Recent Trends of the Use of Rare Earth Elements for Efficient Environmentally Compliant Corrosion Protection of Aluminum and Its Alloys

Kozhukharov, S.; Girginov, Christian

doi:10.1007/978-94-024-2018-0_35

Cited by 6 publications

(5 citation statements)

References 36 publications

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“…Consequently, CeCC formation initiates from nobler intermetallic inclusions, sealing them completely, and subsequently spreading over the remaining surface. Thus, CeCC growth undergoes a transformation in the formation mechanism from islandlike nucleation to subsequent layer formation [96], as illustrated in Figure 3.…”

Section: Application Of Cerium Oxide and Soluble Salts-based Material...mentioning

confidence: 99%

“…Recent evidence suggests that the optimal concentration of the Ce-precursor should range between 0.03 and 0.05 mol dm À3 [98,99], and the maximum amount of added 30% H 2 O 2 as a deposition activator should be around 10 ml for up to 1000 ml of precursor solution. Experiences thus far indicate that the deposition of these coating layers can be accomplished through dipcoating [96,97], electrodeposition under galvanostatic [46] or potentiostatic [100,101] regimes. In all cases, CeCC formation requires activation energy in the form of elevated temperatures (up to 60°C to avoid considerable thermal H 2 O 2 decomposition), applied potential (up to À1 V) vs. Ag/AgCl reference electrode, or defined current density (from À2toÀ5mAcm À2 ).…”

Section: Application Of Cerium Oxide and Soluble Salts-based Material...mentioning

confidence: 99%

“…Furthermore, the oxidation of Ce 3+ ions to Ce(IV)-oxides and hydroxides could be further enhanced under conditions of electrochemical deposition, following reaction (13): 6) Initial Ceoxide/hydroxide deposits [96].…”

Section: Application Of Cerium Oxide and Soluble Salts-based Material...mentioning

confidence: 99%

“…Figure 3. Illustration of CeCC layer on Cu-doped Al alloy: (1) Grain boundaries; (2) Grains of the basic Aluminum matrix; (3) Cathodic copper intermetallic inclusions; (4) Native oxide layer; (5) CeCC layer; (6) Initial Ceoxide/hydroxide deposits[96].…”

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confidence: 99%

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Innovative Applications of Cerium Oxide-Based Materials in Civil Engineering, Automation, and Energy Sectors

Kozhukharov,

Girginov,

Lilova

et al. 2024

Cerium - Chemistry, Technology, Geology, Soil Science and Economics

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Cerium oxide materials exhibit remarkable properties, positioning them as highly effective, environmentally friendly solutions across diverse applications. This chapter provides a comprehensive overview of fundamental concepts and technological methodologies related to cerium oxide (CeO2) and doped ceria-based materials. Emphasis is placed on electrochemical deposition, spray pyrolysis, and the sol-gel approach for synthesizing thin and thick layers of ceria. The versatility of these materials is explored, spanning from corrosion protection layers and specialized ceramic elements for sensor applications to components for solid oxide fuel cells (SOFCs) and electrodes for water-splitting cells. Additionally, the chapter delves into the promising applications of recently developed ceria-based nanomaterials in various fields, marking some advanced methods for CeO2-based materials synthesis. The key findings are succinctly summarized in the concluding section.

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Section: Application Of Cerium Oxide and Soluble Salts-based Material...mentioning

confidence: 99%

Section: Application Of Cerium Oxide and Soluble Salts-based Material...mentioning

confidence: 99%

Section: Application Of Cerium Oxide and Soluble Salts-based Material...mentioning

confidence: 99%

mentioning

confidence: 99%

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Innovative Applications of Cerium Oxide-Based Materials in Civil Engineering, Automation, and Energy Sectors

Kozhukharov,

Girginov,

Lilova

et al. 2024

Cerium - Chemistry, Technology, Geology, Soil Science and Economics

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“…However, they have the main drawback: they are toxic and harmful to the environment and humans [8]. Due to these toxicity issues, replacement is possible using natural organic compounds such as seeds [9,10], plants and leaf extracts [11], nontoxic synthetic compounds (colorants) [12], rare earth elements [13], and organic compounds [14]. These alternatives are cost-effective, harmless, innocuous, easily obtainable, and environmentally friendly and are required as a green corrosion inhibitor.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical evaluation of mucilage and cochineal pigments as a hybrid film coating on aluminum surfaces

López¹,

Sánchez²,

Guerrero-Serrano³

et al. 2022

Mater. Res. Express

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This work deals with the electrochemical evaluation of a hybrid coating based on mucilage and prickly pear cochineal (Dactylopius coccus) for corrosion protective applications. The Opuntia streptacantha mucilage was extracted by grinding prickly pear cochineal, and three coatings containing mucilague (CM), cochineal-mucilage (CMC), and cochineal-mucilage without Tween 80 (CMC-T) were formulated. The aluminum working electrodes (WE) were coated by immersion and then left to dry for 72 hours at room temperature. The formed coats were assessed by electrochemical impedance spectroscopy, electrochemical noise, and potentiodynamic polarization curves after 24, 72, and 168 hours of immersion in a 3.5 wt% NaCl solution. These electrochemical measurements were performed in triplicate to check reproducibility. The Tween 80 plasticizer-free cochineal-mucilage-based hybrid coating reveals more excellent protection against corrosion than uncoated aluminum. Optical micrographs were used to set apart the conditions of the hybrid coating after its valuation, which show the protection of the metallic surface on which it was not coated. Results showed that the hybrid coating has suitable properties as a barrier against corrosion due to its ability to block the aggressive species diffusion by trapping them in the coating structure, which prevents their contact with the metal surface. This property is attributable to better mucilage and cochineal film homogeneity. Also, it acts as a corrosion inhibitor due to its semi-permeable behavior where only water molecules flow through its pores. This hybrid coating showed an excellent corrosion-resistant behavior to be used to protect aluminum.

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Selection of appropriate electrochemical deposition regime for cerium conversion coating on anodized AA2024-T3 aircraft alloy

Girginov,

Portolesi,

Kozhukharov

et al. 2024

J Appl Electrochem

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Recent Trends of the Use of Rare Earth Elements for Efficient Environmentally Compliant Corrosion Protection of Aluminum and Its Alloys

Cited by 6 publications

References 36 publications

Innovative Applications of Cerium Oxide-Based Materials in Civil Engineering, Automation, and Energy Sectors

Innovative Applications of Cerium Oxide-Based Materials in Civil Engineering, Automation, and Energy Sectors

Electrochemical evaluation of mucilage and cochineal pigments as a hybrid film coating on aluminum surfaces

Selection of appropriate electrochemical deposition regime for cerium conversion coating on anodized AA2024-T3 aircraft alloy

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