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標題: Characterization of the electrolytic ZrO2 coating on Ti-6Al-4V
作者: Yen, S.K.
Huang, T.Y.
關鍵字: electrolytic gel coatings;ZrO2;Ti-6Al-4V alloy;phase;pure;ph
Project: Materials Chemistry and Physics
期刊/報告no:: Materials Chemistry and Physics, Volume 56, Issue 3, Page(s) 214-221.
An electrolytic ZrO2 gel has been coated on Ti-6Al-4V alloy specimens in 0.125 M ZrO(NO3)(2) solution with pH = 2.2 at a current density of 2 mA/cm(2). The electrolytic ZrO2 gel coating is annealed at 623-1073 K for 5 or 40 min in air, then evaluated by electrochemical polarization in 0.6 M NaCl, immersion tests in several acid solutions, morphology observations and scratch tests. The crystal structures of titanium oxide or ZrO2 are analysed by XRD (X-ray diffractometry). The ZrO2-coated specimen annealed at 973 K for 5 min shows a good adhesion of 580 MPa and a good corrosion resistance in 5 M HCl, 5 M H2SO4 or 0.6 M NaCl aqueous solution. A monoclinic structure with ((1) over bar 11) preferred orientation parallel to the sheet plane is detected at 623 K less than or equal to T less than or equal to 698 K and a metastable tetragonal structure of ZrO2 is detected at T> 698 K. Then a more stable monoclinic structure with random orientation and tetragonal structure are detected at T greater than or equal to 973 K. (C) 1998 Elsevier Science S.A. All rights reserved.
ISSN: 0254-0584
DOI: 10.1016/s0254-0584(98)00178-3
Appears in Collections:材料科學與工程學系

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