The dissolution of porous oxide films on aluminium

Diggle, John W.; Downie, T. C.; Goulding, Christopher

doi:10.1016/0013-4686(70)85002-2

Cited by 106 publications

(44 citation statements)

References 16 publications

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“…4 and 5, where Pis a solubilized aluminum species and D is a deactivated (insoluble) surface site. These steps may involve interaction of X * sites with species in solution such as H+ and SO4- (Diggle et al, 1970). The deactivation process, Eq.…”

Section: Model Developmentmentioning

confidence: 99%

Kinetics of the dissolution of alumina in acidic solution in a flow system

et al. 1988

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The kineti.cs of dissolution of alumina in aqueous solutions of H,SO, was studied at ambient temperature under continuous-flow conditions. The results are consistent with a model involving rapid hydration of the surface, adsorption-desorption of H+ to form precursor sites, and ratedetermining parallel reactions of the precursor sites to form dissolved aluminum and an insoluble surface species. The model also involves renewal of a precursor site after each dissolution step.The adsorption-desorption of H+ was represented by a Langmuir isotherm. The dissolution data were correlated by a kinetic equation that was developed by assuming the dissolution step is first order in precursor concentration, and the deactivation step is second order in precursor concentration.

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Section: Model Developmentmentioning

confidence: 99%

Kinetics of the dissolution of alumina in acidic solution in a flow system

et al. 1988

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“…The key reactions responsible for the formation of anodic nanoporous Al 2 O 3 [28][29][30][31][32][33][34] and TiO 2 [36][37][38][39] apparently are similar. Initially, oxide grows at metal surface due to interaction of metal with O 2− or OH − ions [29].…”

Section: A Anodization Processmentioning

confidence: 99%

Effect of Ultrasonic Waves on the Formation of TiO<sub>2</sub> Nanotubes by Electrochemical Anodization of Titanium in Glycerol and NH<sub>4</sub>F

Hassan

Nanjo

Kanakubo

et al. 2009

e-J. Surf. Sci. Nanotech.

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The present work describes the anodic growth of self-organized TiO2 nanotubes (TiNT) on titanium samples in an electrolyte containing 3% NH4F and 5% H2O in glycerol. Two stages anodization were proceeded. Initially, the potential was ramped from 0V to 30, 40 and 60 V. In the second stage the potential was held at the given potential up to 5 hrs. The application of ultrasonic waves during anodization was found to increase the reaction rates as it decreased the concentration gradient of the anodization products around the electric double layer. This resulted in high current and faster growth rates of the nanotubes. The diameters of the TiNT created under ultrasonic wave condition were found to be smaller than the corresponding TiNT created under magnetic stirring. However, the morphology of the TiNT was badly affected as a result of surface perturbation resulting from heterogeneity in surface energy density. A better route for good looking TiNT is to grow them under magnetically stirred solution followed by cleaning by sonication in deionized water for 30 seconds. Increasing the anodization potential from 30 to 60 V increased the dimensions of the TiNT from around 90 nm to around 150 nm, respectively.

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“…Fortunately, they can develop an insulating film in the ambient atmosphere as a result of their natural tendency for direct oxidation with atmospheric oxygen under normal conditions [5]. The stability of the surface oxide formed on these materials and its protective nature represent a major field of research [6][7][8][9]. It was reported that the barrier film formed on Al and Al-alloys is of a dual Nature.…”

Section: Introductionmentioning

confidence: 99%

“…It was reported that the barrier film formed on Al and Al-alloys is of a dual Nature. It consists of an adherent, compact and stable inner layer of oxide film covered with a porous, less stable outer layer which is more susceptible to corrosion [7][8][9][10][11][12]. The surface oxide film on these materials is stable, in the pH range 4-9.…”

Section: Introductionmentioning

confidence: 99%

Corrosion evolution of the aluminum alloys used in overhead transmission lines

Rhaiem

Bouraoui

Halouani

2012

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The present paper is concerned with the corroded cables used few years ago. Microstructural evolution of the investigated cables is carried out by scanning electron and optical microscopies (SEM and OM). The results obtained from the comparison between the original (as-received) and used cables show the degradation of the surface and the presence of polluting elements. The evolution of mechanical properties is studied by the microhardness technique. The results reveal a deterioration of the mechanical properties of the used cables if compared with those obtained from the original cables. The main cause of the corrosion of the conductor was atmospheric corrosion elements in the case of high aggressive species such as Cl -and SO 2 .

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The dissolution of porous oxide films on aluminium

Cited by 106 publications

References 16 publications

Kinetics of the dissolution of alumina in acidic solution in a flow system

Kinetics of the dissolution of alumina in acidic solution in a flow system

Effect of Ultrasonic Waves on the Formation of TiO<sub>2</sub> Nanotubes by Electrochemical Anodization of Titanium in Glycerol and NH<sub>4</sub>F

Corrosion evolution of the aluminum alloys used in overhead transmission lines

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