Active protective PEO coatings on AA2024: Role of voltage on in-situ LDH growth

Mohedano, M.; Serdechnova, Maria; Starykevich, M.; Карпушенков, С. А.; Bouali, Anissa C.; Ferreira, M.G.S.; Zheludkevich, Mikhail L.

doi:10.1016/j.matdes.2017.01.097

Cited by 101 publications

(49 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…sealing improved the corrosion resistance and vanadate-containing LDHs can effectively heal the defects, suppressing corrosion. They further investigated the effect of the voltage used to produce the PEO on the growth of LDHs, and found that coatings produced at higher voltages had a decreased number of LDH flakes on the surface of the PEO layers [18].…”

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

View full text Add to dashboard Cite

show abstract

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

View full text Add to dashboard Cite

show abstract

“…This is particularly evident in aluminate electrolyte-based PEO coating (A3.1), where the Al-Fe intermetallic compounds from the substrate are still visible in the coating (Figure 3a, inset) due to its low thickness. This coating is also more heterogeneous (Figure 3b) than the rest, which is attributable to its high breakdown voltage values ( Figure 2) [37,45,46] and, as mentioned before, its low coating growth rate. Phosphate electrolyte-based PEO coating (P2.1) showed a homogeneous (Figure 3c) surface appearance (Figure 3c), and the highest thickness value (Figure 3d).…”

Section: Peo Coating Screeningmentioning

confidence: 52%

“…The most dominant factor which determines the PEO/LDH system behavior is the interaction between the electrolyte anions and Al(OH) 2 + cations from PEO coating surface. This phenomenon has a major impact on the kinetic mechanism of the formation of LDH coating [37,38]. F. Chen [39] demonstrated that flakes were preferentially formed in the PEO pores at the initial stage of LDHs growth; it was also found that long-term corrosion resistance was significantly enhanced due to the limited penetration of corrosive ions [38].…”

Section: Introductionmentioning

confidence: 99%

LDH Post-Treatment of Flash PEO Coatings

et al. 2019

View full text Add to dashboard Cite

This work investigates environmentally friendly alternatives to toxic and carcinogenic Cr (VI)-based surface treatments for aluminium alloys. It is focused on multifunctional thin or flash plasma electrolytic oxidation (PEO)-layered double hydroxides (LDH) coatings. Three PEO coatings developed under a current-controlled mode based on aluminate, silicate and phosphate were selected from 31 processes (with different combinations of electrolytes, electrical conditions and time) according to corrosive behavior and energy consumption. In situ Zn-Al LDH was optimized in terms of chemical composition and exposure time on the bulk material, then applied to the selected PEO coatings. The structure, morphology and composition of PEO coatings with and without Zn-Al-LDH were characterized using XRD, SEM and EDS. Thicker and more porous PEO coatings revealed higher amounts of LDH flakes on their surfaces. The corrosive behavior of the coatings was studied by electrochemical impedance spectroscopy (EIS). The corrosion resistance was enhanced considerably after the PEO coatings formation in comparison with bulk material. Corrosion resistance was not affected after the LDH treatment, which can be considered as a first step in achieving active protection systems by posterior incorporation of green corrosion inhibitors.

show abstract

“…Inferior corrosion and wear resistance are the main issues that restrict the wide range of applications of Mg and its alloys [1][2][3][4]. Plasma electrolytic oxidation (PEO) is one of the promising surface treatment processes derived from conventional anodizing to produce ceramic-like coatings on light alloys (Al, Mg and Ti) with enhanced anti-corrosion properties, wear resistance and biological compatibility [5][6][7][8]. In the case of Mg alloys, aqueous alkaline electrolytes are usually used during the PEO process and coatings are formed by the localized dielectric breakdown of the oxide film at high voltage [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Influence of SiO2 Particles on the Corrosion and Wear Resistance of Plasma Electrolytic Oxidation-Coated AM50 Mg Alloy

Chen

Blawert

et al. 2018

Coatings

View full text Add to dashboard Cite

The influence of SiO2 particles on the microstructure, phase composition, corrosion and wear performance of plasma electrolytic oxidation (PEO) coatings on AM50 Mg was investigated. Different treatment durations were applied to fabricate coatings in an alkaline, phosphate-based electrolyte (1 g/L KOH + 20 g/L Na3PO4 + 5 g/L SiO2), aiming to control the incorporated amount of SiO2 particles in the layer. It was found that the uptake of particles was accompanied by the coating growth at the initial stage, while the particle content remained unchanged at the final stage, which is dissimilar to the evolution of the coating thickness. The incorporation mode of the particles and phase composition of the layer was not affected by the treatment duration under the voltage-control regime. The corrosion performance of the coating mainly depends on the barrier property of the inner layer, while wear resistance primarily relies on the coating thickness.

show abstract

Active protective PEO coatings on AA2024: Role of voltage on in-situ LDH growth

Cited by 101 publications

References 44 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

LDH Post-Treatment of Flash PEO Coatings

Influence of SiO2 Particles on the Corrosion and Wear Resistance of Plasma Electrolytic Oxidation-Coated AM50 Mg Alloy

Contact Info

Product

Resources

About