Nano-FTIR microscopy and spectroscopy studies of atmospheric corrosion with a spatial resolution of 20nm

Johnson, Claes; Böhmler, Miriam

doi:10.1016/j.corsci.2016.02.037

Cited by 24 publications

(15 citation statements)

References 24 publications

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“…Infrared (IR) and Raman spectroscopy are applied in the field of cultural heritage and modern art materials due to their potential for non-invasive measurements [2,15,16,17,18,19]. Examples include the identification of pigments and degradation mechanisms in works of art, such as atmospheric corrosion [20,21,22] and the determination of trade routes [15]. However, for the development of protective coatings for metal/alloy art objects, more informative yet more invasive studies of coatings exposed to weathering are needed.…”

Section: Introductionmentioning

confidence: 99%

Development of solvent- and water-borne fluoropolymer protective coatings for patina-free bronze discs

Mihelčič

Perše

Šest

et al. 2018

Progress in Organic Coatings

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Solvent-(SB) and water-borne (WB) fluoropolymer coatings were produced for the outdoor protection of bronze. The coatings were prepared from commercially available resins with alternating fluoroethylene/vinylether copolymers. Because any application of protective coatings on works of art requires that they be removable in accordance with conservation ethics, various approaches to achieve removability of coatings were tested. The influence of modifications was verified through comparisons of hydrophobic, compact and irremovable protective coatings. Consequently, we prepared four types of coatings: two SB coatings and two WB coatings. The first SB coating was designed to have a hydrophobic compact structure (SB-c coating), and the second SB coating was modified with the addition of agents that impart strippability (SB-h coating). The same approach was used for the preparation of the two WB coatings: a compact (WB-c) coating vs. a hydrophilic (WB-h) coating, the latter being prepared through the addition of hydrophilic polyisocyanate. The surface properties of the coatings were compared using scanning electron (SEM) and atomic force (AFM) microscopy. WB coatings were found to be more homogeneous in comparison with SB coatings and to have lower surface roughness. Contact angles confirmed the more hydrophobic nature of SB coatings. Potentiodynamic polarisation measurements and accelerated corrosion tests (exposure to acid vapours) revealed that protection efficiency not only increased with thickness but significantly depended on the coating structure. The 2 structure of coatings depended on the rheological parameters of the formulations simulating their behaviour during storage, deposition, and formation of the dry coating. Combined electrochemical and vibrational spectroscopic experiments were used to simulate long-term outdoor exposure of the protective coatings. Ex situ IR RA spectroelectrochemical measurements showed that hydration was more prevalent with WB coatings, and oxidation of bronze at the interface eventually occurred (656 cm-1 band). WB coatings with more free C=O groups were more prone to degradation. In situ Raman spectroelectrochemistry confirmed the better protection efficiency of SB over WB coatings. The optical properties of the coatings on glass showed higher transmittance for WB coatings compared to SB coatings.

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Section: Introductionmentioning

confidence: 99%

Development of solvent- and water-borne fluoropolymer protective coatings for patina-free bronze discs

Mihelčič

Perše

Šest

et al. 2018

Progress in Organic Coatings

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“…With the novel technique nano FTIR microscopy both these problems are resolved, and the nature of corrosion products can be determined with a spatial resolution of 20 nm. Johnson et al, studied the distribution of the corrosion products cuprite and copper formate at a copper surface exposed to 80% RH and 100 ppb formic acid, to simulate an indoor corrosion process [ 74 ]. IRRAS was initially used to determine the nature of the corrosion products over the whole surface, and nano IR to scrutinize the spatial distribution of corrosion products.…”

Section: Resultsmentioning

confidence: 99%

Vibrational Spectroscopy in Studies of Atmospheric Corrosion

Hosseinpour

Johnson

2017

Materials

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Vibrational spectroscopy has been successfully used for decades in studies of the atmospheric corrosion processes, mainly to identify the nature of corrosion products but also to quantify their amounts. In this review article, a summary of the main achievements is presented with focus on how the techniques infrared spectroscopy, Raman spectroscopy, and vibrational sum frequency spectroscopy can be used in the field. Several different studies have been discussed where these instruments have been used to assess both the nature of corrosion products as well as the properties of corrosion inhibitors. Some of these techniques offer the valuable possibility to perform in-situ measurements in real time on ongoing corrosion processes, which allows the kinetics of formation of corrosion products to be studied, and also minimizes the risk of changing the surface properties which may occur during ex-situ experiments. Since corrosion processes often occur heterogeneously over a surface, it is of great importance to obtain a deeper knowledge about atmospheric corrosion phenomena on the nano scale, and this review also discusses novel vibrational microscopy techniques allowing spectra to be acquired with a spatial resolution of 20 nm.

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“…Apesar de recentemente um estudo ter focado na aplicação de nano-FTIR em corrosão metálica de Cu, analogamente ao aqui apresentado, destaca-se que não foi utilizada radiação síncrotron. 42 É muito importante ressaltar que a técnica SINS corresponde à combinação de s-SNOM com uma fonte do síncrotron de radiação no infravermelho. As características de alta intensidade, em amplo espectro, e razoável colimação do feixe infravermelho inerentes à radiação síncrotron são pontos essenciais que permitem, à técnica SINS, superar a importante limitação de se sondar baixíssimos volumes de material, ca.…”

Section: Conclusõesunclassified

Nanoespectroscopia De Absorção De Radiação Síncrotron No Infravermelho Para Nanoespeciação De Produtos De Corrosão Metálica

et al. 2019

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SYNCHROTRON INFRARED NANO-SPECTROSCOPY FOR NANO-SPECIATION OF METAL CORROSION PRODUCTS. The understanding of chemical and physical behavior of materials, especially metals and their alloys, is of utmost importance for industrial and technological applications, development of new materials and preservation of cultural heritage. The use of complementary analytical techniques has allowed a better understanding of corrosion mechanisms, and results obtained by Raman micro-spectroscopy, for example, have been complemented by FTIR and XRD. When focusing on the development of new materials and proposition of preservation strategies, the understanding of corrosion processes and of their very initial steps (nanometric scale) is fundamental. SERS reaches such lateral resolution if TERS is used, however, it cannot be universally applied and needs to be complemented by other techniques. In this work it is presented the potentials of a recent installed technique at the Brazilian Synchrotron Light Laboratory (LNLS), which can be used for nano-speciation of corrosion products, complementing investigation carried out by, for example, Raman micro-spectroscopy and TERS. It is Synchrotron Infrared Nano-Spectroscopy (SINS), which allows the investigation of both chemical nature and physical distribution of corrosion products. The infrastructure presented at LNLS is one of the few available in the world. As a model system, thin films of Pb exposed to formic acid were used.

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Nano-FTIR microscopy and spectroscopy studies of atmospheric corrosion with a spatial resolution of 20nm

Cited by 24 publications

References 24 publications

Development of solvent- and water-borne fluoropolymer protective coatings for patina-free bronze discs

Development of solvent- and water-borne fluoropolymer protective coatings for patina-free bronze discs

Vibrational Spectroscopy in Studies of Atmospheric Corrosion

Nanoespectroscopia De Absorção De Radiação Síncrotron No Infravermelho Para Nanoespeciação De Produtos De Corrosão Metálica

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