Layered double hydroxide based active corrosion protective sealing of plasma electrolytic oxidation/sol-gel composite coating on AA2024

Bouali, Anissa C.; Straumal, Elena A.; Serdechnova, Maria; Wieland, D. C. Florian; Starykevich, M.; Blawert, Carsten; Hammel, Jörg U.; Лермонтов, С. А.; Ferreira, M.G.S.; Zheludkevich, Mikhail L.

doi:10.1016/j.apsusc.2019.07.117

Cited by 55 publications

(16 citation statements)

References 40 publications

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“…However, when the native aluminium oxide containing surface defects that can lead to water adsorption (or absorption) is not sufficient against further corrosion in strong environments, the addition of other passivating agents is recommended [ 22 ]. Sol–gel and hydrophobic coatings are also being increasingly used as surface modifications to improve corrosion performance [ 47 , 48 , 49 ].…”

Section: Discussionmentioning

confidence: 99%

Surface Stoichiometry and Roughness of a Degraded A380 Alloy after Casting, Technical Cleaning and Packaging

Petrovič

Mandrino

2021

Materials

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The surface stoichiometry of the degraded surface of a commercial Al–Si casting was investigated. The die-cast component was previously stored in a sealed plastic envelope. After that, surface stains in the form of white layers were observed. X-ray photoelectron spectroscopy (XPS) was used to study these layers. For comparison, a seemingly unaffected area as well as a freshly cut surface of the casting were also analysed. In order to additionally assess the surface condition, surface roughnesses were measured. Based on the binding energies (BEs) of the Al and O in the XPS spectra, and the stoichiometric results, it was concluded that the surface layers of the degraded and undegraded samples consist mostly of aluminium oxide and aluminium hydroxide. Furthermore, sodium phosphate from the leftover detergent and silicon oxide were detected in both analysed areas. Analyses of the Al KLL Auger transition were used to corroborate this. The relative shares of Al oxide vs. hydroxide based on the elemental concentrations were determined. The chemical compositions and chemical states of the elements in the top layers were thus obtained. The combination of surface-sensitive analytical techniques was found to be a suitable tool for the ex-post identification of the source of defects.

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Section: Discussionmentioning

confidence: 99%

Surface Stoichiometry and Roughness of a Degraded A380 Alloy after Casting, Technical Cleaning and Packaging

Petrovič

Mandrino

2021

Materials

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“…But the formation of LDH growth in such cases depends upon the PEO tortuosity and the pores which are responsible for the accessibility of the Al(OH) − 4 [66]. Plasma electrolysis modification is found to develop highly stable in situ growth LDH structure and dense LDH geometry [66,67]. Meanwhile, the electrochemical deposition approach is another way to develop LDHs directly on the substrate with the advantage of controlled deposition rate and higher growth rate, but the synthetic procedure is complex and not completely discussed yet.…”

Section: In Situ Growth Methodsmentioning

confidence: 99%

Layered Double Hydroxide Protective Films Developed on Aluminum and Aluminum Alloys: Synthetic Methods and Anti-Corrosion Mechanisms

et al. 2020

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This work reviews the characteristics of layered double hydroxides (LDHs) in the context of protective thin films to enhance the corrosion resistance properties of aluminum alloys. A discussion is made in detail about the LDH protection mechanism and the effect of synthesis approaches on LDH structural variations and the corresponding anti-corrosion behavior. LDHs anion-exchange behavior to host inorganic/organic anions makes them a potential material to investigate for anti-corrosion film. This unique advantage and the availability of a wide range of metal oxide-based layers, interlayer anions, and self-healing properties make LDH family an attractive choice for the development of compact LDHs based smart coating systems.

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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%

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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Layered double hydroxide based active corrosion protective sealing of plasma electrolytic oxidation/sol-gel composite coating on AA2024

Cited by 55 publications

References 40 publications

Surface Stoichiometry and Roughness of a Degraded A380 Alloy after Casting, Technical Cleaning and Packaging

Surface Stoichiometry and Roughness of a Degraded A380 Alloy after Casting, Technical Cleaning and Packaging

Layered Double Hydroxide Protective Films Developed on Aluminum and Aluminum Alloys: Synthetic Methods and Anti-Corrosion Mechanisms

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

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