Preparation and Infrared Properties of Aluminum Oxide Films*

Harris, Louis

doi:10.1364/josa.45.000027

Cited by 82 publications

(16 citation statements)

References 4 publications

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“…This peak has been assigned to the Al O vibration arising from the Al2O3 layer on the surface which is in good agreement with previous reports [10] and [11]. NaOH treatment is generally used to remove the native oxide layer present on aluminum surfaces mostly prior to anodization processes [12], [13] and [14]. In the present case, the IR spectral investigations indicate that the NaOH treatment of aluminum surfaces results in the formation of a new stable form of oxide of the form ) on the surface following removal of the weak native oxide layer in addition to creating microrough surface features (Fig.…”

Section: Methodssupporting

confidence: 89%

A simple surface treatment and characterization of AA 6061 aluminum alloy surface for adhesive bonding applications

Noormohammed

Sarkar

Paynter

et al. 2012

Applied Surface Science

146

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Structural adhesive bonding of aluminum is widely used in aircraft and automotive industries. It has been widely noted that surface preparation of aluminum surfaces prior to adhesive bonding plays a significant role in improving the strength of the adhesive bond. Surface cleanliness, surface roughness, surface wettability and surface chemistry are controlled primarily by proper surface treatment methods. In this study, we have employed a very simple technique influencing all these criteria by simply immersing aluminum substrates in a very dilute solution of sodium hydroxide (NaOH) and we have studied the effect of varying the treatment period on the adhesive bonding characteristics. A bi-component epoxy adhesive was used to join the treated surfaces and the bond strengths were evaluated via single lap shear (SLS) tests in pristine as well as degraded conditions. Surface morphology, chemistry, crystalline nature and wettability of the NaOH treated surfaces were characterized using various surface analytical tools such as scanning electron microscopy and energy dispersive X-ray analysis (SEM/EDX), optical profilometry, infrared reflection absorption spectroscopy, Xray photoelectron spectroscopy, X-ray diffraction and contact angle goniometry.Excellent adhesion characteristics with complete cohesive failure of the adhesive were encountered on the NaOH treated surfaces that are comparable to the benchmark treatments such as anodization, which involve use of strong acids and multiple steps of treatment procedures. The NaOH treatment reported in this work is a very simple method with the use of a very dilute solution with simple ultrasonication being sufficient to produce durable joints. Graphical AbstractHighlights A very simple surface treatment method to achieve excellent and durable aluminum adhesive bonding. Our method involves simple immersion of aluminum in very dilute NaOH solution at room temperature with no involvement of strong acids or multiple procedures. Surface analysis via various surface characterization techniques showed morphological and chemical modifications favorable for obtaining highly durable bond strengths on the treated surface. Safe, economical, reproducible and simple method, easily applicable in industries.

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Section: Methodssupporting

confidence: 89%

A simple surface treatment and characterization of AA 6061 aluminum alloy surface for adhesive bonding applications

Noormohammed

Sarkar

Paynter

et al. 2012

Applied Surface Science

146

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“…[13] the parameter of a power law time dependence Dm ¼ k m t N was determined in a TGA measurement for Aluchrom YHf at 1050 -C with k m ¼ 0.081 mg/cm 2 /h N and N ¼ 0.3. With these data and a diffraction index n for the Al 2 O 3 of about 1.6 [22], the times to reach the minima and maxima were calculated. They fit the measurement with constant temperature in Fig.…”

Section: Appendixmentioning

confidence: 99%

Influence of minor additions on the emissivity of the oxide scale of FeCrAlY alloys during resistance heating

Hattendorf¹

2011

Materials & Corrosion

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Chromium aluminum yttrium (FeCrAlY) alloys owe their low oxidation rate to the formation of a slow growing α‐alumina scale. For material used for heating elements not only the life time and the behavior of the resistance during the life time is of relevance, but also the emission coefficient of the oxide scale. The power density JS produced by resistance heating of strip with 50 µm thickness and about 5–6 mm width at 1050 °C is approximately equal to the radiant flux density, which is according to Stefan–Boltzmann's law proportional to the total emission coefficient εg. Resistance heating tests were performed on samples made from FeCrAlY alloys with different zirconium and carbon content. The “high zirconium” containing FeCrAlY alloys (zirconium > about 0.10%) have a higher power density/emissivity than the “low zirconium” alloys. In parallel with this, all samples with higher power density/emissivity have internal oxidation and therefore a “rough” metal–oxide interface. Thus, one cause for the increase of the emissivity of the scale could be this rough metal–oxide interface; other causes could be a higher amount of zirconium incorporated into the scale, more pores and/or different grain structure in the scale. Additionally the carbon content influences the appearance of a higher emissivity and the internal oxidation.

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“…The first two bands (n 1 and n 2 ) are characteristic of lattice vibrations of most of the metallic oxides [15] and arise from the vibrations of oxide ions against the metal ion in the lattice. The difference in the band positions of n 1 and n 2 could be related to the difference in the Fe 3 -O 2--distance for A-and B-sites.…”

Section: Infrared Spectramentioning

confidence: 99%

Infrared and M�ssbauer Investigations of CdGaxFe2?xO4 Spinels

Mahmoud¹,

Abdelrahman²,

Abdalla³

et al. 2001

phys. stat. sol. (b)

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The Cd-Ga ferrite system CdGa x Fe 2--x O 4 (where x ¼ 0, 0.6 and 1.0) was studied by means of infrared (IR) and Mö ssbauer spectroscopy. IR spectra revealed two prominent bands n 1 and n 2 which were assigned to tetrahedral and octahedral metal complexes, respectively. The position of the highest frequency band n 1 showed an increase with increasing gallium concentration. The lowest band n 2 was broadened and diffused with gallium substitution. Mö ssbauer spectra at room temperature exhibited paramagnetic doublet lines. As a result of distortion in the oxygen positions surrounding the B-sites, the quadrupole interaction in the Mö ssbauer spectra increased with increasing gallium concentration. IR and Mö ssbauer spectra revealed the absence of Fe 2+ ions at both tetrahedral and octahedral sites.

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Preparation and Infrared Properties of Aluminum Oxide Films*

Cited by 82 publications

References 4 publications

A simple surface treatment and characterization of AA 6061 aluminum alloy surface for adhesive bonding applications

A simple surface treatment and characterization of AA 6061 aluminum alloy surface for adhesive bonding applications

Influence of minor additions on the emissivity of the oxide scale of FeCrAlY alloys during resistance heating

Infrared and M�ssbauer Investigations of CdGaxFe2?xO4 Spinels

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