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電解液中鈣磷組分對鎂合金MAO生物陶瓷膜層特性的影響
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江蘇高校優(yōu)勢學科建設工程資助項目 (蘇政辦[2011]6); 江蘇省先進焊接技術重點實驗室資助項目(JSAWT-11); 江蘇省高校研究生科研創(chuàng)新計劃資助項目(2014-1081)


Influence of the Ca- or P-containing Electrolyte Compositions on Properties of Micro-arc Oxidation Coatings Fabricated on Mg Alloy
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    摘要:

    采用恒流模式，通過單變量實驗改變電解液中乙酸鈣、六偏磷酸鈉和磷酸二氫鈉等鈣磷組分的濃度，在AZ31鎂合金表面制備微弧氧化生物陶瓷膜，觀察分析膜層微觀組織結(jié)構(gòu)，測定膜層表面Ca/P比、耐蝕性等，探討鈣磷組分及其濃度對膜層組織和性能的影響，進而對電解液進行優(yōu)化，并對優(yōu)化后的膜層性能進行觀察和分析。結(jié)果表明：乙酸鈣、六偏磷酸鈉、磷酸二氫鈉對膜層Ca、P元素含量及Ca/P比值有決定作用；乙酸鈣濃度越高，膜層厚度越小，但是均一性越好；六偏磷酸鈉濃度對膜層表面形貌和厚度幾乎無影響，其濃度越高，膜層中P元素含量越高；磷酸二氫鈉濃度越高，Ca/P比值越小。電解液優(yōu)化后，制備的膜層較為平整致密，表面均勻分布10.7 μm左右的微孔，但存在微裂紋；膜層主要由MgO、Mg和少量Ca2P2O7、SiO2等物相組成，使硬度和耐蝕性比鎂合金基體有明顯提高；膜層粗糙度Ra=0.45 μm，潤濕角為42.65°，有利于細胞的附著與生長

    Abstract:

    Micro-arc oxidation was conducted on AZ31 Mg alloy under CC mode by single variable experiments to improve its corrosion resistance and bio-activity. The microstructure, Ca/P ratio and corrosion rate were studied to investigate the influence of the Ca- or P-containing compositions on the coating. Furthermore, the properties of the optimized coating were studied. The results reveal that Ca/P ratio depends on the concentration of Ca(Ac)2, (Na2PO3)6 and NaH2PO4. With the increase of Ca(Ac)2, the coating thickness decreases, but it becomes more uniform; while (Na2PO3)6 has little effects on surface morphology or coating thickness. The content of P increases with (Na2PO3)6. The more NaH2PO4, the bigger the pore size and the smaller Ca/P ratio. The optimized coating possesses a flat and compact surface covered by micropores with diameters of about 10.7 μm and there are microcracks. And the coating phases are mainly MgO, Mg and a small amount of Ca2P2O7 and SiO2, which make the coating harder and more resistant to corrosion. The coating roughness Ra is 0.4482 μm and the wetting angle is 42.65°, which are good for cells to adhere to and grow on.

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許 蕾,王澤鑫,杜翠玲,陳 靜,蘆 笙.電解液中鈣磷組分對鎂合金MAO生物陶瓷膜層特性的影響[J].稀有金屬材料與工程,2015,44(10):2576~2582.[Xu Lei, Wang Zexin, Du Cuiling, Chen Jing, Lu Sheng. Influence of the Ca- or P-containing Electrolyte Compositions on Properties of Micro-arc Oxidation Coatings Fabricated on Mg Alloy[J]. Rare Metal Materials and Engineering,2015,44(10):2576~2582.]
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  • 收稿日期:2014-10-28
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  • 在線發(fā)布日期: 2016-07-13
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