Abstract
Ceramic coatings were achieved on Q235 carbon steel by plasma electrolytic oxidation in aluminate system with and without Na 2WO 4 and Na 2SiO 3 additives in electrolyte. Influence of Na 2WO 4 and Na 2SiO 3 on surface morphology, phase and elemental composition of PEO coatings were examined by means of scanning electron microscope (SEM), thin-film X-ray diffraction (TF-XRD) and energy dispersive X-ray spectroscopy (EDS). Effects of the two additives on the properties of the coatings including surface roughness, surface micro hardness and friction coefficient were studied. The results showed that W from Na 2WO 4 and Si from Na 2SiO 3 in electrolytes entered into the coatings. Na 2WO 4 additive had no evident effect on phase composition of the coating, while Na 2SiO 3 additive resulted in the coating changing from crystalline state to amorphous state and increased the content of P in the coating. Both additives reduced the surface roughness of the coatings. With Na 2WO 4 or Na 2SiO 3 into the electrolytes, the surface micro hardness of the coating was enhanced to 1433 and 1478, respectively, and the friction coefficients were also decreased to below 0.1.
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