Accelerated growth of oxide film on aluminium alloys under steam: Part II: Effects of alloy chemistry and steam vapour pressure on corrosion and adhesion performance

Din, Rameez Ud; Bordo, Kirill; Jellesen, Morten Stendahl; Ambat, Rajan

doi:10.1016/j.surfcoat.2015.06.060

Cited by 24 publications

(12 citation statements)

References 39 publications

(31 reference statements)

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“…3) shows additional effect of water vapour and sodium chloride ions on the oxide film growth. It leads to more intensive crack formation and healing and, consequently, increases the hindered contraction factor that in agreement with known data on aluminium oxidation and corrosion [17][18][19][20].…”

Section: Resultssupporting

confidence: 89%

Irreversible Thermal Expansion of Replicated Aluminium Foam

Finkelstein¹,

Husnullin²

2018

Acta Metall Slovaca

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Irreversible thermal expansion of large items made of the replicated aluminium foam was detected during the extraction of soluble filler from Al-NaCl composite. Sources of the phenomenon were investigated The expansion discovered was caused by incomplete contraction of the porous metal due to the oxidation of its internal porous surface in air and water mediums during thermal cycling. Significant influence of oxide film defects on the expansion process was shown. The information about irreversible thermal expansion dependence on temperature of the extraction process and metal foam pore size was collected. Measurements of expansion dynamics showed its finite character. It was also noted that the expansion is limited by the thermal expansion coefficient of an alloy used. Finally, correction coefficients were obtained that, being applied to nominal sizes of a porous item, compensates the expansion.Keywords: aluminium, replicated foam, alumina film, micro-cracks, contraction, thermal expansion IntroductionThe effect of irreversible three-dimensional expansion of items was detected at the stage of soluble filler extraction during the manufacturing process of commercial replicated aluminum foam at Composite Materials LLC (Kirovgrad, Russia) [1]. Replicated aluminum foam technology involves mechanical treatment to final shape before the filler dissolving from the casting body. This treatment was applied during the process of mold fabrication for expandable polystyrene (EPS) molding with an overall dimension of 850 mm. Control measurement, performed by the customer, showed the overall dimension of 854 mm, not 850 mm, and the product was rejected. It was checked that the dimensional non-compliance was not a mistake at the machining process but the consequence of the filler extraction in accordance with the adopted manufacture technology. The case of the expansion was not identified by the other researchers of the replicated aluminum foam technology [2,3,4,5] due to insignificant sizes of laboratory specimens (not over 200 mm). In this case extraction of the filler is not a difficult task and may be realized within the mode of water external convection at room temperature. Such extraction process is ineffective if sizes of a casting are large, as mentioned above. Non-soluble aluminum hydroxide is formed in the pores while casting is immersed into water for a long time. The hydroxide blocks the process of the filler extraction. A casting is to be heated up to 200-300°С before immersion into the water in order to form a gap between the metal surface and the filler particles [5].Also formation of the gap is used for acceleration of wax model removing from the ceramic molds in the investment casting process [6].

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Section: Resultssupporting

confidence: 89%

Irreversible Thermal Expansion of Replicated Aluminium Foam

Finkelstein¹,

Husnullin²

2018

Acta Metall Slovaca

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“…Further, the level of corrosion protection provided by the steam treatment with additives in the present study was higher than the reported simple steam treatment (1.3 bar vapour pressure of steam) [31,32]. Similar effect was observed forfiliform corrosion and AASS performance when comparing with the simple steam treatment [31]. This is attributed closely to the effect of additives in providing local coverage of the alloy microstructure during steam treatment with additives [31,33].…”

Section: Discussionsupporting

confidence: 64%

“…Similar effect was observed forfiliform corrosion and AASS performance when comparing with the simple steam treatment [31]. This is attributed closely to the effect of additives in providing local coverage of the alloy microstructure during steam treatment with additives [31,33]. Simple dipping in KMnO 4 at 85 • C resulted in slight decrease in anodic current density for both alloys, while no effect was found on cathodic activity indicating lack of coverage over the cathodic intermetallic particles.…”

Section: Discussionsupporting

confidence: 60%

“…The results clearly showed that the coatings formed under steam treated conditions provided adequate corrosion protection and adhesion needed for the industrially applied powder coating. Further, the level of corrosion protection provided by the steam treatment with additives in the present study was higher than the reported simple steam treatment (1.3 bar vapour pressure of steam) [31,32]. Similar effect was observed forfiliform corrosion and AASS performance when comparing with the simple steam treatment [31].…”

Section: Discussionsupporting

confidence: 54%

“…The tape adhesion test indicated similar behaviour for all steam treated surfaces, which was directly related to the micro roughness and interface bonding. The microscopic roughness provided by the needle structure is an important factor to provide mechanical adhesion [31].…”

Section: Discussionmentioning

confidence: 99%

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Steam assisted oxide growth on aluminium alloys using oxidative chemistries: Part II corrosion performance

Din

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Ambat

2015

Applied Surface Science

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Evolution of surface characteristics of two industrial 7xxx aluminium alloys exposed to humidity at moderate temperature

Schwarzenböck

Hack

Kolb

et al. 2019

Surface & Interface Analysis

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This study analyses the evolution of surface characteristics of two industrial high‐strength 7xxx aluminium alloys with a focus on alloy composition and environmental parameters. Based on storage and transport conditions of as‐machined products, the effect of humidity—as liquid and vapour phase—on the natural oxide layer has been studied. The evolution of the natural oxide layer has been analysed by scanning electron microscopy and X‐ray photoelectron spectroscopy. The growth behaviour of the surface layer is dominated by environmental conditions, while microgalvanic activity depends mainly on the alloys' chemical composition and differs significantly for tested alloys. Scanning transmission electron microscopy images demonstrated that the long‐term exposure at moderate temperatures affects the microstructure near the surface, which differs for the analysed alloy compositions. An anomalous precipitation of zinc‐rich particles at the surface and along the precipitate‐free zone is observed for the alloy with higher Zn/Mg ratio and lower Cu content.

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Accelerated growth of oxide film on aluminium alloys under steam: Part II: Effects of alloy chemistry and steam vapour pressure on corrosion and adhesion performance

Cited by 24 publications

References 39 publications

Irreversible Thermal Expansion of Replicated Aluminium Foam

Irreversible Thermal Expansion of Replicated Aluminium Foam

Steam assisted oxide growth on aluminium alloys using oxidative chemistries: Part II corrosion performance

Evolution of surface characteristics of two industrial 7xxx aluminium alloys exposed to humidity at moderate temperature

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