SECM study of steel corrosion under scratched microencapsulated epoxy resin

Pilbáth, Aranka; Szabó, Tamás; Telegdi, J.; Nyikos, Lajos

doi:10.1016/j.porgcoat.2012.06.006

Cited by 54 publications

(17 citation statements)

References 37 publications

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“…Figure 6 schematically shows how a capsule is created using the particular methods [29]. As the building material, the following are used: poly(urea-formaldehyde) (PUF) [32][33][34][35], melamine-urea-formaldehyde (MUF) [35,36], phenol-formaldehyde [37], epoxy resin [38,39], methylene diphenyl diisocyanate (MDI) [40], poly(methyl methacrylate) (PMMA) [41,42], polystyrene [32,41], poly(allylamine) [43], polyvinyl alcohol (PVA) [43,44], polyurethane [40], polyphenol, amphiphilic block copolymers (polypyrrolidones, poly(ethylene oxide) [31], poly(caprolactone)) [31,32], cerium molybdate [45], zinc and aluminium nitrate [46,47], silica [27,32,[48][49][50], silver [42], gold [51], copper(II) sulphide [51], c-AlO(OH) [51], tin(IV) oxide [51] and titania oxides [42,52,53] and CaCO 3 microbeads [54]. The capsule material and the way of preparing capsules affect their shape and size.…”

Section: Coatings Containing Micro-or Nanocapsulesmentioning

confidence: 99%

“…Halloysite nanotubes and boehmite nanoparticles are employed as reservoirs for corrosion-inhibiting compounds [57][58][59]. Cerium cations [58,[60][61][62], 8-hydroxyquinoline [48,57], benzotriazole [45,48,49,63,64], mercaptobenzimidazole (MBI) [63], dicyclopentadiene (DCPD), alkoxysilanes [65], silyl ester [24], linseed oil [37,44,66], hexamethylene diisocyanate (HDI) [40], triethanolamine (TEA) [41], monomers and catalysts for ROMP [67], magnesium ions [68], chromium(III) and cerium(IV) oxides [34] and cerium(III) chloride [60,69] are used as corrosion inhibitors. The action mechanisms connected with the particular compounds are presented in Table 1.…”

Section: Coatings Containing Micro-or Nanocapsulesmentioning

confidence: 99%

“…For this purpose, the coating is cut, immersed in a corrosive solution and the place of the cut is examined at fixed time intervals using optical microscopy, scanning electron microscope (SEM), atomic force microscopy (AFM) or scanning Kelvin probe force microscopy (SKPFM) [32,37,38,40,102,115]. The scanning electrochemical microscope (SECM) is used a tool enabling one to evaluate the self-repairing properties of coatings [44]. Using this technique, one can not only acquire microscopical data from the surface affected by corrosion but also measure local differences in electrochemical reactivity.…”

Section: Self-healing Process Investigationmentioning

confidence: 99%

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Self-healing coatings in anti-corrosion applications

2013

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Nonmetallic (based on polymers or oxides) and metallic protective coatings are used to protect metal products against the harmful action of the corrosion environment. In recent years, self-healing coatings have been the subject of increasing interest. The ability of such coatings to self-repair local damage caused by external factors is a major factor contributing to their attractiveness. Polymer layers, silica-organic layers, conversion layers, metallic layers and ceramic layers, to mention but a few, are used as self-healing coatings. This paper presents the main kinds of self-healing coatings and explains their selfhealing mechanisms.

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Section: Coatings Containing Micro-or Nanocapsulesmentioning

confidence: 99%

Section: Coatings Containing Micro-or Nanocapsulesmentioning

confidence: 99%

Section: Self-healing Process Investigationmentioning

confidence: 99%

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Self-healing coatings in anti-corrosion applications

2013

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“…The study of self-healing of steel corrosion under scratched epoxy resin with microencapsulated, linseed oil was followed by ECSEM and the corrosion inhibiting activity of coating filled with inhibitor-loaded microcapsules was successfully demonstrated (Pilbath et al, 2012).…”

