Fabrication and characterization of Mg-M layered double hydroxide films on anodized magnesium alloy AZ31

Wu, Liang; Yang, Danni; Zhang, Gen; Zhang, Zhi; Zhang, Sheng; Tang, Aitao; Pan, Fusheng

doi:10.1016/j.apsusc.2017.06.244

Cited by 168 publications

(36 citation statements)

References 33 publications

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“…produced the diffraction peaks characteristic of LDHs, corresponding to the 003 and 006 planes [26]. The intensity of the (00l) reflection family (l = 3 and 6) had contributions by diffraction from both the LDH host layers containing Mg or Al cations coordinated octahedrally by hydroxyl groups and the interlayer anions [27].…”

Section: Resultsmentioning

confidence: 99%

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Active corrosion protection by a smart coating based on a MgAl-layered double hydroxide on a cerium-modified plasma electrolytic oxidation coating on Mg alloy AZ31

et al. 2018

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Section: Resultsmentioning

confidence: 99%

“…Furthermore, layered double hydroxides (LDHs) have been widely investigated as nanocarriers because of their excellent ion-exchange capability [9][10][11][12][13]. Tedim et al [14] found that LDHs nitrate produced effective chloride nanotraps, and were sensitive to the chloride concentration in the bulk solution.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Active corrosion protection by a smart coating based on a MgAl-layered double hydroxide on a cerium-modified plasma electrolytic oxidation coating on Mg alloy AZ31

et al. 2018

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“…However, for its poor corrosion resistance, magnesium alloy, particularly as the magnesium alloy parts for outdoor applications, is confronted with great challenges [4][5][6][7]. Many literatures have verified that the surface modification technique, such as chemical conversion coatings, anodic oxidation, micro arc oxidation (MAO), organic coatings, vapor phase processes, etc, is an effective way to change the surface composition and improve its corrosion resistance of magnesium alloy [8][9][10][11][12]. MAO is a newly developed technology for the preparation of ceramic coatings on aluminum, magnesium or titanium alloys to improve the corrosion resistance [10,[13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Corrosion Behavior in Marine Environment of MAO Coatings on Magnesium Alloy

et al. 2020

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To improve the corrosion performance of magnesium alloys in the marine environment, the MAO, MAO–Cu2CO3(OH)2·H2O and MAO–Cu2P2O7 ceramic coatings were deposited on AZ91D magnesium alloys in basic electrolyte and the discoloration mechanism of the Cu-doped MAO coatings and the corrosion behavior of the three MAO coatings in the artificial seawater solution were investigated by SEM, EDS and XPS. The results indicated that the formation and discoloration mechanism of the brown MAO ceramic coatings were attributable to the formation of Cu2O in the coatings. Though the three MAO coatings had a certain protective effect against the corrosion of AZ91D substrate in the artificial seawater, the distinctive stratification phenomenon was found on the MAO–Cu2P2O7 coated sample and the corrosion model of the MAO–Cu2P2O7 coatings in the immersion experiment was established. Therefore, the brown Cu-doped MAO coatings were speculated to significantly reduce the risk of the magnesium parts in marine environments.

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“…The first works on the growth of LDHs available in the literature aimed at obtaining a smooth uniform layer of LDHs, imparting only one type of modification to protect the substrate, typically based on "barrier" [9] or superhydrophobicity effects [10][11][12][13]. A more recent trend relies on the use of LDHs as sealing of anodized layers [14][15][16] to impart additional active corrosion protection.…”

Section: Introductionmentioning

confidence: 99%

Layered Double Hydroxide Clusters as Precursors of Novel Multifunctional Layers: A Bottom-Up Approach

et al. 2019

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The specific microstructure of aluminum alloys is herein explored to grow spatially-resolved layered double hydroxide (SR-LDH) clusters on their surface. Upon chemical modification of LDHs via intercalation, adsorption and grafting with different functional molecules, novel surface-engineered surfaces were obtained. Crystal structure and phase composition were analyzed by X-ray diffraction (XRD) and surface morphology was observed by scanning electron microscopy (SEM). X-ray photoelectron spectroscopy (XPS) and glow discharge optical emission spectrometry (GDOES) were used to correlate structural changes upon ion-exchange and interfacial modifications with chemical composition and surface profiles of the SR-LDH films, respectively. The protection conferred by these films against localized corrosion was investigated at microscale using the scanning vibrating electrode technique (SVET). LDH-NO3 phase was obtained by direct growth onto AA2024 surface, as evidenced by (003) and (006) XRD diffraction reflections. After anion exchange of nitrate with 2-mercaptobenzothiazole (MBT) there was a decrease in the SR-LDH thickness inferred from GDOES profiles. The subsequent surface functionalization with HTMS was confirmed by the presence of Si signal in XPS and GDOES analyses, leading to an increase in the water contact angle (c.a 144° ± 3°). SVET measurements of the SR-LDH films revealed exceptional corrosion resistance, whereas the bioluminescent bacteria assay proved the anti-microbial character of the obtained films. Overall the results obtained show an effective corrosion protection of the SR-LDHs when compared to the bare substrate and the potential of these films for biofouling applications as new Cr-free pre-treatments.

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Fabrication and characterization of Mg-M layered double hydroxide films on anodized magnesium alloy AZ31

Cited by 168 publications

References 33 publications

Active corrosion protection by a smart coating based on a MgAl-layered double hydroxide on a cerium-modified plasma electrolytic oxidation coating on Mg alloy AZ31

Active corrosion protection by a smart coating based on a MgAl-layered double hydroxide on a cerium-modified plasma electrolytic oxidation coating on Mg alloy AZ31

Preparation and Corrosion Behavior in Marine Environment of MAO Coatings on Magnesium Alloy

Layered Double Hydroxide Clusters as Precursors of Novel Multifunctional Layers: A Bottom-Up Approach

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