Adsorption of dioctyl phosphate and inhibition of dissolution of low-carbon steel in neutral solution

Чиркунов, А. А.; Gorbachev, A. S.; Kuznetsov, Yu. I.; Andreeva, N. P.

doi:10.1134/s2070205113070058

Cited by 5 publications

(17 citation statements)

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“…An increase in the exposure of the electrode to the solution at elevated t can also play a substantial role [10]. In contrast to room temperature, where mild steel is spontaneously passivated at C SDOP = 0.10 mmol/l, though its depassivation by chlorides is facilitated, at the same C SDOP and an exposure time of 90 min E pit is shifted in the positive direction from the reference value in the blank solution.…”

Section: Organic Esters Of Phosphoric Acidmentioning

confidence: 99%

“…Salts of these acids are used in cooling lubricants, e.g., waterbased cutting fluids. The low toxicity, ability to be chemisorbed on a metal surface, and some useful technological properties of acid esters of phosphoric acid continue to motivate researchers to look for effective corrosion inhibitors of various metals among these compounds and to study their protection mechanisms [5][6][7][8][9][10][11][12][13][14]. …”

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confidence: 99%

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

2017

Int. J. Corros. Scale Inhib.

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This article continues the review of studies (2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016) dealing with the passivation of various metals by solutions of organic corrosion inhibitors. It provides an overview of papers on the passivating properties of organophosphates, their complexes and salts. The results of corrosion and electrochemical studies, as well as studies on the composition and structural features of surface layers on metals by a variety of physicochemical methods are considered. Organic phosphorus compounds are often called organophosphates, especially in the case of pesticides and even toxic agents. Of course, it is unlikely that such materials have application prospects for the inhibition of metal corrosion. That is why in this series of reviews we consider organophosphates in a narrower sense limited to phosphoric acid esters and their salts, as well as phosphonic acids, their salts or complex compounds with metal cations [1][2][3][4]. The easy synthesis of acid esters of phosphoric acid, the stability of mono-and disubstituted ester anions, their ability to form complexes and hydrophobic passive films on oxidized metal surfaces has been known for a long time [1]. They can be used for the passivation of phosphated metal surfaces, and their salts with amines are used within deicing formulations. These salts can inhibit not only corrosion but also formation of deposits, so they are used in two-phase systems in the oil industry. Since higher homologues are more effective, the solubility of alkylphosphonic acids is commonly increased by ethoxylation. Salts of these acids are used in cooling lubricants, e.g., waterbased cutting fluids. The low toxicity, ability to be chemisorbed on a metal surface, and some useful technological properties of acid esters of phosphoric acid continue to motivate researchers to look for effective corrosion inhibitors of various metals among these compounds and to study their protection mechanisms [5][6][7][8][9][10][11][12][13][14]. Key words: metal corrosion, inhibitors, metal passivation, organophosphates.

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Section: Organic Esters Of Phosphoric Acidmentioning

confidence: 99%

mentioning

confidence: 99%

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

2017

Int. J. Corros. Scale Inhib.

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“…Therefore, when a steel is covered by a natural oxide film, salts of benzoic acid (benzoates) often exhibit properties of corrosion inhibitors. Our adsorption study of organic CIs has also shown that they can be differently adsorbed from neutral aqueous solutions on a reduced ("clean") and oxidized metal surface [1,[4][5][6][7]. In connection with this, it is important to find CIs that can be strongly adsorbed not only on a clean metal but also on an oxidized surface and stabilize its passive state due to a shift in the potential of local depassivation, E pit , to more positive values.…”

mentioning

confidence: 99%

“…In an air-saturated solution at room temperature, Eq. (5) is reduced to: p H c = log c s + pK a + 2.95 (6) Without denying the role of basicity, it should be noted that this simplification in the evaluation of the chemical structure of carboxylates offers little prospects. It is also necessary to take into account the second criterion, viz., hydrophobicity of the molecules or the carboxylate anion, which is often more important than the pK a of the acid.…”

mentioning

confidence: 99%

“…Recently the influence of sodium salts of some higher carboxylates (sodium laurate, SL [C 11 H 23 COONa]; sodium linolenate, [C 2 H 5 (CH=CH-CH 2 ) 3 (CH 2 ) 6 COONa]; SOl and SOS) on the anodic dissolution of Mg-90 (Mg 99.9%; Fe ≤ 0.04%; Mn ≤ 0.03%; Al ≤ 0.02%; Ni ≤ 0.001%; Cu ≤ 0.004%; Si ≤ 0.009%) in borate buffer solution with pH 7.4 was studied in our laboratory [38]. Sodium oleate (SOl) was found to possess the best protective and passivating properties.…”

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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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Phosphonate biogeochemical cycling in the marine environment: from an ocean scale to a molecular scale

Acker¹

2021

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The existence of a marine phosphorus (P) redox cycle was recently confirmed when phosphonates, organophosphorus compounds with P in the (III) oxidation state, were found in high molecular weight dissolved organic matter. Although some features of the P redox cycle have come to light since the discovery of phosphonates, many aspects of phosphonate production, cycling and fate remain unknown. To address these gaps in our understanding, we studied phosphonate cycling in the Eastern Mediterranean Sea, a chronically P-limited basin, using 33 P and enzymatic assays. We showed that phosphonate production was low but consumption was high, suggesting that phosphonate production and consumption may be spatially or temporally decoupled. We also explored phosphonate production in the model marine cyanobacterium Prochlorococcus SB. Using 31 P NMR, we found Prochlorococcus SB allocates ~50% of its cellular P to phosphonates. Allocation of P to phosphonates was conserved under P-limitation, and further investigation revealed phosphonates were associated with proteins. The discovery of phosphonoproteins in Prochlorococcus SB opens new perspectives on the biochemical function of phosphonates and their role in P-cycling. Finally, we developed a new P-targeted method to characterize marine organophosphorus compounds using liquid chromatography coupled to electrospray ionization and inductively coupled plasma mass spectrometry.

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Adsorption of dioctyl phosphate and inhibition of dissolution of low-carbon steel in neutral solution

Cited by 5 publications

References 1 publication

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

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

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

Phosphonate biogeochemical cycling in the marine environment: from an ocean scale to a molecular scale

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