Corrosion resistance of sol–gel alumina coated Mg metal in 3.5 % NaCl solution

Singh, Iqbal; Gupta, Prasanth; Maheshwari, Arpit; Agrawal, Naveen

doi:10.1007/s10971-014-3503-5

Cited by 17 publications

(3 citation statements)

References 45 publications

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“…Conversely, the cathodic reduction reaction shows a significant increase as the coating thickness increases, as can be observed from the decrease in the cathodic Tafel constant (except for AZAl200). This enhanced cathodic reaction may be the primary factor responsible for the improvement in corrosion resistance [57,58].…”

Section: Resultsmentioning

confidence: 99%

Corrosion inhibition capabilities of aluminium thin films on AZ31 magnesium alloy

Marndi

Pachaiappan

Amirthapandian

et al. 2023

Materials Science and Technology

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Al coating of varying thicknesses in the 50 to 200 nm range was coated on AZ31 Mg alloys to improve its corrosion capabilities. The thermal evaporation method is used for coating AZ31 Mg alloys. GIXRD, SEM, AFM and XEDS studied the structure, microstructure, and chemical analysis. GIXRD studies showed an amorphous thin film on the surface. AFM showed that the surface roughness increases with the coating thickness. Corrosion studies were done by electrochemical analysis in 3.5 wt-% NaCl environment. The Al coating has improved the corrosion resistance of the AZ31 alloy to the best with the lowest corrosion rate 0.07 mmpy, with the corrosion current density and corrosion potential of 0.32 × 10−5 A/cm2 and −1.17 V, respectively.

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Section: Resultsmentioning

confidence: 99%

Corrosion inhibition capabilities of aluminium thin films on AZ31 magnesium alloy

Marndi

Pachaiappan

Amirthapandian

et al. 2023

Materials Science and Technology

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“…Another strategy to enhance the corrosion resistance of Mg alloys is the use of inorganic or hybrid sol-gel coatings [32][33][34][35][36]. In this case, most papers report the densification of the coatings at temperatures lower or around 300 °C, to preserve the mechanical properties of the substrate.…”

Section: Aq1 Aq2mentioning

confidence: 99%

Control of degradation rate of Mg alloys using silica sol–gel coatings for biodegradable implant materials

Castro

Durán

2018

J Sol-Gel Sci Technol

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Silica sol-gel coatings were deposited on AZ31B and AZ91D magnesium substrates with the aim of controlling the degradation rate, corrosion attack and further dissolution of magnesium alloys for temporal implants. Two different silica sols were prepared with and without colloidal silica particles (MTL and TG sols) and deposited by dip-coating on both alloys. The coatings were characterised in SBF using three different in vitro tests; hydrogen evolution, pH variation and potentiodynamic polarization curves. The results show that the corrosion behaviour depends on the alloy and on the coating composition. Coatings on AZ91D-MTL were able to block the degradation of the alloy during 8 days of immersion in SBF, whereas coatings AZ91D-TG only maintain their stability during 3 days. Mg(OH) and hydroxyapatite (HAp) were identified as the compounds precipitated on AZ31B samples, not appearing on AZ91D samples. The electrochemical tests confirm the promising corrosion results obtained for coated AZ91D samples. Suitable silica sol-gel coatings were deposited on Mg alloys showing a great 1✉ 1 1 2 e.Proofing http://eproofing.springer.com/journals_v2/printpage.php?token=r8pcD... 1 de 30 25/09/2018 16:46 Highlights• Silica sol-gel coatings are able to block the degradation and corrosion attack of Mg alloys.• Different corrosion processes were identified that depend on the alloy and composition of the coatings.• Mg(OH) and HAp precipitate onto the alloys, promoting the osteointegration.

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“…Amorphous alumina, unlike crystalline polymorphs, has a disordered, noncrystalline structure, and exhibits some attractive properties, such as high dielectric constant (Segda et al, 2001;Momida et al, 2006Momida et al, , 2007b, low band gap energy (Jennison et al, 2004;Adiga et al, 2006;Novikov et al, 2009;Lizárraga et al, 2011), and excellent mechanical and optical properties (Nayar et al, 2014;Paz et al, 2014;Orosco and Coimbra, 2018). Benefiting from these remarkable properties, amorphous alumina has been successfully used as insulators (Rashkeev et al, 2003;Katiyar et al, 2005;Avis and Jang, 2011), corrosion protection (Boisier et al, 2008;Singh et al, 2015;Daubert et al, 2017), capacitors (Blonkowski, 2007;Fukuhara et al, 2021), and catalysis (Yoon and Cocke, 1986;Nagaraju et al, 2002). Meanwhile, molten alumina has also attracted a lot of attention because of its utilization in producing large sapphire single crystals (Will et al, 1992;Golubović et al, 2001;Farr et al, 2013) and in the analysis of the behavior of aluminum-fueled rocket engine effluent (Jani et al, 2013;Skinner et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Structural, vibrational and transport properties of liquid and amorphous alumina: A molecular dynamics simulation study

Zhou

Zhou²,

Deng³

2022

Front. Mater.

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Structural, vibrational and transport properties of liquid alumina at 2500 K and amorphous alumina at 300 K were studied by molecular dynamics simulations using an empirical Born-Mayer-Huggins potential with the recently optimized parameters. The investigations were conducted for the predicted densities at almost zero pressure, as well as the experimentally reported densities of 2.81 g/cm3 and 3.175 g/cm3. A detailed examination of the interatomic correlations showed that for both liquid and amorphous alumina, the short-range order was dominated by the slightly distorted (AlO4)5− tetrahedra. Vibrational density of states (VDOS) was obtained from the Fourier transform of the velocity autocorrelation functions (VACF), which exhibited broader ranges for the liquid phases compared with those for the amorphous phases. Each VDOS spectrum was divided into two primary frequency bands for both liquid and amorphous alumina. Thermal conductivities (κ) and viscosities (η) were estimated respectively through the heat-current autocorrelation functions (HCACFs) and stress autocorrelation functions (SACF) by the equilibrium molecular dynamics (EMD) simulations using the Green-Kubo relation. And the results were shown to be consistent with the experimental data, especially that κ was equal to 2.341 ± 0.039 Wm−1K−1 for amorphous alumina at 2.81 g/cm3 and 300 K, η was equal to 0.0261 ± 0.0017 Pa·s and 0.0272 ± 0.0018 Pa·s for the liquid phases at 2500 K with densities of 2.81 g/cm3 and 2.863 g/cm3, respectively. Mean squared displacements (MSDs) were employed for the self-diffusion coefficients (D) estimation.

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Corrosion resistance of sol–gel alumina coated Mg metal in 3.5 % NaCl solution

Cited by 17 publications

References 45 publications

Corrosion inhibition capabilities of aluminium thin films on AZ31 magnesium alloy

Corrosion inhibition capabilities of aluminium thin films on AZ31 magnesium alloy

Control of degradation rate of Mg alloys using silica sol–gel coatings for biodegradable implant materials

Structural, vibrational and transport properties of liquid and amorphous alumina: A molecular dynamics simulation study

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