Fabrication on designing of a macromolecular epoxy resin as anti-corrosive coating material for electrocatalytically deposited cadmium on 15CDV6 steel in 3% NaCl solution

O. Dagdag; A. El Harfi; Zaki Safi; Lei Guo; Chandrabhan Verma; E.E. Ebenso; Nuha Wazzan; M. El Gouri

Journal of Materials Research and Technology (May 2020)

Fabrication on designing of a macromolecular epoxy resin as anti-corrosive coating material for electrocatalytically deposited cadmium on 15CDV6 steel in 3% NaCl solution

O. Dagdag,
A. El Harfi,
Zaki Safi,
Lei Guo,
Chandrabhan Verma,
E.E. Ebenso,
Nuha Wazzan,
M. El Gouri

Affiliations

O. Dagdag: Laboratory of Industrial Technologies and Services (EMEL), Department of Process Engineering, Height School of Technology, Sidi Mohammed Ben Abdallah University, P.O. Box 2427, 30000 Fez, Morocco
A. El Harfi: Laboratory of Agroresources, Polymers and Process Engineering (LAPPE), Department of Chemistry, Faculty of Science, Ibn Tofail University, BP 133, 14000 Kenitra, Morocco
Zaki Safi: Al Azhar University-Gaza, Chemistry Department, Faculty of Science, P.O Box 1277, Gaza, Palestine
Lei Guo: School of Materials and Chemical Engineering, Tongren University, Tongren 554300, China
Chandrabhan Verma: Center of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia; Department of Chemistry, School of Chemical and Physical Sciences, Faculty of Natural and Agricultural Sciences, North-West University, Private Bag X2046, Mmabatho 2735, South Africa; Material Science Innovation & Modelling (MaSIM) Research Focus Area, Faculty of Natural and Agricultural Sciences, North-West University, Private Bag X2046, Mmabatho 2735, South Africa; Corresponding author.
E.E. Ebenso: Department of Chemistry, School of Chemical and Physical Sciences, Faculty of Natural and Agricultural Sciences, North-West University, Private Bag X2046, Mmabatho 2735, South Africa; Material Science Innovation & Modelling (MaSIM) Research Focus Area, Faculty of Natural and Agricultural Sciences, North-West University, Private Bag X2046, Mmabatho 2735, South Africa
Nuha Wazzan: King Abdulaziz University, Chemistry Department, Faculty of Science, P.O Box 42805, Jeddah 21589, Saudi Arabia
M. El Gouri: Laboratory of Industrial Technologies and Services (EMEL), Department of Process Engineering, Height School of Technology, Sidi Mohammed Ben Abdallah University, P.O. Box 2427, 30000 Fez, Morocco

Journal volume & issue: Vol. 9, no. 3
pp. 5549 – 5563

Abstract

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Present study deliberates for the surface treatment of15CDV6 steel using electrolytic cadmium and its corrosion resistance behavior by a macromolecular epoxy coating (DGEBA-DAA) using computational and experimental techniques. Electrochemical results demonstrated that presence of the cadmium enhances the interfacial adhesion behavior of the DGEBA-DAA and same conclusion was reinforced through the computational studies carried out by means of density functional theory (DFT) and molecular dynamic (MD) simulations methods. EIS studies conducted at several time intervals varying from 1 h to 180 days showed that increase in immersion time results into the corresponding decrease in the corrosion resistance behavior of DGEBA-DAA coating as significant decrease in the values of charge transfer resistance (Rct) and polarization resistance (Rp) were observed on increasing the immersion time. DGEBA-DAA coating showed the highest Rct and Rp values of 6.61 kΩ cm2 and 13.52 kΩ cm2, respectively after 1 h immersion time whereas the lowest Rct and Rp values of 1.07 kΩ cm2 and 1.80 kΩ cm2 were obsrved after 180 days immersion . Scanning electron microscopy (SEM) analysis coupled with energy dispersive spectroscopy (EDS) showed that increase in the immersion of 15CDV6 steel in electrolyte decreases the corrosion resistance of the DGEBA-DAA coating through the development, deepening and broadening of the micro-pores. DFT study indicated that DGEBA-DAA interacts through charge transfer (donor–acceptor) interactions in which polar functional groups act as sites for the interactions (adsorption). Outcomes of MD simulations studies depicted that DGEBA-DAA, adsorbed on the cadmium (Cd) surface using its flat or nearly flat orientation thereby acts as effective anti-corrosive coating material. Results of EIS, SEM-EDS, DFT and MDS analyses were in good agreement.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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