Section: Scanning Electrochemical Microscope (Secm)mentioning

confidence: 99%

Micro/nanocapsules for anticorrosion coatings

Telegdi

Shaban

Vastag

2018

Fundamentals of Nanoparticles

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In the last decade, the interest in the self-healing and slow release coatings applied against corrosion increased dramatically as it helps to expand duration of coating and, at the same time, to increase the structural materials' life. In these types of paints are micro and nanoncapsules that enable the reparation of the coating upon exposure to external stimuli like mechanical degradation, changes in the pH and/or temperature. In spite of the extensive laboratory research work, there are many unsolved problems in understanding the function of smart coatings. To summarize the knowledge accumulated up-to-now in this topic will help both academic and industrial specialists to keep in center of interest for further research to solve problems that will result in development of more effective micro-and nanocontainers for different paints. Coatings with micro-and nano-containers/capsules improve the basic coating characteristics like anticorrosion efficiency. The chapter first discusses the importance of self-healing and slow release phenomena, and then it focuses on the basic knowledge of micro-and nano-capsule preparation techniques as well as on the importance of "filled" capsules. Advances on preparation of different types of the containers (organic, inorganic, and multilayer) are reviewed. Then the shell and wall materials, the wall thickness and its mechanical properties is discussed as one of the most important questions. One must keep in mind that the capsules must remain intact for years during storage, coating formulation and application and, additionally, in the dry coating.Experimental techniques used for characterization of micro/nanocapsules (size, size distribution, mechanical stability etc.) are discussed. Corrosion is a serious problem all over the world. The cost of corrosion includes materials for reparation of corrosion damage, the reduced capacity of equipment and the manpower to repair it increases. The corrosion problems could be solved by protective layers that ensure the integrity of the metal. However, even the best protective coatings can allow the diffusion of oxygen, the admittance of aggressive chemicals and moisture to the metal surface; the coating could delaminate from the solid surface and, as a consequence, the dissolution of metal starts. The first signs of the corrosive attack are cracks and pits formed on the solid surface. The problem could be solved or mitigated by coatings that are tailored for protection against corrosion and any other undesired external interaction. They ensure a long-term performance of solids.There are great varieties of protective coatings (metallic, inorganic, organic) which are used to protect the surface damages caused by corrosive environment.Anticorrosion coatings could be classified according to their activity, like sacrifice and barrier coatings. In the case of sacrificial coatings, an additional metal layer corrodes instead of the base metal. The barrier films should be non-porous; this is how they save the metal from corrosion.Polymers ca...

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“…It is important to follow and quantify the corrosion phenomenon of coatings with encapsulated materials that act only in the case of damage (thin cracks or scratches). Local corrosion along coating discontinuities can be monitored by SEM (Montemor et al, 2012) and scanning electrochemical microscopy (Pilbáth et al, 2012;Zheludkevich et al, 2005). The current of the scanned surface over a scratched coating is decreased significantly by the presence of microcapsules in the coating (Fig.2O.7.2.1).…”

Section: Electrochemical Techniquesmentioning

confidence: 99%

The use of nano-/microlayers, self-healing and slow-release coatings to prevent corrosion and biofouling

Telegdi

Szabó

Románszki

et al. 2014

Handbook of Smart Coatings for Materials Protection

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The mitigation of corrosion and biofouling is a challenge. Through application of chemicals and special techniques can slow these undesired processes, an effective resolution requires a multidisciplinary approach involving scientists, engineers, and metallurgists. In order to understand the importance of the use of nano-and microlayers as well as selfhealing coatings, the basic concepts of corrosion, corrosion mechanisms, corrosion inhibition and the microbiologically influenced corrosion will be summarised. The preparation, characterization and application of Langmuir-Blodgett and self assembled nanolayers in corrosive and microbial environment will be discussed. Preparation and characterization of microcapsules/ microspheres and their application in coatings will be demonstrated by a number of examples.Keywords: nano-and microcoating, self-healing, slow-release, anticorrosion, antifouling IntroductionCorrosion is a well-known problem all over the world. It consumes a significant part of the gross national product (GDP) of developed and developing countries. A number of authors have provided comprehensive introductions to corrosion mainly in aqueous and wet environments (Jones, 1991;Kaesche, 2003; McCafferety, 2010). Corrosion is the destructive result of the chemical/electrochemical reactions between metals and the environment. Corrosive reactions involve water in either liquid or condensed phases. Most corrosion reactions are electrochemical processes. These involve electron or charge transfer in aqueous solution which leads to metal dissolution (anodic reaction). Depending on the pH of the solution, either hydrogen or hydroxonium ions evolve, resulting in oxides, oxyhydroxides, hydroxides and salts formed on the metal surface (cathodic reaction). The electrochemical potential or electron activity affects the rate of corrosion reaction. To understand corrosion it is necessary to discuss briefly the types of corrosion and the reactions involved.Corrosion occurs in various forms.-Uniform corrosion: The metal surface must be compositionally uniform; the aggressive environment has the same access to all parts of the metal. This type of

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SECM study of steel corrosion under scratched microencapsulated epoxy resin

Cited by 54 publications

References 37 publications

Self-healing coatings in anti-corrosion applications

Self-healing coatings in anti-corrosion applications

Micro/nanocapsules for anticorrosion coatings

The use of nano-/microlayers, self-healing and slow-release coatings to prevent corrosion and biofouling

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