Advanced Ceramics Progress

Advanced Ceramics Progress

Effect of pH of the Electroless Bath on Microstructure and Corrosion Behavior of Ni-Co-La2O3-CeO2 Coating

Document Type : Original Research Article

Authors
Katayoon Soleimani Roodi 1
Hadi Ebrahimifar 2
Farhad Mohsenifar 3
1 MSc Candidate, Department of Materials Engineering and Metallurgy, Faculty of Engineering, Shahid Bahonar University, of Kerman, Kerman, Iran.
2 Associate Professor, Department of Materials Engineering, Faculty of Mechanical and Materials Engineering, Graduate University of Advanced Technology, Kerman, Iran.
3 Assistant Professor, Mechanical Engineering Department, Faculty of Engineering, Higher Education Complex of Bam, Bam, Kerman, Iran.
10.30501/acp.2024.478445.1163
Abstract
In this study, Ni-Co-La₂O₃-CeO₂ composite coatings were deposited on an AISI 430 steel substrate using the electroless method. The microstructure and corrosion behavior of coatings obtained at different bath pHs (8, 8.5, 9, 9.5, and 10) were investigated. Coating characterization was performed using a scanning electron microscope (SEM). To assess corrosion resistance, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests were conducted in a 3.5% NaCl aqueous solution. Microstructural examination showed that the coating formed at pH 9 has greater uniformity than the other coatings. Additionally, under this condition, the highest weight percentage of reactive elements (La and Ce) was present in the coating. The Tafel polarization test results demonstrated that applying the composite coating significantly reduces the corrosion current density of the uncoated sample. The positive effect of the coating on increasing the corrosion resistance of the steel is particularly significant for the coating formed at pH 9. In this case, the corrosion current density was reduced by more than 20 times (from 17.35 µA·cm⁻² to 0.8 µA·cm⁻²) compared to the uncoated sample. The results obtained from electrochemical impedance spectroscopy (EIS) further support these findings. According to the EIS data, the charge transfer resistance for the uncoated sample was 4089 Ω·cm², while applying coatings at pH levels of 8, 8.5, 9, 9.5, and 10 increased the charge transfer resistance to 13,214, 19,840, 28,318, 17,060, and 9446 Ω·cm², respectively.
Keywords
Corrosion Resistance
Composite Coating
Potentiodynamic Polarization
Electrochemical Impedance Spectroscopy

Subjects

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  • Receive Date 14 September 2024
  • Revise Date 09 October 2024
  • Accept Date 12 November 2024