Environmentally friendly Zn–Al layered double hydroxide (LDH)-based sol–gel corrosion protection coatings on AA 2024-T3

Subasri, R.; Raju, K. R. C. Soma; Reddy, D. Sreekantha; Jyothirmayi, A.; Ijeri, Vijaykumar S.; Prakash, Om; Gaydos, Stephen

doi:10.1007/s11998-019-00229-y

Cited by 26 publications

(7 citation statements)

References 34 publications

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“…It is known that the inhibitory effect may be caused by the inhibition of anodic reaction, the inhibition of cathodic reaction and inhibition of both responses (Galvão et al, 2016;Alibakhshi et al, 2016;Poznyak et al, 2009;Alibakhshi et al, 2017;Tedim et al, 2012;Yabuki and Sakai, 2011;Subasri et al, 2019). It is interesting to compare the composition of the pigment with its anti-corrosive effect, as well as to take into account the effect of the nature of the cations and anions on the corrosion rate.…”

Section: Resultsmentioning

confidence: 99%

Investigation of color and anticorrosive properties of pigments in the Fe-Al-Mg-O-H system by the simplex lattice method

Frolovа

Butyrina

2020

PRT

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Purpose The purpose of this paper is to study the patterns of formation of anti-corrosion properties, the development of compositions for pigments by using the method of co-precipitation and subsequent heat treatment. Design/methodology/approach To obtain co-precipitated hydroxides, aqueous solutions of salts were used. The conditions of synthesis varied according to the following parameters: the nature of the starting salts of metals; and the ratio of metal cations. The anticorrosive activity of the pigments was evaluated by the potentiodynamic method, by comparing the anodic and cathodic polarization curves, and calculated potentials and corrosion currents on the basis of regions of Tafel on curves. Polarization curves were obtained by using Potentiostat/Galvanostat/ZRA Gamry, which connected to the PC, and by using the program Gamry Framework. The measurement results were processed by using the method of simplex-lattice planning. X-ray diffractograms of pigments were recorded on a DRON – 2.0 diffractometer (monochromatic copper radiation with a nickel filter). Findings The paper deals with the results of research the dependence of colour characteristics and anticorrosion properties of synthesized compositions on their nature and composition. The presence of aluminium cations leads to the formation of solid solutions of ferrum and aluminium oxyhydroxides. Originality/value The main technological properties of pigments are determined by the anionic and cationic composition. Colour characteristics are determined by the cation-chromophore. The anti-corrosive properties of non-calcined pigments are determined to a greater extent by the presence of the formed hydroxyl ions and the composition of the compounds. The greatest protective effect is observed when using double compounds of metals, the dissociation constants of which differ significantly. The protective effect is mainly determined by the slowdown of the anode process. Anions containing aluminium atoms accelerate the corrosion processes.

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Section: Resultsmentioning

confidence: 99%

Investigation of color and anticorrosive properties of pigments in the Fe-Al-Mg-O-H system by the simplex lattice method

Frolovа

Butyrina

2020

PRT

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“…During immersion, the release of Ce 3+ cations after LDH dissolution provides active protection of the alloy substrate and self-healing from localized corrosion attack by Ce atom. Similarly, Subasri R et al [87] developed a ZnAl-LDH intercalated with different inhibitors (8HQ, MBZ, PA, MoO 4 , and VO 4 ) and investigated their corrosive resistance properties on AA2423-T3 alloy in 3.5 wt% NaCl. It was found that different inhibitors improve the overall corrosive resistance performance.…”

Section: Hybrid Sol-gel Coating For the Corrosive Resistance Of Al Al...mentioning

confidence: 99%

Sol-Gel Materials for Electrochemical Applications: Recent Advances

2022

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This review article emphases on the modern approaches to the types of sol-gel materials that are beneficial for electrochemistry, monitored by a report of recent advances in the numerous fields of sol-gel electrochemistry. Modified electrodes for sensors and supercapacitors as well as anti-corrosion are described. Sol-gel synthesis expands the capabilities of technologists to obtain highly porous, homogeneous, and hybrid thin-film materials for supercapacitor electrode application. The widespread materials are transition metal oxides, but due to their low conductivity, they greatly impede the rate capability of electrochemical supercapacitors. The way to optimize their properties is the production of complex oxides or different composites. Among the new materials, a special place is occupied by perovskites and materials with an olivine-type structure, which can be easily obtained by the sol-gel method. The sol-gel coating process has demonstrated excellent chemical stability to advance the corrosion resistance of the various metal alloy substrates. Furthermore, the sol-gel process is a user-friendly technique for applying a hybrid sol-gel coating to provide corrosion resistance. The hybrid sol-gel coating technique is the most attractive, easy to prepare at a lower temperature, and has shown the potential to swap Cr-based coatings. The hybrid sol-gel coating has exhibited promising properties of adherent and uses chemically inert to enhance the corrosion resistance of the metal and alloys. Hence, this review article emphases on the recent advances and approaches in the sol-gel coating processes that influence the belongings of its hybrid sol-gel coating for protecting metal substrates and their alloys from corrosion. In addition, the author discusses the current problem and challenges of hybrid anti-corrosion sol-gel coatings. Metal oxides and composites based on them are actively used to create electrochemical sensors. They synthesized, including the anhydrous and citrate sol-gel methods. Such materials are widely used as glucose biosensors and harmful gas sensors.

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“…A delay was found in the penetration of aggressive ions inside the composite coating which in turn provided longer protection. Subasri et al [91] reported a comparative study of the utilization of various corrosion inhibitors in different proportions for instance, vanadate group, 2-mercapto benzothiazole, 8-hydroxyquinoline, phytic acid intercalated LDH and studied the effect of resultant dispersion in the sol-gel matrix to investigate the compactness and corrosion resistance properties of LDH to protect the AA2024 substrate. After 120 h salt spray exposure to 3.5% NaCl solution, ZnAl-LDH with corrosion inhibitors of phytic acid and 8-hydroxyquinoline were seen to show the lowest corrosion current densities.…”

Section: Corrosion Resistance Co-precipitated Ldhs In Organic and Hybmentioning

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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Environmentally friendly Zn–Al layered double hydroxide (LDH)-based sol–gel corrosion protection coatings on AA 2024-T3

Cited by 26 publications

References 34 publications

Investigation of color and anticorrosive properties of pigments in the Fe-Al-Mg-O-H system by the simplex lattice method

Investigation of color and anticorrosive properties of pigments in the Fe-Al-Mg-O-H system by the simplex lattice method

Sol-Gel Materials for Electrochemical Applications: Recent Advances

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

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