Accelerater of Steel Oxidation in Ammonium Nitrate Solutions

Kuznetsov, Yu. I.; Макаров, Д. А.; Vershok, D. B.

doi:10.1023/b:prom.0000013104.66432.fe

Cited by 3 publications

(1 citation statement)

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“…Our studies showed [48] that in some cases, the thickness () can be increased by heterocyclic CIs (Figure 8) without deteriorating the decorative properties of an MC and its adhesion to steel surface. Another way of improving an MC is to use complex-forming CIs, e.g., HEDP or its complexes [49]. The nature of the complexing cation of a CI plays an important role in MC modification.…”

Section: Goal-oriented Corrosion Inhibitorsmentioning

confidence: 99%

Progress in the science of corrosion inhibitors

Kuznetsov

pr.²,

Moscow³

et al. 2015

Int. J. Corros. Scale Inhib.

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The physicochemical features of corrosion inhibition of metals (alloys) strongly depend on the composition of the corrosive environment, its pH, temperature t, hydrodynamic conditions, the chemical nature of the metal to be protected, and the state of its surface, the presence of oxides, dirt, or corrosion products on it. This "multifactor" nature of corrosion seriously complicates the theoretical choice of an efficient corrosion inhibitor (CI), often requiring careful experimental studies and creating unjustified skepticism about the fundamental character of the physical chemistry area related to the study and development of CIs. Meanwhile, this skepticism can be proved wrong by the progress made over the past quarter century in various subareas. Key words: corrosion inhibitors, adsorption, metal passivation, volatile corrosion inhibitors, migrating inhibitors, local depassivation of metals, protecting coatings. Adsorption of corrosion inhibitors on metals and passivationAdsorption on a protected surface is the first event that often determines CI efficiency. Difficulties of its measurement in situ are caused by dissolution and/or oxidation of the metal substrate with time. The uncertainty in separating the effects of adsorption and changes of the state of the metal surface often does not permit to unambiguously interpret the results obtained, for example, by electrochemical impedance spectroscopy (EIS) or using radioactive tracers. In his first "Inhibitors of corrosion of metals in neutral media" (1953), I.L. Rozenfel'd considered only inorganic CIs. He remained interested in these inhibitors throughout his whole life, so it is not surprising that in his latest book "Corrosion Inhibitors" (1977) he reexamined the interaction of some inorganic CIs, primarily chromate, with the metal at a more modern level, including a quantum-chemical approach. However, studies on the

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Section: Goal-oriented Corrosion Inhibitorsmentioning

confidence: 99%

Progress in the science of corrosion inhibitors

Kuznetsov

pr.²,

Moscow³

et al. 2015

Int. J. Corros. Scale Inhib.

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Oxidation Features of Low-Carbon Steel in Nitrate Solutions

Vershok

Тимофеева²,

Misurkin³

et al. 2022

Prot Met Phys Chem Surf

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Study on efficiency of corrosion inhibitors based on derivatives of isothiuronic salts

Ushakov

Nikonova

Полынский

et al. 2021

Izvestiâ vuzov. Prikladnaâ himiâ i biotehnologiâ

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Metals play a pivotal role in industry; their use constantly grows. It is virtually impossible to find an industrial field without the use of metals and their alloys. However, owing to the quality degradation of metal during the operational process, corrosion appears not only on its surface but also under a coating, which leads to its destruction. To avoid this, corrosion inhibitors are necessary. Organic compounds have been widely used as corrosion inhibitors. Many organic corrosion inhibitors have been developed nowadays. In the literature, organic compounds comprising N, O, S and P heteroatoms are described, which reduce corrosion rate. The organic compounds are adsorbed on the metal surface, forming a thin layer. Adsorption occurs either through electrostatic interaction or, in some cases, the formation of covalent bonds. The work aimed to study isothiuronic salts as corrosion inhibitors to evaluate their protective properties using the polarisation curves method. Objects of research were isothiuronic compounds containing two active centres separated by saturated and unsaturated carbon bonds (structures 1-3). In structures 4-7, one isothiuronic fragment has different propylene substituting groups. It has been previously shown that these compounds can act as effective brightening agents when applying nickel coatings. A model solution with a density of 1.12 g/cm3 was prepared to study the corrosion inhibitors. The corrosion inhibitor concentration was 400 mg/L. Studies have shown that the compounds with two isothiuronic moieties do not always exhibit improved properties for inhibiting metal degradation in a corrosive environment. In particular, they showed worsening of the inhibiting properties for samples made of steel 20 and identical properties for that made of steel 3.

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Accelerater of Steel Oxidation in Ammonium Nitrate Solutions

Cited by 3 publications

References 0 publications

Progress in the science of corrosion inhibitors

Progress in the science of corrosion inhibitors

Oxidation Features of Low-Carbon Steel in Nitrate Solutions

Study on efficiency of corrosion inhibitors based on derivatives of isothiuronic salts

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