Nanocomposite of polypyrrole and alumina nanoparticles as a coating filler for the corrosion protection of aluminium alloy 2024-T3

Tallman, Dennis E.; Levine, Kirill L.; Siripirom, Chavanin; Gelling, Victoria G.; Bierwagen, Gordon P.; Croll, Stuart

doi:10.1016/j.apsusc.2008.02.099

Cited by 65 publications

(26 citation statements)

References 17 publications

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“…As a lateral result, number of preferred locations for nucleation of coating will be increased and therefore microstructure of coating becomes finer. On the other hand, according to beneficial role of embedded Alumina nanoparticles in improving corrosion resistance of various coating such as polymer coating [15] due to prevention of diffusion of aggressive ions from solution, plasma spray coating [16] due to reduced growth rate of TGO and thus reduced infiltration of corrosive agents such as oxygen and ions through TBC, here use of…”

Section: Introductionmentioning

confidence: 99%

Wettability and corrosion of alumina embedded nanocomposite MAO coating on nanocrystalline AZ31B magnesium alloy

Gheytani

Mahmood

Bagheri

et al. 2015

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Wettability and corrosion of alumina embedded nanocomposite MAO coating on nanocrystalline AZ31B magnesium alloy

Gheytani

Mahmood

Bagheri

et al. 2015

Journal of Alloys and Compounds

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“…Although PPy deposited nano-size alumina was solely utilized in composite coatings to protect directly aluminium from corrosion [26], whereas the effects of various types of PPy modified alumina has been studied recently [27], the influence of altered ratio of the inhibitor particles and the sacrificial zinc pigments on the corrosion resistivity of particular hybrid formulations has not yet been disclosed. In an effort to achieve firm and durable corrosion prevention performance at the same time, this work is devoted to investigate various hybrid formulations in order to gain valuable improvement by certain zincrich compositions.…”

Section: Introductionmentioning

confidence: 99%

Corrosion protection with zinc-rich epoxy paint coatings embedded with various amounts of highly dispersed polypyrrole-deposited alumina monohydrate particles

Gergely

Bertóti

Törók

et al. 2013

Progress in Organic Coatings

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Active anodic zinc content below 90 wt.% does not support sufficient electrical contacts but higher contents cause high porosity of traditional liquid zinc-rich paints (ZRPs). To resolve this problem, our proposal is the application of highly dispersed polypyrrole (PPy) coated alumina inhibitor particles (PCAIPs) in zinc-rich paint compositions. Using these nano-size inhibitor particles at concentrations from 4.55 to 0.85 wt.%, hybrid paints were formulated with zinc contents ranging from 60 to 85 wt.% at the same time. Submicron morphology and nano-scale structure, spectroscopy characteristics and electrochemical properties of the PCAIPs were studied by transmission electron microscopy (TEM) and rheology, Fourier-transform infrared spectroscopy (FT-IR) and cyclic voltammetry (CV) in first part of the work. In the second part, electrolytic corrosion resistivity of two sets of paint coatings were salt-spray chamber and immersion tested with 5 wt.% aqueous solution of sodium chloride. Active corrosion prevention ability of the saltspray tested coatings was evaluated in compliance with ISO recommendations. Dielectric properties of the coatings during the immersion tests were monitored by electrochemical impedance spectroscopy (EIS). Corrosion tested area of the coatings was investigated by glowdischarge optical emission spectroscopy (GD-OES) to disclose infiltration of corrosive analytes and oxygen enrichment in the cross-section of the primers in comparison with their pristine states. Morphology of the zinc pigments was examined by scanning electron microscopy (SEM), and quality of steel specimens and the interfacial binder residues by X-ray photoelectron spectroscopy (XPS) as well as FT-Raman and Mössbauer spectroscopy. The results of both types of corrosion tests evidenced efficient utilisation of sacrificial anodic current for galvanic protection and improved barrier profile of the hybrid coatings, along with the PCAIP inhibited moderate selfcorrosion of zinc. As a result of well balanced active/passive function, the hybrid coating 2 containing zinc at 80 wt.% and PCAIPs at 1.75 wt.% embedding PPy at 0.056 wt.% indicated the most advanced corrosion prevention. Galvanic function of the hybrid paints is interpreted on the basis of size-range effect and spatial distribution of the alumina supported PPy inhibitor particles and basic electrical percolation model considerations.

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“…Oxygen reduction at CPs surface causes replenishing of the depleted charge. [86][87][88] As mentioned earlier, this reduction of oxygen leads to the oxygen scavenging by CPs resulting in reduced corrosion rates. The replenishment of the charge also results in the stabilization of the potential in the passive region on the metal surface.…”

Section: Galvanic Coupling Measurementsmentioning

confidence: 94%

Tungstate and vanadate-doped polypyrrole/aluminum flake composite coatings for the corrosion protection of aluminum 2024-T3

2015

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Polypyrrole (PPy) doped with either tungstate or vanadate as counter anions was synthesized by chemical oxidative polymerization on the surface of aluminum (Al) flakes. This resulted in the deposition of PPy on the surface of the Al flakes leading to the formation of doped PPy/Al flake composite pigments. These composite pigments were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, conductive-atomic force microscopy, four-point probe conductivity, and X-ray photoelectron spectroscopy. Furthermore, these composites were incorporated in an epoxy-amide binder system in order to formulate a primer for an aluminum 2024-T3 substrate. The coatings were exposed to the Prohesion test conditions and corrosion resistance properties were monitored by electrochemical impedance spectroscopy, DC polarization, galvanic coupling, and scanning electrochemical microscopy measurements. It was found that the doped PPy/Al flake coatings provided sacrificial protection to the underlying aluminum 2024-T3 substrate. Additionally, the release of dopants from PPy backbone resulted in the passivation in the defect areas improving the corrosion protection ability.

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Nanocomposite of polypyrrole and alumina nanoparticles as a coating filler for the corrosion protection of aluminium alloy 2024-T3

Cited by 65 publications

References 17 publications

Wettability and corrosion of alumina embedded nanocomposite MAO coating on nanocrystalline AZ31B magnesium alloy

Wettability and corrosion of alumina embedded nanocomposite MAO coating on nanocrystalline AZ31B magnesium alloy

Corrosion protection with zinc-rich epoxy paint coatings embedded with various amounts of highly dispersed polypyrrole-deposited alumina monohydrate particles

Tungstate and vanadate-doped polypyrrole/aluminum flake composite coatings for the corrosion protection of aluminum 2024-T3

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