Abstract
In this work, biopolymer based sol-gel was synthesized by doping 3-mercaptopropanoic acid (MPA) with chitosan and a hybrid of 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetraethoxysilane (TEOS). Prepared MPA/hybrid-doped chitosan was applied toa copper (Cu) metal surface by the self-assembly technique to protect the Cu metal from corrosion in a 3.5% NaCl solution. The structure, mechanism and morphology of the modified electrodes were examined using Fourier transform infra-red (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDX), and atomic force microscopy (AFM). The decrease in surface roughness for Hy/chitosan/MPA-coated Cu indicates the formation of a dense layer on Cu metal confirmed by AFM. The corrosion protection evaluation of sol-gel coated electrodes was analyzed using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization studies (PDS) in a 3.5% NaCl medium. The MPA/hybrid-doped chitosan sol-gel coated Cu metal showed the greatest resistance to corrosionthanother sol-gel modified electrodes. The MPA-doped-chitosan/Hy sol-gel coating protected the Cu metal by an anodic dissolution process and improved its corrosion protection to 99.9%.
Highlights
Copper (Cu) and its alloys exhibit virtuous electrical, mechanical, and antifouling properties, corrosion resistance, excellent thermal, and electrical conductivity and play a vital role in thermal coolant systems and electronics industries [1,2,3]
Physical vapor deposition (PVD), chemical vapor deposition (CVD), plasma spraying, electrodeposition, and sol-gel coatings are the various coating strategies applied to the corrosion protection of the Cu metal [8]
The results showed an inhibition efficiency of 99.9% by using a sol-gel coating of 3-mercaptopropanoic acid (MPA), 3-glycidoxypropyltrimethoxysilane (GPTMS), and tetraethoxysilane (TEOS) hybrid chitosan biopolymer.The results show promisethat this may be extended for the Cu metal used in the environment
Summary
Copper (Cu) and its alloys exhibit virtuous electrical, mechanical, and antifouling properties, corrosion resistance, excellent thermal, and electrical conductivity and play a vital role in thermal coolant systems and electronics industries [1,2,3]. Balaji et al have studied hybrid zirconium and nanoTiO2 doped coating with water soluble chitosan biopolymer as a corrosion inhibitor to protect Al metals [15,16].
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