Electrochemical and anticorrosion performances of zinc-rich and polyaniline powder coatings

Meroufel, Abdelkader; Deslouis, C.; Touzain, S.

doi:10.1016/j.electacta.2007.09.056

Cited by 125 publications

(61 citation statements)

References 34 publications

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“…Combination of the ICPs with sacrificial metallic grains is to retain galvanic function and reduce electrolytic conductivity of the ZRPs in the form of using stand-alone ICPs [9] or composited primers [10]. To amend inefficient mechanical blockage of conventional ZRPs [11] and to improve zinc-rich powder coatings [12], intrinsically conducting polymers (ICPs) have been successfully used as mild inhibitor agents to advance corrosion resistance of hybrid paints over ICP-free coatings. Further development was achieved by physical mixture of organic particles and inorganic pigments, but the idea to attain valuable improvement of galvanic protecting organic coatings relies on the formulation of hybrid paints containing highly dispersed particle supported ICPs along with the active anodic metallic pigments.…”

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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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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“…[1][2][3][4] Now, PANI has been widely studied for potential applications in many domains such as electrochromic devices, rechargeable batteries, electromagnetic interference shielding, and sensors. 5,6 Since the time Deberry 7 found the protective effect of PANI on iron-based metal, the anticorrosion application of PANI has attracted enormous interest among researchers.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of polyaniline nanofiber and anticorrosion property of polyaniline–epoxy composite coating for Q235 steel

Yang

Hou

2011

J Coat Technol Res

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Polyaniline (PANI) nanofibers were prepared by direct mixed oxidation in four kinds of inorganic acids. The characterization of scanning electron microscopy (SEM) showed that high quality PANI fibers with uniform diameter and several microns length can be obtained by direct mixed oxidation, especially in a sulfuric acid system. Structural characteristics of PANI products through IR and UV spectra indicated the consistent peak distribution with the classic spectrum of the doped PANI. In addition, composite coatings of PANI-epoxy resin were prepared by mechanical grinding. The effect of PANI's content on anticorrosion property of the composite coatings for Q235 steel was studied by the electrochemical impedance spectroscopy (EIS). Results showed that the best shielding protective effect was obtained when the amount of PANI was around 0.5% (wt%). More importantly, the effects of four different inorganic acids on anticorrosion property of the composite coatings were studied by the EIS and Tafel polarization curve. Experiments showed that the different composite coatings of PANI doped by different inorganic acids provided different protective abilities for the Q235 steel. It can be concluded that both the morphology and counteranion would impact the anticorrosion effect of the doped PANI.

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“…Addition of metallic fillers converts the non-conductive epoxy formulation into an electrically conductive system where a certain content of fillers must be reached, offering an electrical contact between particles themselves and the metallic substrate, i.e. percolation [4][5][6]. Organic sealants containing metallic particles, fibres, flakes or other fillers such as graphite, or carbon black are widely used in electronics, automotive and aerospace manufacture, antistatic packaging and coatings [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Organic sealants containing metallic particles, fibres, flakes or other fillers such as graphite, or carbon black are widely used in electronics, automotive and aerospace manufacture, antistatic packaging and coatings [7,8]. In studies concerning conductive and protective paints, zinc-rich powder coatings on steel substrates are investigated widely and deeply, which corrode from the surface to the coating/steel substrate interface, allowing first a cathodic protection and then barrier isolation [4][5][6]. Pedro de Lima-Neto et al employed various pigments like zinc phosphate (ZP), zinc phosphomolybdate (ZPM) and zinc calcium phosphomolybdate (ZCPM) into epoxy binders as non-toxic inorganic corrosion inhibitors.…”

Section: Introductionmentioning

confidence: 99%

Corrosion resistant performances of Al‐rich epoxy resin based paint on arc‐sprayed Al coating

Wang

Liu

2010

Materials & Corrosion

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Electrical conductive Al-rich epoxy resin based paint with an acceptable surface was for the first time prepared on an arc-sprayed aluminium coating surface successfully. Adhesion test and salt solution immersion test (SSIT) with complementary measurements including electron probe microanalysis (EPMA) and Raman spectroscopy were employed. Adhesion properties of the epoxy resin pigmented with Al particles did not degrade. Besides, because of the close Al particle-resin integration and the tight adhesion in the paint-coating interface, the strong adherence of corrosion products on Al particles, as well as probable passivation of Al particles, the paint showed no worse corrosion resistance properties than the epoxy resin and corroded at a similar rate to the epoxy resin, uniformly, slowly and slightly, protecting the coating base as a barrier type film.

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Electrochemical and anticorrosion performances of zinc-rich and polyaniline powder coatings

Cited by 125 publications

References 34 publications

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

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

Synthesis of polyaniline nanofiber and anticorrosion property of polyaniline–epoxy composite coating for Q235 steel

Corrosion resistant performances of Al‐rich epoxy resin based paint on arc‐sprayed Al coating

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