Effects of corrosion inhibition with xanthines in gray cast iron protection with Paraloid B-72 in a saline medium

Espinoza-Vázquez, Araceli; Figueroa, I.A.; Molina, Diego; Rodríguez-Gómez, Francisco Javier; Beltrán, Deyanira Ángeles

doi:10.1016/j.porgcoat.2021.106200

Cited by 2 publications

(4 citation statements)

References 26 publications

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“…Furthermore, both xanthine and cytosine have amino groups, which can also act as reductants for Fe 3+ . Moreover, the broader chemical class of xanthines has been shown to interact with iron during in vitro synthetic chemistry studies and inhibit corrosion in industrial settings ( 53 ). In light of these studies, as well as studies showing how nucleic acid catabolites coordinate with a number of reduced metals including iron ( 54–56 ), xanthine is a conspicuous candidate for further characterization.…”

Section: Discussionmentioning

confidence: 99%

Aerobic iron-oxidizing bacteria secrete metabolites that markedly impede abiotic iron oxidation

Baker,

Matzen,

Schuler

et al. 2023

PNAS Nexus

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Iron is one of the Earth's most abundant elements and is required for essentially all forms of life. Yet, iron's reactivity with oxygen and poor solubility in its oxidized form (Fe3+) mean that it is often a limiting nutrient in oxic, near-neutral pH environments like Earth's ocean. In addition to being a vital nutrient, there is a diversity of aerobic organisms that oxidize ferrous iron (Fe2+) to harness energy for growth and biosynthesis. Accordingly, these organisms rely on access to co-existing Fe2+ and O2 to survive. It is generally presumed that such aerobic iron-oxidizing bacteria (FeOB) are relegated to low-oxygen regimes where abiotic iron oxidation rates are slower, yet some FeOB live in higher oxygen environments where they cannot rely on lower oxygen concentrations to overcome abiotic competition. We hypothesized that FeOB chemically alter their environment to limit abiotic interactions between Fe2+ and O2. To test this, we incubated the secreted metabolites (collectively known as the exometabolome) of the deep-sea iron- and hydrogen-oxidizing bacterium Ghiorsea bivora TAG-1 with ferrous iron and oxygen. We found that this FeOB's iron-oxidizing exometabolome markedly impedes the abiotic oxidation of ferrous iron, increasing the half-life of Fe2+ 100-fold from ∼3 to ∼335 days in the presence of O2, while the exometabolome of TAG-1 grown on hydrogen had no effect. Moreover, the few precipitates that formed in the presence of TAG-1's iron-oxidizing exometabolome were poorly crystalline, compared with the abundant iron particles that mineralized in the absence of abiotic controls. We offer an initial exploration of TAG-1's iron-oxidizing exometabolome and discuss potential key contributors to this process. Overall, our findings demonstrate that the exometabolome as a whole leads to a sustained accumulation of ferrous iron in the presence of oxygen, consequently altering the redox equilibrium. This previously unknown adaptation likely enables these microorganisms to persist in an iron-oxidizing and iron-precipitating world and could have impacts on the bioavailability of iron to FeOB and other life in iron-limiting environments.

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Section: Discussionmentioning

confidence: 99%

Aerobic iron-oxidizing bacteria secrete metabolites that markedly impede abiotic iron oxidation

Baker,

Matzen,

Schuler

et al. 2023

PNAS Nexus

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“…Cu + surf − e − ↔ Cu 2+ sol (14) Due to adsorption of purine and adenine on a copper surface, current density decreases, which are proved by both potentiodynamic and potentiostatic polarization. Electrochemical quartz crystal microbalance measurements proved the adsorption since the mass loss is considerably lower in the presence of inhibitors.…”

Section: Chloride Mediamentioning

confidence: 99%

“…Due to the presence of heteroatoms in the molecular structure and their non-toxicity, methylxanthines, Table S1, are interesting as corrosion inhibitors for steel. In order to study inhibition properties of caffeine and theophylline for grey cast iron in 3 wt % NaCl, Espinoza Vázquez et al [14] conducted electrochemical experiments using electrochemical impedance spectroscopy and potentiodynamic polarization techniques. Additionally, the synergistic effect of xanthines and coating (Paraloid B-72) was examined in a saline medium.…”

Section: Chloride Mediamentioning

confidence: 99%

“…In 1985, Abdel Aal and Wahdan [12] studied purine as an inhibitor of corrosion of steel in HClO 4 solution. Until now, they have been tested as corrosion inhibitors for numerous metals and alloys such as steel [13,14], aluminum [15,16], tin, indium, both pure and in the form of alloys [17,18], titanium [19], Mg alloys [20,21], copper [22][23][24][25], brass [26], nickel [27], and alloys such as Sn-Ag alloy [28] and CoCrMo alloy [29]. Purine compounds exhibit an inhibiting effect toward metal corrosion in various aqueous media but also in hydrocarbon media such as highly refined naphthenic mineral base oil [30].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electrochemical Analysis of the Influence of Purines on Copper, Steel and Some Other Metals Corrosion

Mihajlović¹,

Tasić²,

Radovanović³

et al. 2022

Metals

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Metals stability and corrosion resistance are very important factors that influence the possibility of their applications. In order to study and foresee the behavior of metals during various applications in all kinds of conditions and media, numerous approaches and techniques are developed and applied. Among those techniques, electrochemical measurements nowadays have a dominant role since they are proved to be highly efficient, reliable, fast, relatively low-cost, and easy regarding the preparation and execution of measurements. Besides that, they also provide quite a good amount of data regarding the effect and the mechanism of the reactions that metals interact in. Metals corrosion is reduced by various methods, one of the most frequently used ones is the application of corrosion inhibitors. Usually, organic compounds are studied as potential corrosion inhibitors, and at the moment the focus is on the effect on the environment. Hence, environmentally friendly and non-toxic inhibitors are important research topics. Purines, since they are the group of bioorganic compounds found in numerous biochemical structures such as DNA and RNA, present a very interesting possible solution and are studied as inhibitors of corrosion for copper, steel, aluminum, etc., as well as for some metal alloys. Data obtained and available up until the present are presented and discussed in this review.

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Effects of corrosion inhibition with xanthines in gray cast iron protection with Paraloid B-72 in a saline medium

Cited by 2 publications

References 26 publications

Aerobic iron-oxidizing bacteria secrete metabolites that markedly impede abiotic iron oxidation

Aerobic iron-oxidizing bacteria secrete metabolites that markedly impede abiotic iron oxidation

Electrochemical Analysis of the Influence of Purines on Copper, Steel and Some Other Metals Corrosion

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