Corrosion-inhibitor orientation on steel

Salensky, George A.; Cobb, M.; Everhart, D. S.

doi:10.1021/i300022a002

Cited by 25 publications

(18 citation statements)

References 3 publications

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“…Contrary to the authors [30], the sodium salt of rather a strong carboxylic acid (sodium fluphenaminate, SFPh, o- [3- Among monocarboxylic acid salts, SOS is noteworthy. It is not only one of the most efficient water-soluble nonoxidative organic passivators for steels [18,21,35], but also has rather universal protective properties and prevents corrosion of Cu, Zn, Mg, Al and their alloys in corrosive neutral media [26,[36][37][38]. The high adsorption ability of SOS on steels has been known for a long time.…”

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confidence: 99%

“…This is not surprising, since SOS is known as a colloid surfactant that is used in a wide range of industrial applications because of its low toxicity [39]. Salensky et al [35] studied the adsorption of SOS on mild steel from a heptane solution by means of ellipsometry, FT-IR and XPE spectroscopy. They argued that SOS chemisorption was due to the coordination of N and O atoms with the metal ions and formation of five-membered chelate rings.…”

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confidence: 99%

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Organic corrosion inhibitors: where are we now? A review. Part II. Passivation and the role of chemical structure of carboxylates

Kuznetsov

2016

Int. J. Corros. Scale Inhib.

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This article provides an overview of works (2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016) devoted to the passivation of various metals and the influence of organic carboxylic acids and their salts thereon. The results of corrosion and electrochemical studies, as well studies on the composition and structural features of surface layers on the metals being protected by a variety of physicochemical methods are considered. Protection of metals by organic corrosion inhibitors (CIs) is based mostly on the adsorption of these compounds on a metal surface and subsequent formation of protective layers that minimizes access of corrosive ions to that surface. Adsorption can occur via electrostatic interaction of the CI with the metal substrate (physisorption), or it can involve charge sharing between the surface and CI (chemisorption), or combination of both interaction types can take place. Passivation of metals remains a central problem to be solved by the corrosion science. In the development of nanoindustry methods focused on creating ultrathin layers on metals capable of preventing the corrosion of the metals, an important role is played by surface passivation using CIs. Corrosion inhibitors can form passivating (often polymolecular) layers on metals but with thickness d < 10 nm, making them invisible to an unaided eye and keeping intact the decorative properties of a coated article's surface. This passivation can be done using volatile CIs from the vapor phase or nonvolatile CIs from aqueous solutions. Since metal passivation using conventional corrosion inhibitors of oxidizing type (e.g., nitrites, chromates) is seriously limited in practice due to environmental considerations, requirements for inhibiting formulations keep changing over time.The use of corrosion inhibitors in passivation has played a major role not only in the application of oxidants (chromates, nitrites, etc.) but also in adsorptive, often "oxideless" passivation that we discovered as early as in the mid-1970s [1]. As for corrosion inhibitors

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confidence: 99%

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confidence: 99%

Organic corrosion inhibitors: where are we now? A review. Part II. Passivation and the role of chemical structure of carboxylates

Kuznetsov

2016

Int. J. Corros. Scale Inhib.

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“…4 also provides information on the orientation of the aliphatic chain of the DPC molecule in relation to the steel substrate. The presence and intensity of both the CH 2 symmetric and antisymmetric stretching vibrations in the spectra indicates that the aliphatic chain is tilted upwards from the steel substrate but is not perpendicular to it because a perpendicular aliphatic chain (in relation to the substrate) would result in absorption by the antisymmetrical C-H stretching only [23]. The weak band at 1466 cm -1 (Fig.…”

Section: Proposed Orientation Of Dpc Molecules At the Steel Surfacementioning

confidence: 95%

Synchrotron infrared microspectroscopy study of the orientation of an organic surfactant on a microscopically rough steel surface

Lepková

Bronswijk

Pandarinathan

et al. 2013

Vibrational Spectroscopy

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The performance of organic surfactants as corrosion inhibitors is influenced by the mechanism of adsorption and the resulting molecular orientation on the substrate. The molecular orientation of 1-dodecylpyridinium chloride (DPC) deposited on non-corroded 1030 mild steel and after corrosion in a carbon dioxide environment has been investigated using synchrotron infrared microspectroscopy. DPC mitigates the corrosion process by adsorbing at the steel surface and forming a protective layer. Infrared spectra analogous to polarized grazing angle spectra were obtained from a microscopically rough surface using a synchrotron source. The appearance of negative and positive absorption bands in the spectra, when using synchrotron radiation, is discussed in terms of the optical system used. The presence of the DPC surfactant at the steel surface is shown by the CH 2 and CH 3 infrared absorption bands of the aliphatic chain of the DPC molecule. The infrared spectra provide direct evidence on the orientation of DPC at the steel substrate. The aliphatic chain of the surfactant is tilted orthogonally, but not perpendicular to the substrate plane. The absence of significant absorption bands characteristic of the pyridinium ring of DPC indicates its orientation parallel to the substrate plane, and an adsorption mechanism involving πbonding with the steel. This study demonstrates the applicability of synchrotron infrared microspectroscopy to the investigations of thin organic films on microscopically rough steel surfaces, and can facilitate further investigations of thin films on metallic surfaces and monolayer studies in general.

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“…Sodium N-oleylsarcosinate (OS) is able to form passive films on the metals in neutral chloride-containing buffer solution. Stabilization of the passive surface is associated with strong adsorption of OS due to coordination of nitrogen and oxygen atoms to metal ions and the formation of a five-membered chelate ring [60,61].…”

Section: Organic Corrosion Inhibitorsmentioning

confidence: 99%