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含石墨微粒的電解液中電流密度對ZL108微弧氧化膜層特性的影響
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西南石油大學材料科學與工程學院

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中圖分類號:

TG174.4

基金項目:

the Scientific Research Starting Project of Southwest Petroleum University (2015QHZ020)


Effects of current densities on ZL108 Aluminum alloy MAO coatings in an electrolyte containing graphite micro-particles
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Affiliation:

College of Materials Science and Engineering, Southwest Petroleum University

Fund Project:

the Scientific Research Starting Project of Southwest Petroleum University

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    摘要:

    在含石墨微粒的硅酸鈉電解液中，采用不同的電流密度（1, 5, 10，15和20 A/dm2）在ZL108鋁合金上制備了微弧氧化（MAO）膜層。利用SEM、EDS、XRD、渦流測厚儀和顯微硬度計對微弧氧化膜層的特性進行了研究。結果表明，隨著電流密度的增加，微弧氧化膜層的增厚導致氧化電壓增加。微弧氧化膜表面多孔，微孔的直徑和燒結盤尺寸逐漸增加。膜層表面C、Si元素的相對含量隨電流密度增加而增多，C元素在膜層表面呈均勻分布，膜層截面C元素主要集中在膜層外側。膜層主要由SiC, SiO2, θ-Al2O3, α-Al2O3組成, SiC相來源于石墨與SiO2反應。隨電流密度增大，膜層硬度增加。膜層耐蝕性呈先升高后降低的趨勢，并在5A/dm2時膜層腐蝕速率最低。

    Abstract:

    Micro-arc oxidation (MAO) coatings were prepared on ZL108 aluminum alloy in the Na2SiO3 electrolyte adding graphite micro-particles at different current densities (1, 5, 10, 15 and 20 A/dm2). The characteristics of MAO coatings were studied by SEM, EDS, XRD, eddy-current thickness meter and micro-hardness tester. The result showed that the thickening of MAO coatings led to the increase of the oxidation voltages with the increase of current density. The surface of MAO coatings was porous. The diameter of micro-pore and the size of sintering discs gradually increased. The relative counts of C and Si element on the surface of MAO coatings increased with the increasing of current density. The C element was uniform distribution on the surface of MAO coatings. The C element on cross-sectional of MAO coatings mainly concentrated on outer side. MAO coatings mainly consist of SiC, SiO2, θ-Al2O3, α-Al2O3. The SiC phase derived from the reactions of SiO2 with graphite. With the increase of current density, the MAO coatings hardness increased. MAO coatings prepared at 5A/dm2 exhibited the lowest corrosion rate.

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王平,肖佑濤,吳佳欣,蒲俊,曹文潔,伍婷.含石墨微粒的電解液中電流密度對ZL108微弧氧化膜層特性的影響[J].稀有金屬材料與工程,2019,48(2):394~400.[Ping Wang, You Tao Xiao, Jia Xin Wu, Jun Pu, Wen Jie Cao, Ting Wu. Effects of current densities on ZL108 Aluminum alloy MAO coatings in an electrolyte containing graphite micro-particles[J]. Rare Metal Materials and Engineering,2019,48(2):394~400.]
DOI：10.12442/j. issn.1002-185X.20170794

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  • 收稿日期:2017-09-04
  • 最后修改日期:2017-11-21
  • 錄用日期:2017-12-13
  • 在線發(fā)布日期: 2019-03-15
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