Zinc-rich primers—Test performance and electrochemical properties

Knudsen., Ole; Steinsmo, Unni; Bjordal, Marit

doi:10.1016/j.porgcoat.2005.06.009

Cited by 96 publications

(54 citation statements)

References 3 publications

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“…Corrosion protection performance of hitherto extensively investigated liquid ZRPs [1,2] is limited by the electrical and electrolytic conductivity of the primer coatings [3,4]. The former is connected to the electrical percolation phenomena relating to the pigment volume concentration (PVC) and the latter is affected by the porosity of the coatings.…”

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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“…Various salt spray tests have long been used for assessing organic coatings, but there is persistent dissatisfaction with the correlation between such tests and the performance in more benign field applications [2,3]. More recently, sensitive electrochemical methods have been shown to allow coating system performance to be assessed in environments that mimic service or in actual service itself.…”

Section: Introductionmentioning

confidence: 99%

A study of performance of corrosion prevention compounds on AA2024-T3 with electrochemical impedance spectroscopy

Gui

Kelly

2006

Electrochimica Acta

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“…It is well established that the duration of cathodic protection on the substrate can be measured via the corrosion potential. The open circuit potentials (OCPs), which in an ideal case is identical to Ecorr for the coatings, of the primer were measured against standard calomel electrode (SCE) Figure 5 (a) Bode plots for coated substrate before immersion test (evaluated in 3.5 per cent NaCl solution); (b) Bode plots for coated substrate after immersion test (evaluated in 3.5 per cent NaCl solution) (Knudsen et al, 2005). The OCP of the uncoated steel substrate was observed to be Ϫ713.95 mV.…”

Section: Anticorrosive Propertiesmentioning

confidence: 99%

Investigation of novel tri-functional epoxy resin derived from cardanol as partial replacement of BPA based epoxy in zinc rich primer

Kathalewar

Sabnis

Waghoo

2014

PRT

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Purpose -The purpose of this paper is to explore the application of triglycidyl resin (TGC) prepared from cardanol as partial replacement of conventional bis-phenol A (BPA) based epoxy resin for zinc rich primers (ZRPs). Design/methodology/approach -The synthesis of new platform chemicals that are based on renewable resources has been accepted as a strategy to contribute to sustainable development due to the anticipated depletion of fossil oil reserves and rising oil prices. We prepared a tri-functional epoxy resin from cardanol which can be used as partial replacement of BPA based epoxy. The ZRPs were prepared using 50:50 ratio of TGC:BPA epoxy, and the coatings were evaluated for mechanical, chemical and anticorrosive properties. Findings -The 50 per cent replacement of BPA based epoxy by TGC resulted in at par mechanical, chemical and anticorrosive properties as evaluated by various methods. The successful implementation can thus contribute to sustainable development by "green chemistry" route. Research limitations/implications -The prepared TGC resin in the current work was studied for application in ZRPs. This can also be explored for high performance coatings, adhesives and other engineering applications. Practical implications -The TGC binder was prepared by simple two-step reaction. This can successfully be used as binder for coating application without any modifications. Originality/value -A novel approach of using green and ecofriendly TGC resin as replacement of high cost BPA based epoxy was explored and can be implemented for numerous applications.

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Zinc-rich primers—Test performance and electrochemical properties

Cited by 96 publications

References 3 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

A study of performance of corrosion prevention compounds on AA2024-T3 with electrochemical impedance spectroscopy

Investigation of novel tri-functional epoxy resin derived from cardanol as partial replacement of BPA based epoxy in zinc rich primer

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