Abstract
Micro-arc oxidation coating on TC4 titanium alloy was fabricated in Na2SiO3-Na3PO4 -NaOH electrolyte under constant voltage mode using a multifunctional device that is self-designed. The effects of negative duty cycle on the coating thickness, surface morphology, hardness, phase composition and anti-corrosion were studied via SEM, XRD etc. The results show that, with increasing the negative duty cycle, the coating thickness is reduced; the coating surface presents typical ceramic structure with micro-pores, the quantity of micro-pores on coating surface is reduced, the diameter of pores is enlarged and cracks are appeared with the increase of negative duty cycle; the phase ingredients are mainly composed of Ti, rutile and anatase TiO2 and the peak of matrix is disappeared while the dc is added to 45%; the hardness and corrosion resistance of coatings are distinctly improved compared with the matrix, with increasing the dc, the coating hardness is strengthened while the anti-corrosion is weakened.
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