Effect of fluorozirconic acid on anodizing of aluminium and AA 2024-T3 alloy in sulphuric and tartaric-sulphuric acids

Elaish, R.; Curioni, Michele; Gowers, K. R.; Kasuga, Atsushi; Habazaki, H.; Hashimoto, Teruo; Skeldon, P.

doi:10.1016/j.surfcoat.2018.02.096

Cited by 21 publications

(12 citation statements)

References 54 publications

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“…Their thickness is limited to several hundreds of nanometers by the initiation of dielectric breakdown [34] and is directly proportional to the applied voltage. On the other hand, nanoporous oxides are formed in the acidic electrolytes, which promote oxide dissolution, such as sulfuric [35][36][37], oxalic [37,38], phosphoric [37,39], selenic [40,41], malonic [42], malic [43], phosphonic [44], citric [45,46], tartaric [47,48], etidronic [49,50], glutaric [51], and phosphonoacetic acid [52]. During the porous alumina formation, the current density stays almost constant under the potentiostatic condition because of the constant thickness of the barrier layer at the base of the pores.…”

Section: Types Of Anodic Alumina Filmsmentioning

confidence: 99%

Recent Progress in the Fabrication and Optical Properties of Nanoporous Anodic Alumina

et al. 2022

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The fabrication of a thick oxide layer onto an aluminum surface via anodization has been a subject of intense research activity for more than a century, largely due to protective and decorative applications. The capability to create well-defined pores via a cost-effective electrochemical oxidation technique onto the surface has made a major renaissance in the field, as the porous surfaces exhibit remarkably different properties compared to a bulk oxide layer. Amongst the various nanoporous structures being investigated, nanoporous anodic alumina (NAA) with well-organized and highly ordered hexagonal honeycomb-like pores has emerged as the most popular nanomaterial due to its wide range of applications, ranging from corrosion resistance to bacterial repelling surfaces. As compared to conventional nanostructure fabrication, the electrochemical anodization route of NAA with well-controlled pore parameters offers an economical route for fabricating nanoscale materials. The review comprehensively reflects the progress made in the fabrication route of NAA to obtain the material with desired pore properties, with a special emphasis on self-organization and pore growth kinetics. Detailed accounts of the various conditions that can play an important role in pore growth kinetics and pore parameters are presented. Further, recent developments in the field of controlling optical properties of NAA are discussed. A critical outlook on the future trends of the fabrication of NAA and its optical properties on the emerging nanomaterials, sensors, and devices are also outlined.

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Section: Types Of Anodic Alumina Filmsmentioning

confidence: 99%

Recent Progress in the Fabrication and Optical Properties of Nanoporous Anodic Alumina

et al. 2022

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“…The polished substrates were thoroughly rinsed with distilled water for 2 min. Thereafter, a two-step anodization process was used (Zaraska et al, 2010;Elaish et al, 2018). The pretreated samples were anodized in an electrochemical cell at 32 V (vs. saturated calomel electrode) in 0.3 M H 2 SO 4 for 1 h, with aluminum alloy as the anode and graphite as the cathode.…”

Section: Materials and Coating Preparationmentioning

confidence: 99%

Active Corrosion Protection by Epoxy Coating on Li2CO3-Pretreated Anodized Aluminum Alloy 2024-T3

et al. 2022

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The fast leaching and robust barrier property of inhibitors are the basic fundamentals for the formation of active protective coatings to protect aluminum alloys. Herein, an active protective surface was developed based on an epoxy coating and an underlying lithium carbonate (Li2CO3)-treated anodized aluminum alloy 2024-T3. The morphology of the Li-LDH layer was studied to know its formation mechanism. The electrochemical studies revealed that the fast and adequate leaching of lithium led to a substantial increment of corrosion resistance of the scratched coating in 3.5 wt% NaCl from 1 to 8 days. Time of flight secondary ion mass spectroscopy (ToF-SIMS) results indicated that Li was distributed in the lateral direction and covered the scratched area. The 3D images indicated that different lithium compounds were formed and 90% of the scratched area was covered with the lithium protective layer over immersion time. A combined approach of morphology observations, electrochemical measurements, and ToF-SIMS showed the lithium protective layer offered good corrosion resistance. On the contrary, lithium provided fast and adequate leaching from the coating, demonstrating good active protection for aluminum and its alloys.

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“…While most organic acids form barrier anodic oxide layers when used as sole anodizing electrolytes, porous anodic oxide layers are formed when they are combined with sulfuric acid [34]. The addition of organic acids to sulfuric acid electrolytes has been studied for different purposes [15,[31][32][33][34]45,83,[124][125][126][127]. In particular, Vignoli et al [34] studied the influence that adding different carboxylic acids to sulfuric acid has on the morphology, composition, and corrosion behavior of anodic oxide films on AA2024 alloy and compared their performance to CAA oxide films.…”

Section: Substitution Of the Chromic Acid Anodizing Processmentioning

confidence: 99%

A Review on Anodizing of Aerospace Aluminum Alloys for Corrosion Protection

et al. 2020

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Aluminum alloys used for aerospace applications provide good strength to weight ratio at a reasonable cost but exhibit only limited corrosion resistance. Therefore, a durable and effective corrosion protection system is required to fulfil structural integrity. Typically, an aerospace corrosion protection system consists of a multi-layered scheme employing an anodic oxide with good barrier properties and a porous surface, a corrosion inhibited organic primer, and an organic topcoat. The present review covers published research on the anodic oxide protection layer principles and requirements for aerospace application, the effect of the anodizing process parameters, as well as the importance of process steps taking place before and after anodizing. Moreover, the challenges of chromic acid anodizing (CAA) substitution are discussed and tartaric-sulfuric acid anodizing (TSA) is especially highlighted among the environmentally friendly alternatives.

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Effect of fluorozirconic acid on anodizing of aluminium and AA 2024-T3 alloy in sulphuric and tartaric-sulphuric acids

Cited by 21 publications

References 54 publications

Recent Progress in the Fabrication and Optical Properties of Nanoporous Anodic Alumina

Recent Progress in the Fabrication and Optical Properties of Nanoporous Anodic Alumina

Active Corrosion Protection by Epoxy Coating on Li2CO3-Pretreated Anodized Aluminum Alloy 2024-T3

A Review on Anodizing of Aerospace Aluminum Alloys for Corrosion Protection

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