Abstract
In the present work, the novel anodic oxide film (AOF) with self-sealing layer was successfully fabricated on 2024Al alloys by using an improved anodic oxidation method. The presence of the self-sealing layer on the porous layer of AOF was verified by Field emission scanning electron micro scope. Confocal laser scanning microscope (CLSM) and X-ray photoelectron spectroscopy (XPS) were used to evaluate the morphology and the corrosion products of the AOF after salt spray test. The microhardness test showed that the self-sealing AOFs still displayed high hardness even after salt spray test. Electrochemical test and salt spray test results illustrated the excellent corrosion performance of the novel structured self-sealing anodic oxide film (SAOF) compared with common porous AOFs. The narrow diameter makes it difficult for chlorine ions ingress into the pores of SAOFs. The self-sealing layer played an important role in protecting the SAOF from corrosion.
Highlights
Aluminum and aluminum alloys are widely used in the aerospace, automotive industry and ocean environment due to their excellent performances, such as high specific strength, corrosion resistance and biocompatibility for both technical and economic considerations[1]
The anodic oxide film (AOF) were prepared by using the common anodizing method
The aluminum alloys cathode and the aluminum sulfate in the electrolyte increased the Al3+ concentration which hindered the dissolution of the outer surface of AOFs20
Summary
Aluminum and aluminum alloys are widely used in the aerospace, automotive industry and ocean environment due to their excellent performances, such as high specific strength, corrosion resistance and biocompatibility for both technical and economic considerations[1]. In the case of self-sealing AOFs, the self-sealing layer of SAOF hindered the chlorine ions ingress into the pores of films, the higher Ecorr and lower icorr indicating better corrosion resistance.
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