Investigation on Aluminum AA2024-T6’s Corrosion Behavior Coated by Plasma Electrolytic Oxidation in Maritime Media

نشریه مهندسی دریا

Reza Saleh¹  Sajjad Bordbar¹  Mostafa Alizadeh² 

[1] Department of Metals, Institute of Science and High Technology and Environmental Sciences;Graduate University of Advanced Technology, Kerman;

关键词: aluminum;    plasma electroytic oxidation;    ceramic coating;    maritime corrosion;   

DOI  :  

来源: DOAJ

【 摘 要 】

In this study, Plasma Electrolytic Oxidation (PEO) technique was used for generating ceramic layer on the surface of aluminum alloy AA2024-T6 and the effect of coating time on the electrochemical corrosion behavior, micro-hardness, morphology of coating, and the phase structure was studied. The alloy was coated in 1, 3, 5 and 7 minutes at a constant electrical potential 550 V in a sodium silicate solution 30 g/l. Coating surface morphology was studied by Scanning Electron Microscopy (SEM) and the electrochemical corrosion behavior was investigated by potentiodynamic and Electrochemical Impedance Spectroscopy (EIS) tests in 3.5 %wt. NaCl solution. Phases that generated during coating process were studied by X-Ray Diffraction (XRD) and hardness of coating was investigated by micro-hardness test. The results revealed that, as the coating time increases, the hardness value increases too. But, since the sample coated for 5 minutes exhibit the best morphology, it has shown the maximum corrosion resistance.

【 授权许可】

Unknown