In situ formation of LDH-based nanocontainers on the surface of AZ91 magnesium alloy and detailed investigation of their crystal structure

Shulha, Tatsiana; Serdechnova, Maria; Iuzviuk, Mariia H.; Zobkalo, I.A.; Karlova, Polina; Scharnagl, Nico; Wieland, D. C. Florian; Lamaka, Sviatlana V.; Yaremchenko, A.A.; Blawert, Carsten; Zheludkevich, Mikhail L.

doi:10.1016/j.jma.2021.10.006

Cited by 30 publications

(15 citation statements)

References 72 publications

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“…Typically, LDH is formed from the Al 3+ /Mg 2+ containing electrolyte and precipitates on the Mg surface at high pressure, usually in an autoclave. Recently, a step forward has been made by succeeding in intrinsic in situ growth of Mg–Al LDH at ambient pressure [ 385 , 386 ]. The AZ91 alloy was introduced into Al 3+ containing aqueous electrolyte containing organic additives (e.g.…”

Section: Conversion Coatingsmentioning

confidence: 99%

“…The AZ91 alloy was introduced into Al 3+ containing aqueous electrolyte containing organic additives (e.g. sodium salt of nitrilotriacetic acid (NTA) [ 385 ]) and then the more environmentally benign diethylenetriaminepentaacetic acid (DTPA) pentasodium salt [ 386 ]. Superficial dissolution of the alloy generated Mg 2+ cations, followed by their precipitation as Mg–Al LDH, which greatly improves the adhesion of grown layers and hence their protective ability.…”

Section: Conversion Coatingsmentioning

confidence: 99%

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Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

et al. 2022

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Corrosion protection systems based on hexavalent chromium are traditionally perceived to be a panacea for many engineering metals including magnesium alloys. However, bans and strict application regulations attributed to environmental concerns and the carcinogenic nature of hexavalent chromium have driven a considerable amount of effort into developing safer and more environmentally friendly alternative techniques that provide the desired corrosion protection performance for magnesium and its alloys. Part I of this review series considers the various pre-treatment methods as the earliest step involved in the preparation of Mg surfaces for the purpose of further anti-corrosion treatments. The decisive effect of pre-treatment on the corrosion properties of both bare and coated magnesium is discussed. The second section of this review covers the fundamentals and performance of conventional and state-of-the-art conversion coating formulations including phosphate-based, rare-earth-based, vanadate, fluoride-based, and LDH. In addition, the advantages and challenges of each conversion coating formulation are discussed to accommodate the perspectives on their application and future development. Several auspicious corrosion protection performances have been reported as the outcome of extensive ongoing research dedicated to the development of conversion coatings, which can potentially replace hazardous chromium(VI)-based technologies in industries.

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Section: Conversion Coatingsmentioning

confidence: 99%

Section: Conversion Coatingsmentioning

confidence: 99%

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

et al. 2022

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“…This can be explained by the high stability constant of the magnesium complex with DTPA. Calculation of thermodynamic equilibrium composition in the treatment bath for parental LDH growth was already performed in our previous work . On the one hand, this results in the release of Mg 2+ cations into the electrolyte, where they can react with available cations of aluminum and its compounds from the treatment bath and precipitate in the form of MgAl LDH on the surface (Figure b).…”

Section: Resultsmentioning

confidence: 99%

“…LDH synthesis on the surface of magnesium alloy AZ91 was performed using the method previously described in ref 46. Briefly, 0.1 M aqueous solution of DTPA pentasodium salt with addition of Al(NO 3 ) 3 (0.05 M) and NaNO 3 (0.25 M) was prepared.…”

Section: Synthesis Of Parental Ldh (Ldh-oh/co 3 )mentioning

confidence: 99%

“…However, NTA belongs to carcinogenic substances − and its application should be prevented whenever possible. Therefore, the possibility to use more environmentally friendly compounds was investigated and diethylenetriaminepentaacetic (DTPA) and ethylenediaminetetraacetic (EDTA) acids were suggested as suitable chelating agents for LDH growth on the magnesium surface. However, during the LDH-OH/CO 3 synthesis in the presence of DTPA as a chelating agent, the enrichment of the interface underneath the LDH layers with metallic zinc was demonstrated .…”

Section: Introductionmentioning

confidence: 99%

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Corrosion Inhibitors Intercalated into Layered Double Hydroxides Prepared In Situ on AZ91 Magnesium Alloys: Structure and Protection Ability

Shulha

Serdechnova

Lamaka

et al. 2023

ACS Appl. Mater. Interfaces

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This work first describes the intercalation of corrosion inhibitors into layered double hydroxides LDH-OH/CO 3 nanocontainers (parental LDH) obtained in situ on the surface of magnesium alloy AZ91 in the presence of a chelating agent. Vanadate, as a typical broad inhibitor for active metals, and oxalate, as an inhibitor suitable for magnesium, were selected as a first approach. The optimization of exchange conditions was performed, and the optimal parameters (ambient pressure and 95 °C) were selected. The corrosion protective properties of obtained LDH-based layers were studied using immersion and salt spray tests in NaCl solution, supported by electrochemical impedance spectroscopy and atomic emission spectroelectrochemistry. It is demonstrated that vanadate intercalated into LDH is more effective for the active protection of AZ91 in comparison to the performance of oxalate. A possible mechanism of corrosion inhibition based on the application of LDH nanocontainers is suggested and discussed.

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Synergistic effects of Pt single atomic site and Cu nanoclusters for catalytic oxidation of methyl mercaptan

Ma,

Kang,

Wen

et al. 2024

Applied Surface Science

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In situ formation of LDH-based nanocontainers on the surface of AZ91 magnesium alloy and detailed investigation of their crystal structure

Cited by 30 publications

References 72 publications

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

Corrosion Inhibitors Intercalated into Layered Double Hydroxides Prepared In Situ on AZ91 Magnesium Alloys: Structure and Protection Ability

Synergistic effects of Pt single atomic site and Cu nanoclusters for catalytic oxidation of methyl mercaptan

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