SECM study of defect repair in self-healing polymer coatings on metals

González-García, Yaiza; Mol, J.M.C.; Muselle, Thibault; Graeve, Iris De; Assche, Guy Van; Scheltjens, Gill; Mele, Bruno Van; Terryn, Herman

doi:10.1016/j.elecom.2010.12.005

Cited by 94 publications

(38 citation statements)

References 23 publications

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“…Application of organic coatings is one of the most widespread techniques for corrosion protection of the metallic substrates. Since various external factors can cause formation of pores and cracks in the coating through which water and corrosive species can di use and reach the metal surface; recently, considerable interest has been given to the use of corrosion protection systems that provide not only a physical barrier against aggressive species, but also an active self-healing ability [1][2][3][4]. One of the main strategies to achieve the active e ect is to apply micro/nanostructured hosting systems for encapsulation of corrosion inhibitors and to incorporate the capsules into the coating system.…”

Section: Introductionmentioning

confidence: 99%

pH-Responsive Nanostructured Polyaniline Capsules for Self-Healing Corrosion Protection: The Influence of Capsule Concentration

et al. 2017

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Abstract. Nanostructured hollow polyaniline (PANI) capsules are good candidates for encapsulation of corrosion inhibitors and pH-responsive release when incorporated into organic coatings. In previous studies, the corrosion protection performance of PANI capsules, containing organic inhibitor 2-Mercaptobenzothiazole (MBT), was demonstrated. The present work studies the in uence of capsule concentrations (i.e., 0.3, 1, and 2 wt%) on the corrosion protection properties of the coating system. Anti-corrosion properties of di erent coatings were compared by means of Electrochemical Impedance Spectroscopy (EIS) and Scanning Vibrating Electrode Technique (SVET). MBT loaded PANI capsules in epoxy ester coating on AA2024-T3 substrate allow for a self-healing e ect to be obtained during the corrosion process. The results showed that the concentration of MBT loaded PANI capsules greatly in uences the corrosion protection properties of the coatings, and the best corrosion protection performance was observed for the coating system containing 1 wt% PANI capsules. The impedance value of the scratched area of this coating after 7 days of immersion was one order of magnitude higher than that of the control sample.

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Section: Introductionmentioning

confidence: 99%

pH-Responsive Nanostructured Polyaniline Capsules for Self-Healing Corrosion Protection: The Influence of Capsule Concentration

et al. 2017

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“…The SECM allows us to monitor in-situ the corrosion taking place within a coating defect [29]. The deterioration of organic coatings through a defect on metallic surfaces [28,[30][31][32], the spontaneous deterioration of the organic coatings on different metals [32][33][34] and the defect repair in self-healing, shapememory polymer coating [35], and encapsulated silyl esther [36], coil-coated cladding [37] were all monitored by the SECM technique.…”

Section: Introductionmentioning

confidence: 99%

SECM study of steel corrosion under scratched microencapsulated epoxy resin

Pilbáth

Szabó

Telegdi

et al. 2012

Progress in Organic Coatings

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Scratch tests were performed on epoxy coated steel samples with and without microcapsulated linseed oil, known to develop a polymerized protective layer after having been released from the capsules at the damaged sites. The scanning electrochemical microscope has been applied to monitor the protection efficiency of this self-healing coating in aqueous acidic solution. In the proximity of the local damage, both the anodic metal dissolution and the cathodic oxygen reduction showed that the coating with microcapsules substantially and spontaneously decreased the rate of corrosion proving the self-repair concept of the coating. Electrochemical impedance measurements underline the protective effect of the coating as well.

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“…SECM imaging experiments can be performed by either feedback or generation-collection (G-C) mode. [6] SECM has been applied successfully to a great variety of corrosion processes including the visualization of anodic and cathodic areas, [7,8] the identification of precursor sites for pitting corrosion, [9][10][11][12] the detection of metastable pit nucleation, [13] the generation of single pits on passive metals, [14][15][16][17][18] the dissolution of inclusions in alloys, [19][20][21] the water uptake and blister formation at organic-coated metals, [22][23][24] the degradation of organic coatings from metal-coating interfaces, [25][26][27][28] the permeation of hydrogen through metals, [29] and the characterization of chemical inertness of ceramic coatings on metals. [30,31] In most instances, the corrosion process is followed through the detection of the metal ion released in the aqueous phase from the corresponding corroding metal or metal alloy.…”

Section: Introductionmentioning

confidence: 99%

In Situ Scanning Electrochemical Microscopy (SECM) Detection of Metal Dissolution during Zinc Corrosion by Means of Mercury Sphere‐Cap Microelectrode Tips

González-García

Battistel

Daniele

2011

Chemistry A European J

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This work presents a scanning electrochemical microscopy (SECM)‐based in situ corrosion probing methodology that is capable of monitoring the release of zinc species in corrosion processes. It is based on the use of Hg‐coated Pt microelectrodes as SECM tips, which offer a wider negative potential range than bare platinum or other noble‐metal tips. This allows for the reduction of zinc ions at the tip to be investigated with low interference from hydrogen evolution and oxygen reduction from aqueous solutions. The processes involved in the corrosion of zinc during its immersion in chloride‐containing solutions were successfully monitored by scanning the SECM tip, set at an adequate potential, across the sample either in one direction or in the X–Y plane parallel to its surface. In this way, it was possible to detect the anodic and cathodic sites at which the dissolution of zinc and the reduction of oxygen occurred, respectively. Additionally, cyclic voltammetry (CV) or constant potential measurements were used to monitor the release of zinc species collected at the tip during an SECM scan.

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SECM study of defect repair in self-healing polymer coatings on metals

Cited by 94 publications

References 23 publications

pH-Responsive Nanostructured Polyaniline Capsules for Self-Healing Corrosion Protection: The Influence of Capsule Concentration

pH-Responsive Nanostructured Polyaniline Capsules for Self-Healing Corrosion Protection: The Influence of Capsule Concentration

SECM study of steel corrosion under scratched microencapsulated epoxy resin

In Situ Scanning Electrochemical Microscopy (SECM) Detection of Metal Dissolution during Zinc Corrosion by Means of Mercury Sphere‐Cap Microelectrode Tips

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