| The mechanical properties and processability of aluminum alloy are outstanding in many non-ferrous metal alloys,and they are widely used in the fields of 5G base station construction,electronic equipment manufacturing,cable processing,building materials,etc.The thickness of the aluminum oxide film formed in natural environment is about 10-20 nanometers,which can only provide the protection against external corrosion in neutral and weak alkaline environment.Once in a harsh environment,this natural oxide film will be destroyed.This will seriously restrict the outdoor applications of aluminum alloy to communication tower,antenna base plate and engine room.In order to make the base station shell,5G antenna and electronic devices work stably in complex environment,the anti-corrosion technology of aluminum alloy is particularly important.Nowadays,anodic oxidation is an effective way and sealing treatment after anodic oxidation is necessary to improve the corrosion resistance.In this contribution,the 2024 anodized aluminum alloy film was sealed by KAl?SO4?2 solution and the effect of sealing on corrosion resistance was investigated by means of potentiodynamic polarization curves,electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy.The experimental results show that the optimal parameters for KAl?SO4?2 sealing are 35?,with the p H value of 8,the concentration of 8 g/L,and the sealing time of 3min.The corrosion resistance of the KAl?SO4?2 sealed sample can be significantly improved than that of unsealed one,and is obviously superior to that of the conventional hydrothermal sealed sample.Furthermore,X-ray photoelectron spectroscopy demonstrated that more Al?OH?3 would be formed in the process of KAl?SO4?2 sealing,which will shrink the diameter of the microporous and therefore results in the excellent corrosion resistance.Therefore,our research is helpful for the infrastructure guarantee and equipment technology upgrades in the fields of electronics and communications. |
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