Study on the wear resistance and corrosion behaviour of self-sealed MAO/ZrO2 coatings prepared on 7075 aluminium alloy

Qi, Xing; Li, Jun; He, Yafeng; Liu, Yuntong; Liu, Rui; Song, Renguo

doi:10.1016/j.jallcom.2023.172436

Cited by 21 publications

(1 citation statement)

References 54 publications

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“…To overcome this obstacle, micro-arc oxidation has emerged by providing in situ growth of amorphous passivation layers on metal surfaces. , Nevertheless, during this process, numerous pores and cracks with several tens of micrometers are unavoidably produced in the oxide coatings due to the high-voltage discharge, which strictly limits their practical performances. − More interestingly, recent studies declared that the femtosecond laser irradiation on metal surfaces can not only fabricate hierarchic micro- and nanostructures but also in situ generate amorphous components without permeable defects. − For instance, Hashida et al found the amorphous formation on single-crystal copper films when using the femtosecond laser to induce the periodic surface structures. Moreover, Florian et al revealed the formation of amorphous oxides on the surface of titanium alloys during the femtosecond laser production of various structures (periodic surface structures, grooves, and spikes).…”

Section: Introductionmentioning

confidence: 99%

Dense Amorphous Passivation Layer Formed on Aluminum Alloy Surfaces by Femtosecond Laser-Assisted Oxygen-Rich Doping

Zhang,

Yan,

Zou

et al. 2024

Langmuir

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Aluminum (Al) alloy surfaces are prone to serious corrosion in humid and salt-laden environments, which promotes the development of numerous protective approaches. Although the amorphous state is more conducive to improve corrosion resistance compared with the crystalline state, it still faces coating design problems like insufficient adhesive strength and flaking-off tendency. Here, we propose a strategy of femtosecond laser-assisted oxygen-rich doping to in situ create a dense high-quality passivation layer on Al alloy surfaces. With respect to the femtosecond laser processing in traditional air ambience, the material surface modifications within the oxygen-rich environment demonstrate some distinctiveness. For the ridge area of the laser ablation grooves, the oxidation surface is separated into two layers: the outer region presents a loose and porous appearance similar to the observations in the air ambience, while the inner region exhibits complete and homogeneous oxidation, especially associated with the continuous distribution of the amorphous substance, in sharp contrast to the nanoscale discrete amorphous formation in the air case. Simultaneously, the high degree of material oxidization with the amorphous phase is also developed on the wallside area of the groove valleys, which is much different from the incomplete oxidation in the air ambience. As a result, the measured corrosion current decreases by 49 times to a value of I corr = 1.19 × 10–10 A/cm2 relative to the laser treatment in the air environment. Such a method offers the prospect for elevating the anticorrosion performance of metal surfaces.

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