Inhibitors for magnesium corrosion: Metal organic frameworks

Mesbah, Adel; Juers, C.; Lacouture, Françoise; Mathieu, Sandrine; Rocca, Emmanuel; François, Michel; Steinmetz, J.

doi:10.1016/j.solidstatesciences.2006.12.007

Cited by 59 publications

(13 citation statements)

References 5 publications

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“…The aliphatic chain length controls the anion solubility and the reaction rate of Mg carboxylate formation. This conclusion is in agreement with the results of Mesbah et al [63], who also found that the inhibiting effect of carboxylates was due to a layer of insoluble Mg salts. Sodium octanoate is not a CI at all, while 0.01 M sodium decanoate rapidly forms Mg decanoate, but its protective effect substantially diminishes because the crystals do not form a very compact layer.…”

supporting

confidence: 93%

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: 93%

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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“…The influence of the aliphatic chain becomes evident by admitting, in agreement with [6,15], that the inhibiting action of the carboxylic anions is due to a layer of insoluble magnesium carboxylate, precipitated onto the specimen surface. First of all, the aliphatic chain controls the anion solubility in the solution, as well as the reaction rate of magnesium salt formation, whose solubility should be lower, the longer is the chain.…”

Section: Discussionsupporting

confidence: 66%

Sodium monocarboxylates as inhibitors of AZ31 alloy corrosion in a synthetic cooling water

Zucchi

Grassi

Zanotto

2009

Materials & Corrosion

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This research investigated the inhibiting effects that sodium salts of linear monocarboxylic acids displayed towards the corrosion process of AZ31 Mg alloy in ASTM D 1387 saline solution (a synthetic industrial cooling water). The length of the aliphatic chain of the acids ranged between 7 and 15 carbon atoms. The inhibiting action of these salts can be related to the precipitation of an insoluble magnesium salt, which mainly affected the anodic reaction. The aliphatic chain length controlled the anion solubility and the reaction rate of magnesium carboxylate formation. For all the salts, an optimum concentration was experienced: 10 À2 M for sodium decanoate (caprate), 10 À3 M for sodium dodecanoate (laurate), 10 À4 M for sodium tetradecanoate (myristate); when this concentration was exceeded, a diminution (even a disappearance) in the inhibiting action was found.

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“…Eaves et al [2] showed efficient inhibition by arsenates at acidic conditions. However, with a few exceptions, most of the reported inhibitors aim at supressing anodic dissolution of Mg. Mesbah et al [13] used decanoate and heptanoate as anodic inhibitors. Their inhibiting mechanism based on Mg salt precipitation at the surface (partially protective film).…”

Section: Introductionmentioning

confidence: 99%

A new concept for corrosion inhibition of magnesium: Suppression of iron re-deposition

Lamaka

Höche

Petrauskas

et al. 2016

Electrochemistry Communications

105

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In our recent work (Höche et al. 2015) we proposed that non-faradaic dissolution of Fe impurities and subsequent re-deposition of thin film of pure ("in statu nascendi") iron enlarges cathodically active sites at Mg surface. The effect drastically accelerates corrosion of impurity containing Mg. In this work we assumed that if Fe re-deposition is prevented, the area of cathodic sites can be drastically decreased and hence corrosion of Mg can be suppressed. In this prove of concept work we used strong Fe 3+ complexing agents in order to remove dissolved iron from corrosion sites and prevent iron re-deposition. All used iron complexing agents efficiently lowered the corrosion rate of Mg. Direct correlation of complex stability with its inhibiting efficiency was established. It was shown that cyanide, salicylate, oxalate, methylsalicylate and thiocyanate efficiently reduce hydrogen evolution and suppress critical dark area formation.

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Inhibitors for magnesium corrosion: Metal organic frameworks

Cited by 59 publications

References 5 publications

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

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

Sodium monocarboxylates as inhibitors of AZ31 alloy corrosion in a synthetic cooling water

A new concept for corrosion inhibition of magnesium: Suppression of iron re-deposition

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