results. Moreover, scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive X-ray (EDX) were used to investigate the corrosion inhibition of the BPIE. SEM images showed that the corrosion damage of the alloy surface reduced in the presence of BPIE. The intensity of the XRD peaks corresponding to magnesium-rich α phase increased in the presence of BPIE, indicating lower corrosion of alloy sample. Also, EDX analysis approved the corrosion inhibition performance of the BPIE. The studied Schiff base compound acts by physical adsorption on the alloy surface and its adsorption obeys the Langmuir isotherm.

 

Key words: AZ91D magnesium alloy; corrosion; acidic media; inhibition; Schiff base

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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