Magnesium alloys spontaneous dissolution features under external anodic polarization in presence of inhibitors

Останина, Т. Н.; Рудой, В. М.; Ovsyannikova, A. N.; Malkov, V. B.

doi:10.1134/s1023193510060169

Cited by 8 publications

(5 citation statements)

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“…E.g. 1,2,4-triazole [19][20][21] and benzotriazole [30] were shown to inhibit corrosion of Mg but the reason why it works was not explained. Since both 1,2,4-triazole and benzotriazole form iron complexes [31,32] their inhibition performance might be related to slowing the rate of Fe re-plating.…”

Section: Resultsmentioning

confidence: 99%

“…the ligands that also form highly stable soluble complexes with Mg, e.g. EDTA [30] might not be as efficient because while they reduce iron re-plaiting they will also accelerate dissolution of Mg. On the contrary, 8-hydroxiqyinoline that forms sparingly soluble complex with Mg at alkaline pH [15][16][17] might be more efficiently inhibiting Mg corrosion than it can be predicted from Fe-hydroxyquinolinate stability constant. In general, stability and solubility of both FeL and MgL complexes at neutral and alkaline pH might influence their inhibiting efficiency.…”

Section: Resultsmentioning

confidence: 99%

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

Lamaka

Höche

Petrauskas

et al. 2016

Electrochemistry Communications

103

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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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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

Lamaka

Höche

Petrauskas

et al. 2016

Electrochemistry Communications

103

View full text Add to dashboard Cite

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“…The study [ 19 ] showed that benzotriazole can increase the corrosion resistance of an Mg alloy by promoting the nucleation sites to initiate the formation of crystalline Mg(OH) 2 . It was established [ 20 ] that benzotriazole at the concentration of 0.02 M is an effective corrosion inhibitor that provides uniform magnesium dissolution during the corrosion process. The work [ 21 ] presents a method for protecting the surface of the AZ31B magnesium alloy by forming an anode film in electrolytes containing benzotriazole in various concentrations (3 g/L, 5 g/L, and 10 g/L).…”

Section: Introductionmentioning

confidence: 99%

New Polycaprolactone-Containing Self-Healing Coating Design for Enhance Corrosion Resistance of the Magnesium and Its Alloys

et al. 2022

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The method of hybrid coating formation on the surface of a bioresorbable wrought magnesium alloy and magnesium obtained by additive technology was proposed. Plasma electrolytic oxidation (PEO) with subsequent treatment of the material using an organic biocompatible corrosion inhibitor and a bioresorbable polymer material was used to obtain the protective layers. The optimal method of surface treatment was suggested. Using SEM/EDX analysis, XRD, XPS, and confocal Raman microspectroscopy, the composition of the formed surface layers was determined. The corrosion protection performance of the formed coatings was studied by potentiodynamic polarization and electrochemical impedance spectroscopy techniques in 0.9 wt.% NaCl and HBSS. Hydrogen evolution and mass loss tests were performed to study the corrosion rate of samples with different types of protective coatings. Sealing the pores of PEO coating with a polymeric material contributes to a significant reduction in the amount of the inhibitor diffusing into a corrosive medium. The best barrier properties were established for the hybrid coating formed with a one-stage application of benzotriazole and polycaprolactone. Such layers reduce the rate of alloy degradation due to active protection.

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“…It was found to show a slight inhibition of Mg corrosion in sodium chloride solution at a low concentration of 0.0005 M but the corrosion rate increased at higher concentration [27]. Ostanina et al [77] reported that benzotriazole effectively inhibited Mg dissolution intensity under external anodic polarization at a concentration of 0.002 M. However, the effectiveness declined sharply with increase in concentration.…”

Section: Other Organic Compoundsmentioning

confidence: 99%

An overview on the use of corrosion inhibitors for the corrosion control of Mg and its alloys in diverse media

Umoren

Abdullahi

Solomon

2022

Journal of Materials Research and Technology

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Magnesium alloys spontaneous dissolution features under external anodic polarization in presence of inhibitors

Cited by 8 publications

References 0 publications

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

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

New Polycaprolactone-Containing Self-Healing Coating Design for Enhance Corrosion Resistance of the Magnesium and Its Alloys

An overview on the use of corrosion inhibitors for the corrosion control of Mg and its alloys in diverse media

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