Anti-corrosive properties of silane coatings deposited on anodised aluminium

Wojciechowski, Jarosław; Szubert, Karol; Peipmann, Ralf; Fritz, Mathias; Schmidt, Udo; Bund, Andreas; Lota, Grzegorz

doi:10.1016/j.electacta.2016.10.080

Cited by 53 publications

(31 citation statements)

References 39 publications

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“…[7][8][9][10][11] The application of organic compounds in the rolling eld has been extensively researched and reported. 4,12,13 Organic compounds consisting of heteroatoms, such as O, N, P, or S and multiple bonds or aromatic rings, possess good adsorption performance. Electron enrichment sites on molecules promote the adsorption on the metal surface.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and adsorption behaviors of thiadiazole derivatives on the aluminum surface

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Electrochemical and adsorption behaviors of thiadiazole derivatives on the aluminum surface

et al. 2019

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“…Considering the anodized foams (sealed and unsealed), two different time constants can be observed in the middle-high frequency range. According to previous studies, 25,26 the relaxation process at about 10 2 to 10 3 Hz can be attributed to the porous/cracked anodized layer while the relaxation process at about 10 0 to 10 1 Hz to the overlapping contribution of the barrier aluminium oxide and the faradic process.…”

Section: Acetic Salt Spray Testmentioning

confidence: 73%

“…Considering the impedance diagram of the not-anodized foam, it is possible to observe a single relaxation process in the middle frequency range. According to the literature, [25][26][27] it can be related to the overlapping contribution of the natural aluminium oxide and the faradic process. Considering the anodized foams (sealed and unsealed), two different time constants can be observed in the middle-high frequency range.…”

Section: Acetic Salt Spray Testmentioning

confidence: 99%

Study of anodizing process on aluminium foam to improve the corrosion behavior

Rossi

Bizzotto

Deflorian

et al. 2019

Surface & Interface Analysis

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Aluminium foam is obtained by the production of air into metallic melt. This material shows a very low density together with good mechanical properties, high impact energy absorption, and fire resistance. Different production ways to obtain metallic foam are possible. Considering the cost, the Alporas process is particularly interesting. By means of this production method, a block of metallic foam with close cells is obtained. By slicing, foam panels are obtained. The mechanical cut promotes the formation of an open cells texture on the surface. In this last case, the complex morphology of aluminium foam could be a critical point considering the corrosion behavior in aggressive environments, where localized corrosion phenomena, as pitting or crevice corrosion, are likely to occur. The anodizing treatment is one of the most used methods to improve the corrosion resistance of aluminium and aluminium alloys. The aim of this paper is to perform an anodization treatment to enhance the corrosion resistance of aluminium foam. Constant voltage anodization (12 V for 60 min) and pulsed current anodization (0.04 A/cm2 for 60 seconds and 0.01 A/cm2 for 15 seconds, repeated for 15 cycles) have been carried out in 15 wt% H2SO4 at 20°C. The anodized samples are observed in cross section by optical and electronic microscopes to investigate the structure of the anodic oxide layer and the presence of defects and to measure the thickness of the layer. The corrosion protection performance and the compactness of layers are evaluated using acetic salt spray test and electrochemical impedance spectroscopy.

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“…Whelan et al [18] formed a silane-based sol-gel sealing layer on anodized aluminum and indicated that the sol-gel sealer prepared from organically modified silane showed significantly better corrosion performance than the purely inorganic systems. Wojciechowski et al [19] found that Al-O-Si covalent bonds were created due to the condensation reaction between the anodized aluminum and silane compounds, and the silane coating showed the best anti-corrosion properties. However, the corrosion resistance of the siloxane sealed PEO coatings in different corrosion solution has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

Influence of Sealing Treatment on the Corrosion Resistance of PEO Coated Al-Zn-Mg-Cu Alloy in Various Environments

et al. 2019

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In the present work, a coating was prepared on an Al alloy substrate by plasma electrolytic oxidation (PEO). To seal the micro defects in the oxide scale, a siloxane layer was prepared on the PEO coating by sol gel method. The polymer sealant was synthesized from Tetraethoxy silane (TEOS) and methacryloxy propyl trimethoxyl silane (MPTES). The chemical structure of the polymer was studied by Fourier transform infrared spectroscopy (FTIR). The morphologies and microstructure of the PEO coating and siloxane coating were investigated by scanning electron microscopy (SEM). The results showed that siloxane formed a continuous layer on the surface and effectively sealed the micro defects. The corrosion behavior of the coatings in three different corrosion solutions (NaCl, HCl, and NaOH) was examined by electrochemical impedance spectroscopy and potentiodynamic polarization. The corrosion resistance of the sealed coatings was superior to that of the PEO coating because it prevented the penetration of corrosive solutions. The corrosion resistance of the sealed coatings was found to decrease with increasing electrolyte concentration. The work demonstrated that siloxane sealing may greatly enhance the corrosion resistance of Al-based PEO coating in acidic, neutral, and alkaline environments.

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Anti-corrosive properties of silane coatings deposited on anodised aluminium

Cited by 53 publications

References 39 publications

Electrochemical and adsorption behaviors of thiadiazole derivatives on the aluminum surface

Electrochemical and adsorption behaviors of thiadiazole derivatives on the aluminum surface

Study of anodizing process on aluminium foam to improve the corrosion behavior

Influence of Sealing Treatment on the Corrosion Resistance of PEO Coated Al-Zn-Mg-Cu Alloy in Various Environments

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