Volume 14, Issue 4 (3-2025)
مهندسی خوردگی 2025, 14(4): 38-38 |
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Ebrahimifar H, Zandi P, Mohsenifar F. Effect of Concentration of Al2O3 Particles in
Plating Bath on Microstructure and Corrosion
Behavior of Zn-Co-Al2O3 Composite Coating. مهندسی خوردگی 2025; 14 (4) :38-38
URL: http://journal.ica.ir/article-1-224-en.html
URL: http://journal.ica.ir/article-1-224-en.html
Associate Professor, Department of Materials Engineering, Faculty of Mechanical and Materials Engineering, Graduate University of Advanced Technology & Associate Professor, Department of Materials Engineering, Faculty of Mechanical and Materials Engineering, Graduate University of Advanced Technology
Abstract: (43 Views)
Metal-based composite coatings with ceramic particles can be used to improve the mechanical and
corrosion properties of steels. In this research, Zn-Co-Al2O3 composite coating was applied on st37
steel substrate by electroplating method. The microstructure and corrosion behavior of the coating was
investigated by changing the concentration of alumina particles in the bath. Coating was done at
concentrations of 50, 60, 70, 80, 85 and 90 g/l of alumina. A scanning electron microscope (SEM) was
used to investigate the microstructure and observe the morphology. In order to evaluate the corrosion
resistance, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests were
carried out for both coated and uncoated samples in 3.5% NaCl. Microstructure analysis showed that
the best concentration of alumina for precipitation is 70 g/l, and in this concentration, coating had good
adhesion, least uniformity and no crack. The results of Tafel polarization and Electrochemical
Impedance Spectroscopy tests were also consistent with the microscopic images and showed that the
coating formed in the bath with a concentration of 70 g/l of alumina has the highest corrosion resistance
corrosion properties of steels. In this research, Zn-Co-Al2O3 composite coating was applied on st37
steel substrate by electroplating method. The microstructure and corrosion behavior of the coating was
investigated by changing the concentration of alumina particles in the bath. Coating was done at
concentrations of 50, 60, 70, 80, 85 and 90 g/l of alumina. A scanning electron microscope (SEM) was
used to investigate the microstructure and observe the morphology. In order to evaluate the corrosion
resistance, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests were
carried out for both coated and uncoated samples in 3.5% NaCl. Microstructure analysis showed that
the best concentration of alumina for precipitation is 70 g/l, and in this concentration, coating had good
adhesion, least uniformity and no crack. The results of Tafel polarization and Electrochemical
Impedance Spectroscopy tests were also consistent with the microscopic images and showed that the
coating formed in the bath with a concentration of 70 g/l of alumina has the highest corrosion resistance
Keywords: Zn-Co-Al2O3 composite coating, concentration, corrosion, potentiodynamic polarization, electrochemical impedance spectroscopy
Type of Study: Research |
Subject:
General
Received: 2025/08/11 | Accepted: 2025/03/15 | Published: 2025/03/15
Received: 2025/08/11 | Accepted: 2025/03/15 | Published: 2025/03/15
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