Coatings to increase the corrosion behaviour of aluminium foam

Rossi, Stefano; Fedel, Michele; Col, L. Da; Deflorian, F.; Petrolli, S.

doi:10.1080/02670844.2016.1276700

Cited by 12 publications

(8 citation statements)

References 25 publications

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“…In addition, the complexity of the surface, typical of metal foams, promotes the development of different aeration conditions, which negatively affect the overall corrosion behaviour of metal foams . This is one of the main reasons that limit the diffusion of aluminium foams in industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…The most recent literature on the corrosion protection techniques of aluminium foams has focused on metallic coatings obtained by electroless deposition or by high‐velocity‐oxyfuel spraying . Other explored methods are the deposition of organic coatings and the application of vitreous enamel coatings …”

Section: Introductionmentioning

confidence: 99%

“…negatively affect the overall corrosion behaviour of metal foams. 7,8 This is one of the main reasons that limit the diffusion of aluminium foams in industrial applications. Considering these aspects, aluminium foams are often combined with metal or polymeric panels, producing a sandwich structure, that isolate the foams from the external environment, preventing corrosion phenomena.…”

mentioning

confidence: 99%

“…The most recent literature on the corrosion protection techniques of aluminium foams has focused on metallic coatings obtained by electroless deposition 10 or by high-velocity-oxyfuel spraying. 11 Other explored methods are the deposition of organic coatings 7,8 and the application of vitreous enamel coatings. 7,12 The anodization treatment, 13,14 which is widely used on aluminium alloys, has not been deeply investigated as a potential protection method for aluminium foams.…”

mentioning

confidence: 99%

“…11 Other explored methods are the deposition of organic coatings 7,8 and the application of vitreous enamel coatings. 7,12 The anodization treatment, 13,14 which is widely used on aluminium alloys, has not been deeply investigated as a potential protection method for aluminium foams. In principle, anodization is a reliable and relatively economic route to preserve the surface texture, lightness, and heat and flame resistance.…”

mentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%