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ZL108鋁合金微弧氧化膜的Na2MoO4改性機(jī)理
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油氣藏地質(zhì)及開(kāi)發(fā)工程國(guó)家重點(diǎn)實(shí)驗(yàn)室（西南石油大學(xué)）資助項(xiàng)目（PLN1307）；四川省教育廳重點(diǎn)資助項(xiàng)目（12ZA293）；西南石油大學(xué)校級(jí)基金資助項(xiàng)目（2012XJZ015）


Na2MoO4 Modifying Mechanism of Micro-arc Oxidation Coating on ZL108 Aluminum Alloy
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    摘要:

    為了研究ZL108鋁合金微弧氧化膜的Na2MoO4改性機(jī)理，在添加5種不同濃度的Na2MoO4溶液中對(duì)其進(jìn)行微弧氧化處理。利用掃描電鏡(SEM)觀察微弧氧化膜表面形貌，用能譜儀（EDS）分析截面Mo、O元素含量，用XPS測(cè)定Mo、O元素的價(jià)態(tài)，用X射線衍射儀(XRD)分析相組成，采用極化曲線評(píng)定耐蝕性。結(jié)果表明，微弧氧化電壓隨著Na2MoO4濃度的增加而下降。微弧放電區(qū)溫度高于1823.84 K時(shí)，MoO開(kāi)始轉(zhuǎn)變形成MoO2，抑制了微弧氧化膜表面多孔層的形成，提高了膜層的致密性、厚度和耐蝕性。濃度的改變對(duì)相組成影響較小。

    Abstract:

    In order to research the Na2MoO4 modifying mechanism of micro-arc oxidation (MAO) coating on ZL108 aluminum alloy, the alloy was treated by MAO in an electrolyte with Na2MoO4 addition of 5 kinds of concentration. Surface morphologies, Mo and O elements content on cross-section of MAO coating, valence state of Mo and O element, phase composition and corrosion resistance of MAO coating were analyzed by SEM, EDS, XPS, XRD and polarization curve, respectively. The results show that the oxidation voltage declines with the Na2MoO4 concentration increasing. The MoO42- begins to transform to MoO2 when the temperature of micro-arc discharges area is above 1823.84 K, and MoO2 strains the formation of porous coating on the surface of MAO coating. Therefore, the compactness, thickness and corrosion resistance of MAO coating are improved. In addition, the effect of Na2MoO4 concentration on the phase composition of MAO coating is not obvious.

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王 平,郭小陽(yáng),梁 奇. ZL108鋁合金微弧氧化膜的Na2MoO4改性機(jī)理[J].稀有金屬材料與工程,2015,44(5):1191~1196.[Wang Ping, Guo Xiaoyang, Liang Qi. Na2MoO4 Modifying Mechanism of Micro-arc Oxidation Coating on ZL108 Aluminum Alloy[J]. Rare Metal Materials and Engineering,2015,44(5):1191~1196.]
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  • 收稿日期:2014-05-13
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  • 在線發(fā)布日期: 2015-06-08
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