Hydrated oxide film growth on aluminium alloys immersed in warm water

Some effects of alloy composition on stress corrosion cracking in Al–Zn–Mg–Cu alloys

“…The structures of hydrated oxide films are known to be affected by relative humidity [47] and by alloy composition [48], and there could be phase changes at particular levels of relative humidity, composition, and temperature. (A change in colour of the oxide film of AA7022-T651 alloy in distilled water over a narrow temperature range around 40 • C has been observed, suggesting that phase changes do occur [18].)…”

Hierarchically macro-/mesoporous structured Co–Mo–Ni/γ-Al2O3 catalyst for the hydrodesulfurization of thiophene

“…7b) is specified as the bending modes of hydroxyl groups in alcohol, water and Al-OH-Al groups [40], and is recognized as a characteristic of boehmite or pseudo-boehmite [43]. Moreover, the small shoulder at 3100 cm −1 indicates the appearance of boehmite [40].…”

The effect of warm water surface treatments on the fatigue life in shear of aluminum joints

“…Alwitt [5] demonstrated that such a pseudoBoehmite layer is produced on pure aluminum when it is immersed in pure water at or above 50 1C. Inspired by this information, further work has shown that a porous hydrated oxide structure can be obtained on the bare aluminum alloy 2024 T3 and the clad alloy, 7075 T6 at water temperatures as low as 40 1C [6]. When warm water pretreatment at either 40 or 50 1C has been used on these alloys, adhesive joints that give excellent performance in the wedge test have been produced [7].…”