Microstructure and properties of plasma electrolytic oxidation coating on 55% SiCp/Al matrix composites
作者： Shutao Huang , Chunyan Du , Xiaolin Yu , Hui Zhao , Quanzhao Wang
DOI: 10.1016/J.SURFCOAT.2021.127321
关键词:
摘要: Abstract Protective coating was successfully prepared on two types of SiCp/Al matrix composites by plasma electrolytic oxidation (PEO) method, where the contains high volume fraction SiC particles with sizes 60 μm and 40 μm, respectively. Current-time curves were recorded during PEO process in a constant voltage mode. The surface cross-section morphologies, composition adhesive force coatings characterized scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) diffraction (XRD), adhesion automatic scratch tester, electrochemical corrosion behavior substrate coated investigated 3.5% NaCl solution potentiodynamic polarization tests EIS. results show that current change trend morphology features type consistent. at could hinder formation film ejection melt, resulting rough, uneven pores variable sizes, coarse molten micro-cracks coatings. There is ablation 60 μm-SiC/Al coating. mainly composed mullite, α-Al2O3, γ-Al2O3 amorphous phases. 40 μm-SiC/Al composite (68.1 N) better than (22.0 N). resistance improved treatment.
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