Layered double hydroxides (LDHs) as functional materials for the corrosion protection of aluminum alloys: A review

Bouali, Anissa C.; Serdechnova, Maria; Blawert, Carsten; Tedim, João; Ferreira, M. G. S.; Zheludkevich, Mikhail L.

doi:10.1016/j.apmt.2020.100857

Cited by 82 publications

(57 citation statements)

References 355 publications

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“…In this regard, the sealing of such structural defects by the inclusion of nano-particles to the electrolyte during PEO or by using the post-treatments by boiling water, organic compounds, and sol-gel films have been proposed by several research groups [ 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 ]. Similar to the anodized samples, the successful formation of the LDHs on the PEO-coated samples not only caused an effective sealing of the structural defects but also released the corrosion inhibitors, providing the function of self-healing properties [ 19 , 43 , 78 , 79 , 80 , 81 , 82 , 83 ].…”

Section: Corrosion Performance Of Ldh/anodic Film Compositesmentioning

confidence: 99%

“…In addition to the approaches described above, layered double hydroxides (LDHs) can provide another approach to improve the protective properties by increasing the barrier properties [ 16 , 17 , 18 , 19 , 20 , 21 ]. LDHs are lamellar crystals with positively charged brucite-like host layers with interlayer regions containing charge-compensating anions and solvation molecules [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

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A Review on LDH-Smart Functionalization of Anodic Films of Mg Alloys

Kaseem

Ramachandraiah

Hossain³

et al. 2021

Nanomaterials

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This review presents an overview of the recent developments in the synthesis of layered double hydroxide (LDH) on the anodized films of Mg alloys prepared by either conventional anodizing or plasma electrolytic oxidation (PEO) and the applications of the formed composite ceramics as smart chloride traps in corrosive environments. In this work, the main fabrication approaches including co-precipitation, in situ hydrothermal, and an anion exchange reaction are outlined. The unique structure of LDH nanocontainers enables them to intercalate several corrosion inhibitors and release them when required under the action of corrosion-relevant triggers. The influences of different variables, such as type of cations, the concentration of salts, pH, and temperature, immersion time during the formation of LDH/anodic film composites, on the electrochemical response are also highlighted. The correlation between the dissolution rate of PEO coating and the growth rate of the LDH film was discussed. The challenges and future development strategies of LDH/anodic films are also highlighted in terms of industrial applications of these materials.

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Section: Corrosion Performance Of Ldh/anodic Film Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Review on LDH-Smart Functionalization of Anodic Films of Mg Alloys

Kaseem

Ramachandraiah

Hossain³

et al. 2021

Nanomaterials

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“…Great efforts have been made in order to look for alternatives to CrCC [12]. The great number of possibilities includes conversion coatings based on trivalent chromium [13], rare earths chemical conversion coatings [14,15], Zr/Ti-based chemical conversion coatings [16], sol-gel coatings [17], and smart coatings providing selfhealing protection [12,18,19]. However, none of these options has achieved a true industrial application capable of replacing CrCC and the scientific community continues to search for an alternative.…”

Section: Introductionmentioning

confidence: 99%

Application of Commercial Surface Pretreatments on the Formation of Cerium Conversion Coating (CeCC) over High-Strength Aluminum Alloys 2024-T3 and 7075-T6

Alba-Galvín

González-Rovira

Pedemonte

et al. 2021

Metals

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The selection of appropriate surface pretreatments is one of the pending issues for the industrial application of cerium-based chemical conversion coatings (CeCC) as an alternative for toxic chromate conversion coating (CrCC). A two-step surface pretreatment based on commercial products has been successfully used here to obtain CeCC on AA2024-T3 and AA7075-T6. Specimens processed for 1 to 15 min in solutions containing CeCl3 and H2O2 have been studied by scanning electron microscopy coupled with energy-dispersive X-ray analysis (SEM-EDX), glow discharge optical emission spectroscopy (GDOES), potentiodynamic linear polarization (LP), electrochemical impedance spectroscopy (EIS), and neutral salt spray (NSS) tests. SEM-EDX showed that CeCC was firstly observed as deposits, followed by a general coverage of the surface with the formation of cracks where the coating was getting thicker. GDOES confirmed an increase of the CeCC thickness as the deposition proceed, the formation of CeCC over 7075 being faster than over 2024. There was a Ce-rich layer in both alloys and an aluminum oxide/hydroxide layer on 7075 between the upper Ce-rich layer and the aluminum matrix. According to LP and EIS, CeCC in all samples offered cathodic protection and comparable degradation in chloride-containing media. Finally, the NSS test corroborated the anti-corrosion properties of the CeCC obtained after the commercial pretreatments employed.

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“…In recent years, layered double hydroxide (LDH)-based coating systems have been thoroughly investigated to substitute the traditional chromate coating systems in order to protect aluminum alloys [7,8]. LDHs are a class of synthetic anionic clays composed of positively charged metal hydroxide layers and interlayer anions.…”

Section: Introductionmentioning

confidence: 99%

Ce-Doped-MgAl Superhydrophobic Layered Double Hydroxide for Enhanced Corrosion Resistance Properties

Iqbal

Asghar

Fedel

2021

Solids

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Double doped layered double hydroxide thin films were developed directly on the aluminum substrate in two steps: Initially cerium-based MgAl-layered double hydroxide (LDH) were synthesized directly on the anodic aluminum surface via the in situ growth method, and were then modified with the stearate anions through an ion-exchange mechanism to achieve compact multifunctional protective thin films. The structural and morphological characteristics of the developed LDH films were investigated, and the surface contact angle measurements (CA) and self-cleaning properties were analyzed. The obtained double doped LDH film displayed the superhydrophobic characteristic with a water contact angle of ~155°. Furthermore, the superhydrophobic behavior of LDH on exposure to UV radiation (λ = 310 nm) was examined to evaluate outdoor applications. Long-term Electrochemical Impedance Spectroscopy (EIS) analysis was performed to understand the corrosion resistance properties. The introduction of double doped LDHs demonstrates significantly higher corrosion resistance properties than only cerium-modified LDHs and has shown superior stability against 0.1 M NaCl solution.

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Layered double hydroxides (LDHs) as functional materials for the corrosion protection of aluminum alloys: A review

Cited by 82 publications

References 355 publications

A Review on LDH-Smart Functionalization of Anodic Films of Mg Alloys

A Review on LDH-Smart Functionalization of Anodic Films of Mg Alloys

Application of Commercial Surface Pretreatments on the Formation of Cerium Conversion Coating (CeCC) over High-Strength Aluminum Alloys 2024-T3 and 7075-T6

Ce-Doped-MgAl Superhydrophobic Layered Double Hydroxide for Enhanced Corrosion Resistance Properties

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