Corrosion protection of mild steel by electroactive polyaniline coatings

Li, P; Tan, T.C.; Lee, J.Y

doi:10.1016/s0379-6779(97)03860-5

Cited by 239 publications

(75 citation statements)

References 15 publications

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“…However, the organic packaging is not impermeable, widespread defects will create much small pathways for the corrosive species such as O 2 and H 2 O to reach packaged products, and localized corrosion will occur. 10,11) EDS analysis shows that Cl signal is existent in the spectrum of the rust on iron coupon exposed in salt spray (Fig. 5(a)), while it disappears in the spectrum of the rust on iron coupons packed with LLDPE and CL-15 bags (Fig.…”

Section: Salt Spray Testmentioning

confidence: 99%

Preparation and Characterization of a Novel Anticorrosion Material: Cu/LLDPE Nanocomposites

2011

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A novel anticorrosion material, copper/linear low density polyethylene (Cu/LLDPE) nanocomposites, was prepared via melt-blend technique. X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive spectrometer (EDS), salt spray test, thermogravimetric analysis (TG), mechanical properties test and bactericidal properties test were employed to character the resultant nanocomposites. The results of XRD and SEM showed that the nanocomposites were a hybrid of the polymer and the copper nanoparticles, and the copper nanoparticles were distributed uniformly in general. The results of salt spay test showed that nano-Cu in LLDPE could react with permeated oxygen, leading to the improvement of anticorrosion properties of the Cu/LLDPE nanocomposites. The results of mechanical properties test and TG analysis indicated that the presence of a small amount of nano-Cu (no more than 5 mass%) could enhance the mechanical properties and thermal stability of the nanocomposites and excessive nano-Cu would cause performance degradation. The bactericidal properties evaluation showed that the bactericidal ability of the Cu/LLDPE nanocomposites increased with nano-Cu content remarkably.

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Section: Salt Spray Testmentioning

confidence: 99%

Preparation and Characterization of a Novel Anticorrosion Material: Cu/LLDPE Nanocomposites

2011

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“…Their advantages include high electrical conductivity, low cost, and possibility of reducing environmental pollution [8,9]. Redox and catalytic activity of these materials promote formation of an oxyhydroxide layer on the polymer-metal interface [10][11][12], which passivates the metal surface and prevents it from corrosion; on the other hand, it causes instability of the electrical characteristics of the contact between the polymeric and metal phases [13]. Currently, the research in the field was mainly focused on the electrochemical investigations of the corrosion processes [14][15][16][17][18], but the oxide layer composition was not determined because of difficulties in applying ex situ experimental techniques [19,20].…”

Section: Introductionmentioning

confidence: 99%

Interaction of Polyaniline with Surface of Carbon Steel

Sokolova

Смирнов

Kasatkin

et al. 2017

International Journal of Polymer Science

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The structure and barrier properties of the oxyhydroxide layers on a carbon steel surface covered with electroactive polyaniline were investigated. Two types of polymer structure differing in degree of macromolecular order were prepared by simultaneous (fast polymerization) or dropwise (slow polymerization) mixing of reagents. A larger amount of the most stable FeOOH modification was formed on steel covered with slowly polymerized sample during treatment in the corrosion-active medium. Amorphous rust products with weak barrier properties were observed in the sample prepared by fast polymerization. Additionally, barrier activity of dedoped polyaniline was studied with SEM, WAXD, and electrochemical methods.

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“…Pigments can be added to organic coatings in order to improve their protection capabilities. The pigments might protect by physicochemical (barrier mechanism), electrochemical, or ion-exchange mechanism [4]. Anticorrosive primers are generally applied directly on metal substrate to protect against corrosion as a second line of defense.…”

Section: Introductionmentioning

confidence: 99%

Chemical Degradation of Epoxy-Polyamide Primer by Electrochemical Impedance Spectroscopy

2012

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The degradation of organic-inorganic hybrid materials based on epoxy resin was characterized electrochemically in aggressive chemical electrolyte. In the present study, the hybrid material as primer was prepared from epoxy resin pigmented by zinc phosphate cured with polyamide (EPZ). The hybrid material was coated on mild steel substrate, and the corrosion behavior was studied by electrode-potential time measurements and mainly by electrochemical impedance spectroscopy (EIS) in 5% NaCl solution. The impedance parameters, namely, coating capacitance (C c ), pore resistance (R po ), charge transfer resistance (R t ), double layer capacitance (C d1 ), and break point frequency ( f b ), corresponding to 45• phase angle as a function of time of exposure were estimated. The observed impedance behavior were compared with the established equivalent electrical circuit represents the coated metal/electrolyte interface. Changes in the values of the circuit components given the information on the stages of degradation and physical phenomenon occurring throughout the degradation of primer coating were also been predicted. In addition, information related to the porous nature of the primer, limited passivation effect, and delamination of coating with longer exposure that resulted in the diffusion controlled corrosion of metal are also recognized. Thus, results indicate that the EPZ coating had good corrosion resistance. This could be a nonpolluting alternative to the traditional chromate like environmentally harmful coatings.

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Corrosion protection of mild steel by electroactive polyaniline coatings

Cited by 239 publications

References 15 publications

Preparation and Characterization of a Novel Anticorrosion Material: Cu/LLDPE Nanocomposites

Preparation and Characterization of a Novel Anticorrosion Material: Cu/LLDPE Nanocomposites

Interaction of Polyaniline with Surface of Carbon Steel

Chemical Degradation of Epoxy-Polyamide Primer by Electrochemical Impedance Spectroscopy

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