Evaluation of corrosion and protection of coated metals with local ion concentration technique (LICT)

Maile, Frank J.; Schauer, T.; Eisenbach, Claus D.

doi:10.1016/s0300-9440(00)00080-1

Cited by 20 publications

(7 citation statements)

References 24 publications

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“…By using pH indicator paper it could be proven that the solution in the centre of the drop was acid. This was also found by Maile et al [4] who measured the local pH in an Evans drop applying the local ion concentration technique. The geometry of the droplets changed in time.…”

Section: Resultssupporting

confidence: 77%

Local potentials under electrolyte droplets on steel

Meijers¹,

Lauterbach

Wit

et al. 2000

Steel Research

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The scanning Kelvin probe shows great potential for the study of localised corrosion phenomena on coated metals. However, it still is difficult to unravel the contributions of the different components of complex coating systems to the measured Volta potentials. Experiments on simple model systems are necessary to increase our knowledge. The classical Evans drop experiment was chosen as such a model system. Using the scanning Kelvin probe potential distributions in the drop were measured. It was found that within the droplet no separate anode and cathode can be distinguished in the potential profile. A cathodic region was found just outside the droplet, where a very thin electrolyte layer exists. Twin drop experiments however showed potential differences in electrolyte over short distances.

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Section: Resultssupporting

confidence: 77%

Local potentials under electrolyte droplets on steel

Meijers¹,

Lauterbach

Wit

et al. 2000

Steel Research

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“…Coated AA2024 plates were immersed in a 5% NaCl solution in order to accelerate corrosion and verify if the coatings were able to detect the associated local change of pH [9,10]. A coated sample containing SiNC-PhPh (3%) was compared with a coated sample prepared with directly dispersed PhPh with an amount corresponding to the active compound encapsulated in the nanocontainers (0.3%) [12].…”

Section: Corrosion Sensing Testsmentioning

confidence: 99%

“…An early simpler technology [7] to obtain coatings equipped with intrinsic corrosion sensing ability was the direct dispersion of pH sensors in coating formulations [8]. The rationale behind this strategy is that once corrosion ensues, this leads to localized effects in metals [9] with an acidic pH in anodic regions and an alkaline pH in cathodic regions [10]. However, in the case of corrosion inhibitors, the direct interaction between the inhibitors and coating formulations, despite enhancing active corrosion protection, could deteriorate the coatings barrier properties, which leads to the proliferation of corrosion processes [11].…”

Section: Introductionmentioning

confidence: 99%

Improving the functionality and performance of AA2024 corrosion sensing coatings with nanocontainers

Galvão

Sousa

Wilhelm

et al. 2018

Chemical Engineering Journal

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The compatibility between nanocontainers and coating formulations is perhaps the last frontier in the quest for functional coatings. Sensing coatings for early metallic corrosion detection is an urgently needed technology by aeronautical companies to mitigate the costs of corrosion through continuous monitoring. In this work, we revisit phenolphthalein encapsulated silica nanocapsules, which were incorporated into a water-based lacquer, resulting in a novel corrosion sensing coating for aluminum alloy 2024 with improved functionality and standard performance. The ability of the coatings to detect corrosion by color change was investigated by immersion and salt-spray tests. During these tests, it was clearly demonstrated that encapsulation of the active compound is essential to obtain a functional coating, since the shell of the silica nanocapsules minimizes the detrimental interaction of the active compound with the coating formulation. The compatibility between nanostructured additives and coatings is almost never taken into consideration in the literature. Herein this aspect evidences the positive effects of active agent encapsulation, which is explored in terms of reactivity, viscoelastic properties, curing, thermal stability, release and leaching studies, hardness, mechanical properties and corrosion resistance. Computer simulations based on the density functional theory and periodic structural models were performed to unveil the interaction mode of phenolphthalein with the metallic surface.

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“…The self‐healing coating doped with corrosion inhibitor‐loaded nanocontainers allows a fast self‐healing process and has remarkable corrosion resistance. The inhibitor‐loaded nanocontainers respond to the environmental pH changes caused by initiation of the electrochemical corrosion process, releasing the inhibitor quickly to corrosion areas thus suppressing corrosion and restoring coating functionality in the scratched area. In addition to fracture of nanocontainers, pH‐response of the nanocontainers is the main factor to release the inhibitor onto the metal surface to form a dense nanobarrier.…”

Section: Methodsmentioning

confidence: 99%

Monodisperse Polymeric Core–Shell Nanocontainers for Organic Self‐Healing Anticorrosion Coatings

Schenderlein

Men

et al. 2013

Adv Materials Inter

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The highly efficient “one‐pot” synthesis of corrosion inhibitor‐loaded polymeric core–shell nanocontainers is reported for self‐healing organic anticorrosion coatings. In addition to well‐defined morphology, narrow size distribution, stimuli‐responsive release, low‐cost, and scalable fabrication, the polymeric nanocontainers also show high dispersibility in aqueous solution for water‐borne processing and excellent compatibility with the organic coating matrix for self‐healing anticorrosion protection without any external energy input.

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Evaluation of corrosion and protection of coated metals with local ion concentration technique (LICT)

Cited by 20 publications

References 24 publications

Local potentials under electrolyte droplets on steel

Local potentials under electrolyte droplets on steel

Improving the functionality and performance of AA2024 corrosion sensing coatings with nanocontainers

Monodisperse Polymeric Core–Shell Nanocontainers for Organic Self‐Healing Anticorrosion Coatings

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