Chromate ion transport in epoxy films: Influence of BaSO4 particles

Kopeć, M.; Rossenaar, Brenda D.; Leerdam, Kees van; Davies, Antony N.; Lyon, S.B.; Visser, Peter; Gibbon, Simon

doi:10.1016/j.porgcoat.2020.105739

Cited by 5 publications

(8 citation statements)

References 17 publications

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“…This is because the binder adjacent to inorganic particles will be saturated with water but, like ions from the external electrolyte, ions from the internal electrolyte cannot diffuse into the binder at this early stage of immersion because the free volume of the PU is smaller than the ion sizes [30]. Similar conclusions have been reached for epoxy systems [36][37][38][39]. Two effects result from this water-uptake.…”

Section: Introductionmentioning

confidence: 55%

“…This suggests that BaSO 4 sites were becoming active in the development of the channel network development. The surface of BaSO 4 particles has previously been reported to be an active site for chromate adsorption in epoxy-based systems [38]. BaSO 4 is generally considered to be insoluble or at least sparingly soluble [61] and its role in transport network formation is interesting.…”

Section: Partial Depletion and Network Formationmentioning

confidence: 99%

See 1 more Smart Citation

Li leaching from Li carbonate-primer: Transport pathway development from the scribe edge of a primer/topcoat system

Visser

Ranade

Laird

et al. 2021

Progress in Organic Coatings

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Section: Introductionmentioning

confidence: 55%

Section: Partial Depletion and Network Formationmentioning

confidence: 99%

Li leaching from Li carbonate-primer: Transport pathway development from the scribe edge of a primer/topcoat system

Visser

Ranade

Laird

et al. 2021

Progress in Organic Coatings

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“…In the case of inert TiO 2 pigment, acceleration of chromate ions migration was via the particle/matrix interface of the network of interconnected particles. In contrast, for other type of particles (commonly used filler: BaSO 4 ) studied recently, it was shown that BaSO 4 particles were actively contributing to the migration mechanism via the ion-exchange process while slowly leaching from the film 25 . BaSO 4 particles were shown to partially dissolve and leach from the films when exposed to chromate solution, leaving the space for the connected transport pathways to be formed.…”

Section: Resultsmentioning

confidence: 88%

“…Similarly, as in our previous work 25 , free-standing films were prepared from epoxy resin Epikote 828 and hardener Ancamine 2500 (resin:hardener Composition of the film at different depths is reported up to half of its thickness (30 µm); the film was exposed from both sides, hence the maximum migration distance equals to 1/2 of the film thickness. The thickness of the film was 60 µm.…”

Section: Materials and Samples Preparationmentioning

confidence: 99%

“…Recently, we proposed an experimental approach that allowed focusing on one type of additive used in the formulation of coatings and studying its potential role in the transport of chromate ions 25 . Simplified model epoxy films with the addition of one type of particle (BaSO 4 ) were used to study the transport of chromate ions into the coating from an external solution.…”

Section: Introductionmentioning

confidence: 99%

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Influence of TiO2 pigment particles on chromate ion transport in epoxy films

Kopeć¹,

Rossenaar²,

Leerdam³

et al. 2021

npj Mater Degrad

Self Cite

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Transport of active species (i.e., ions) leaching from pigment particles incorporated in a polymer matrix is the main mechanism behind the anticorrosive performance of protective coatings. Understanding this mechanism is necessary for the effective design of the systems utilizing pigments less toxic than the most efficient chromate salts. It was demonstrated that anticorrosive pigment particles can themselves facilitate the transport of active species via the pathways formed after pigment leaching from a coating. It was also suggested that other paint components, e.g., certain additives, pigments, and fillers can be involved in the formation of transport pathways. Investigation of the possible influence of inert pigment (TiO2) on creating the pathways for chromate ion transport in polymer coatings was the primary objective of this work. In an experiment mimicking the transport of pigment species (i.e., chromate ions), a model epoxy coating containing particles of a single pigment (TiO2) was exposed to a chromate solution (aqueous, or with the addition of acetone as a polymer swelling agent). It was shown that the chromate ions can be transported in the epoxy film preferentially via the TiO2 particles/polymer matrix interface.

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Evaluating organic coating performance by EIS: Correlation between long‐term EIS measurements and corrosion of the metal substrate

Bongiorno,

Michailidou,

Curioni

2023

Materials & Corrosion

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In this study, the possibility of obtaining a corrosion indicator from a time series of electrochemical impedance spectra acquired during immersion of intact organic coatings was inspected. To generate a wide distribution in performance, coatings with different pigment volume concentrations were applied on AA2024‐T3 and cold‐rolled mild steel and tested in four different electrolytes and for different exposure times. The relative ranking of anticorrosion performance was based on the visual appearance of the metal substrates after stripping the coating and it correlated well with the estimation of the corrosion charge estimated from the time series of electrochemical impedance spectroscopy spectra.

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Chromate ion transport in epoxy films: Influence of BaSO4 particles

Cited by 5 publications

References 17 publications

Li leaching from Li carbonate-primer: Transport pathway development from the scribe edge of a primer/topcoat system

Li leaching from Li carbonate-primer: Transport pathway development from the scribe edge of a primer/topcoat system

Influence of TiO2 pigment particles on chromate ion transport in epoxy films

Evaluating organic coating performance by EIS: Correlation between long‐term EIS measurements and corrosion of the metal substrate

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