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| Effect of micro--arc oxidation current density on the structure of the coatings by a compound oxidation preparation |
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| 清华大学 |
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Cite this article:
;. Effect of micro--arc oxidation current density on the structure of the coatings by a compound oxidation preparation. Chin J Mater Res, 2004, 18(4): 435-442.
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Abstract Influence of the current density on the structure and properties of porous
titania coatings prepared by the compound process (pre-oxidation and micro--arc
anodic oxidation) was studied by means of SEM, EDS, X--ray diffraction and
micro--hard meter. The morphologies, phase structures, element compositions and
micro--hardness were tested. The results show that there are obvious effects of
the current density on the structure and properties of titania coatings. The coatings
are mainly composed of anatase when the current density is kept in a low level
(20 mA/cm$^{2}$). When the current density increases, anatase decreases and rutile
increases. The pores diameter, surface roughness and hardness of the coatings
increase, and the molar ratios of Ca/P are changed at the same time.
When the current density are 20, 40, 60, 80 and 100 mA/cm$^{2}$, the molar ratios
of Ca/P are 1.22, 1.60, 1.89, 2.01, 2.12, respectively. The porous titania coating
containing Ca and P with preferable microstructure and property can be prepared when
the current density is at 40 mA/cm$^{2}$.
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Received: 01 September 2004
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