Characterization of zinc-rich powder coatings by EIS and Raman spectroscopy

Marchebois, Herve; Joiret, S.; Savall, C.; Bernard, J.; Touzain, S.

doi:10.1016/s0257-8972(02)00147-0

Cited by 138 publications

(76 citation statements)

References 11 publications

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“…The two peaks at 260 and 393 cm −1 are characteristic peaks of simonkollite. [48][49][50][51][52] Notice that the strong peak at 3460 cm −1 is characteristic of the OH − vibrations that appear at high frequencies. 48,49 In some regions in the periphery of the larger circular corroded regions (e.g., Fig.…”

Section: Resultsmentioning

confidence: 99%

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Aerosol Salt Particle Deposition on Metals Exposed to Marine Environments: A Study Related to Marine Atmospheric Corrosion

Hihara

2014

J. Electrochem. Soc.

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The characterization and corrosive effect of marine salt particles and seawater droplets that naturally deposited onto carbon steel and pure zinc that were exposed to marine test sites were studied. Most of the salt particles had diameters ranging from approximately 2-10 μm, and varied in their composition ranging from almost pure NaCl or KCl to mixtures of NaCl, KCl, CaCl 2 , and MgCl 2 . The differences in composition may depend on whether the seawater droplets dehydrate, crystallize, and fragment while airborne, or if they deposit as liquid droplets prior to crystallizing. The deposition of salt particles also decreased as the wind velocity decreased. The initial stage of marine atmospheric corrosion of the carbon steel and pure zinc induced by the salt deposition was also investigated. On the carbon steel substrate, NaCl-containing seawater droplets smaller than approximately 30 μm could not initiate corrosion even after 30 minutes of exposure; whereas, droplets larger than approximately 30 μm induced corrosion within approximately 30 minutes with lepidocrocite as the corrosion product. Corrosion initiated on the pure zinc samples under droplets of all sizes within 30 minutes. On the zinc samples, simonkollite formed in the central anodic region; whereas, hydrozincite formed in the peripheral cathodic region. Atmospheric corrosion has been extensively studied ever since W.H.J. Vernon's work in the 1920s. Its complexity is based on numerous influential parameters, including both meteorological and pollution parameters. Among these variables are the airborne sea salts in coastal regions (marine aerosols), which are generated either in the open sea or the surf zone.1-3 Marine aerosols consisting of wet aerosols, partially wet aerosols, and non-equilibrium aerosols depending on the atmosphere humidity, 4 are carried by the wind and can reach offshore structures and greatly accelerate the corrosion of metals. The sizes of the three types of aerosols and the resultant dry aerosols were estimated by Cole et al. 4 The amount of marine aerosols present in a specific marine atmosphere, known as airborne salinity, is usually measured in both atmospheric and corrosion studies. For corrosion studies, correlating marine salinity and metallic corrosion is a major focus. By compiling worldwide research on atmospheric corrosion that was conducted in the last 40 years, Morcillo et al. 5 reported that the metallic corrosion rate increases fastest with respect to chloride deposition when its values are between 100 and 400 mg Cl − /m 2 /day, and slower when the chloride deposition is less than 100 mg Cl − /m 2 /day or more than 400 mg Cl − /m 2 /day. Studies have also focused on the behavior of marine aerosols, including their production, transport and deposition. 1,6,7 Cole et al.1 proposed a comprehensive model that requires the input of significant amounts of data; whereas, Meira et al. 7 generated a simplified model that depends only on aerosol characteristics and has wind velocity and distance from the sea as independent va...

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Section: Resultsmentioning

confidence: 99%

“…13b). The peak at 568 cm −1 is attributed to zinc oxide, 48,[50][51][52][53] while the peaks at 386, 738, 1071, 1356, and 1554 cm −1 are corresponded to hydrozincite. 49,51,52,54 Peaks in the range of 2850-2950 cm −1 are possibly due to the O-H stretching in hydrozincite.…”

Section: Resultsmentioning

confidence: 99%

Aerosol Salt Particle Deposition on Metals Exposed to Marine Environments: A Study Related to Marine Atmospheric Corrosion

Hihara

2014

J. Electrochem. Soc.

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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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“…The coatings with pigments such as micaceous iron oxide or zinc with different PVCs have been studied. 4,5 Electrochemical impedance spectroscopy (EIS) is a suitable method to determine the critical pigment volume concentration (CPVC) of coatings, especially for nanocomposite coatings; CPVC of which is difficult to be determine by scanning electron microscopy (SEM) analysis. [6][7][8] The purpose of this work was to correlate the pigment particle size and PVC with the barrier properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle sizes and pigment volume concentrations on the barrier properties of polyurethane coatings

2009

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Characterization of zinc-rich powder coatings by EIS and Raman spectroscopy

Cited by 138 publications

References 11 publications

Aerosol Salt Particle Deposition on Metals Exposed to Marine Environments: A Study Related to Marine Atmospheric Corrosion

Aerosol Salt Particle Deposition on Metals Exposed to Marine Environments: A Study Related to Marine Atmospheric Corrosion

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

Effect of particle sizes and pigment volume concentrations on the barrier properties of polyurethane coatings

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