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HomeMaterials Science ForumMaterials Science Forum Vol. 852Effect of Negative Duty Cycle on Micro-Arc...

Effect of Negative Duty Cycle on Micro-Arc Oxidation Coating of Titanium Alloy

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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 d_c is added to 45%; the hardness and corrosion resistance of coatings are distinctly improved compared with the matrix, with increasing the d_c, the coating hardness is strengthened while the anti-corrosion is weakened.

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Periodical:

Materials Science Forum (Volume 852)

Pages:

1050-1054

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.852.1050

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Online since:

April 2016

Authors:

Yong Du, Xiu Zhou Lin, Xue Jun Cui, Qian Wei Wang, Hui Li

Keywords:

Micro-Arc Oxidization (MAO), Negative Duty Cycle, Titanium Alloy

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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