Phosphate-doped polyaniline/Al2O3 nanocomposite coating for protection of stainless steel

Purpose This work aims to prepare and characterize of protective anticorrosion phosphate-doped polyaniline (PANI) nanocomposite coatings for stainless steel (SS) in chloride solution. Design/methodology/approach PANI composite coatings were electrodeposited from aqueous sulfuric acid solution contai...

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Bibliographic Details
Published in:Anti-corrosion methods and materials 2020-09, Vol.67 (5), p.491-499
Main Authors: Hermas, Abou-Elhagag A, Wahdan, Mostafa H, Ahmed, Eatemad M
Format: Article
Language:English
Subjects:
Ageing
Aging (metallurgy)
Aluminum oxide
Analytical methods
Anions
Anodic polarization
Anodic protection
Aqueous solutions
Chlorides
Coated electrodes
Coatings
Composite materials
Corrosion potential
Corrosion prevention
Corrosion resistance
Electrochemical impedance spectroscopy
Electrochemistry
Electrodes
Electrolytes
Electron microscopy
Fourier transforms
Infrared spectroscopy
Nanocomposites
Nanoparticles
Phosphates
Polyanilines
Polymer films
Polymerization
Polymers
Protection
Protective coatings
Spectrum analysis
Stainless steel
Stainless steels
Sulfuric acid
Sulphuric acid
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Summary:Purpose This work aims to prepare and characterize of protective anticorrosion phosphate-doped polyaniline (PANI) nanocomposite coatings for stainless steel (SS) in chloride solution. Design/methodology/approach PANI composite coatings were electrodeposited from aqueous sulfuric acid solution containing monomer and Al2O3 nanoparticles using cyclic voltammetry technique. Doping by phosphate was done by aging the coated steels for different periods (1–168 h) in phosphate solution. The polymer film composite was investigated by Fourier-transform infrared spectroscopy and scanning electron microscopy techniques. Potential-time, anodic polarization and electrochemical impedance spectroscopy were used to study the protection efficiency of the coatings. Findings The Al2O3 nanoparticles were incorporated into the deposited PANI layer but they decreased the deposition of polymer. The nanoparticles and the phosphate anions enhanced the protective PANI layer for passivation and protection of SS in the chloride solution. Originality/value The replacement of counter anions by phosphate ions improved significantly the PANI and its nanocomposite as protective coating of SS in chloride solution.
ISSN:0003-5599
1758-4221
DOI:10.1108/ACMM-05-2020-2305