TY - JOUR
T1 - Amide Substituted Zinc Centered Macrocyclic Phthalocyanines for Corrosion Inhibition of Mild Steel in Hydrochloric Acid Medium
AU - Khan, Fasiulla
AU - Sudhakara, Sarvajith Malali
AU - Puttaigowda, Yashoda Malgar
AU - Pushpanjali,
N1 - Funding Information:
Sarvajith Malali Sudhakara acknowledges the Manipal Academy of Higher Education, India, for providing the TMA Pai fellowship.
Publisher Copyright:
© 2022, Allerton Press, Inc.
PY - 2022/12
Y1 - 2022/12
N2 - Abstract: The present work describes the corrosion inhibition of mild steel—one of the metals widely utilized in industrial processes, in 0.25 M hydrochloric acid, using an amide substituted macrocyclic zinc phthalocyanine (TAZnPc). The corrosion inhibition efficiency was studied via potentiodynamic polarization technique and electrochemical impedance spectroscopy in a temperature range of 303 to 323 K, with the concentration of the inhibitor of 0.625–2.5 mM. The electrochemical study reveals that TAZnPc acts as mixed inhibitor, and the inhibition efficiency was found to increase with increasing the inhibitor concentration and decreasing temperature. The studied inhibitor showed the utmost inhibition efficiency of 86.48% at its optimum concentration of 5 mM. The excellent inhibitory performance is attributed to both the physisorption and chemisorption processes of adsorption of TAZnPc on the surface of mild steel. It was found that it followed the Langmuir adsorption isotherm. The results obtained by both potentiodynamic polarization technique and electrochemical impedance spectroscopy methods were in good agreement with each other. The surface morphology of the mild steel surface was studied by taking scanning electron microscope images, energy-dispersive X-ray spectroscopy and atomic force spectroscopy images without and with TAZnPc in 0.25 M HCl.
AB - Abstract: The present work describes the corrosion inhibition of mild steel—one of the metals widely utilized in industrial processes, in 0.25 M hydrochloric acid, using an amide substituted macrocyclic zinc phthalocyanine (TAZnPc). The corrosion inhibition efficiency was studied via potentiodynamic polarization technique and electrochemical impedance spectroscopy in a temperature range of 303 to 323 K, with the concentration of the inhibitor of 0.625–2.5 mM. The electrochemical study reveals that TAZnPc acts as mixed inhibitor, and the inhibition efficiency was found to increase with increasing the inhibitor concentration and decreasing temperature. The studied inhibitor showed the utmost inhibition efficiency of 86.48% at its optimum concentration of 5 mM. The excellent inhibitory performance is attributed to both the physisorption and chemisorption processes of adsorption of TAZnPc on the surface of mild steel. It was found that it followed the Langmuir adsorption isotherm. The results obtained by both potentiodynamic polarization technique and electrochemical impedance spectroscopy methods were in good agreement with each other. The surface morphology of the mild steel surface was studied by taking scanning electron microscope images, energy-dispersive X-ray spectroscopy and atomic force spectroscopy images without and with TAZnPc in 0.25 M HCl.
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U2 - 10.3103/S1068375523010076
DO - 10.3103/S1068375523010076
M3 - Article
AN - SCOPUS:85147152894
SN - 1068-3755
VL - 58
SP - 613
EP - 624
JO - Soviet surface engineering and applied electrochemistry
JF - Soviet surface engineering and applied electrochemistry
IS - 6
ER -