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電流密度對TC11鈦合金微弧氧化性能的影響
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西南石油大學(xué)

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Effect of Current Density on Micro-arc Oxidation Properties of TC11 Titanium Alloy
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    摘要:

    鈦合金耐磨性和耐腐蝕性的弱點(diǎn)已經(jīng)成為限制鈦合金使用的瓶頸。在本項(xiàng)工作中,以硅酸鈉(Na2SiO3)和鎢酸鈉(Na2WO4)為電解質(zhì)在TC11鈦合金表面生成一層微弧氧化膜。使用掃描電子顯微鏡(SEM)、X射線衍射(XRD)和顯微硬度測試儀等觀察涂層表面形貌和橫截面形貌以及內(nèi)外陶瓷膜層的顯微硬度。與基體鈦合金相比,當(dāng)電流密度為9A/dm2,膜層的顯微硬度得到提高,但附著力有所降低。 此外,在3.5%NaCl和30%H2SO4溶液中比較分析了膜層的電化學(xué)腐蝕和一般腐蝕,當(dāng)電流密度為9A/dm2時(shí),在30%H2SO4溶液中的膜層具有較低的自腐蝕電流密度。最后,通過SiC和膜層的對磨實(shí)驗(yàn)研究了膜層的磨損機(jī)理。

    Abstract:

    The weakness of wear resistance and corrosion resistance of titanium alloy has become a bottleneck restricting the use of titanium alloy. In this work, the micro-arc oxidation coating is performed on TC11 sample in electrolyte prepared by sodium silicate (Na2SiO3) and sodium tungstate (Na2WO4). Scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-hardness tester are used to observe the coating surface and cross-sectional morphology, micro-hardness of the inner and outer ceramic coating. The coating is mainly composed of TiO2, γ-Al2O3, and Al2TiO5. TiO2 consists of anatase-TiO2 and a small amount of rutile-TiO2. The outer coating contains a large amount of amorphous SiO2. The electrochemical corrosion and general corrosion of the coating are comparatively analyzed in 3.5% NaCl and 30% H2SO4 solution, and the coating obtained in the 30% H2SO4 solution has a lower self-corrosion current density. Finally, the wear mechanism of the coating is studied by the anti-wear experiment with SiC.

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楊眉,唐寧,黃婷玉,楊洪浪,劉洋,王丹,劉偉.電流密度對TC11鈦合金微弧氧化性能的影響[J].稀有金屬材料與工程,2020,49(2):404~411.[Mei Yang, Ning Tang, Tingyu Huang, Honglang Yang, Yang Liu, Dan Wang, Wei Liu. Effect of Current Density on Micro-arc Oxidation Properties of TC11 Titanium Alloy[J]. Rare Metal Materials and Engineering,2020,49(2):404~411.]
DOI:10.12442/j. issn.1002-185X.20180922

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  • 收稿日期:2018-09-05
  • 最后修改日期:2019-12-17
  • 錄用日期:2018-11-08
  • 在線發(fā)布日期: 2020-03-12
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