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Effect of glycine as a complex agent on the surface and corrosion properties of Ni-P and Ni-P/Al2O3 electroless coating

Refaie Omar (Department of Mining and Metallurgical Engineering, Faculty of Engineering, Assiut University, Assiut, Egypt)
Elsayed Oraby (Department of Mining Engineering and Metallurgical Engineering, Curtin University, Perth, Australia)
Yasser Abdelrhman (Department of Mechanical Engineering, Faculty of Engineering, Assiut University, Assiut, Egypt)
Mohammed Aboraia (Faculty of Engineering, Assiut University, Assiut, Egypt)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 10 November 2020

Issue publication date: 4 December 2020

184

Abstract

Purpose

The ability to produce a uniform composition, high corrosion resistance with a hard coating layer during the electroless coating techniques are mainly based on the plating bath composition. The complexing agent is one of the most important components that control the coating layer properties. This paper aims to investigate the effect of the glycine as a complex agent on the surface and corrosion properties of Ni-P and Ni-P/Al2O3 electroless coating.

Design/methodology/approach

In this study, the effect of glycine as a complexing agent on the final surface and corrosion properties of the Ni-P and Ni-P/Al2O3 coatings has been investigated. The surface morphology and composition of the coated samples were investigated by scanning electron microscope (SEM) imaging and energy dispersive x-ray spectroscopy (EDS) analysis. Linear polarization scan and electrochemical impedance spectroscopy techniques were used to investigate the corrosion properties of the coating layer.

Findings

The results clarify that, glycine has a remarkable effect on the porosity content of Ni-P and Ni-P/Al2O3. It was found that increasing of glycine concentration results in higher porosity content in the coating layers. Also, the porosity in the coating layers minimizes the protectability of the coating against corrosion. The results also show that adding nano-alumina (Al2O3) to the coating path has improved the corrosion properties by decreasing the porosity in the coating layer. The scanning electron microscope (SEM) images showed that the concentration of glycine affects the content and distribution of alumina nanoparticles embedded in the coating layer. Also, it was observed that using a high concentration of glycine (0.4 M glycine), the alumina tends to agglomerate and the final alumina content in the coating was decreased.

Originality/value

The present study reveals that the quality of the final coating plays a major role in the corrosion performance of the steel substrate. The coating quality can by improve remarkably by optimization of the complexing agent used in the plating bath, to minimize the porosity involve in the coating layer.

Keywords

Citation

Omar, R., Oraby, E., Abdelrhman, Y. and Aboraia, M. (2020), "Effect of glycine as a complex agent on the surface and corrosion properties of Ni-P and Ni-P/Al2O3 electroless coating", Anti-Corrosion Methods and Materials, Vol. 67 No. 6, pp. 593-603. https://doi.org/10.1108/ACMM-06-2020-2318

Publisher

:

Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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