2+MgO微弧氧化膜層的電化學(xué)腐蝕與磨損性能,本文運(yùn)用復(fù)合電介質(zhì)順序放電學(xué)術(shù)思想,通過(guò)減弱擊穿熔體的噴發(fā),使膜層進(jìn)一步致密,進(jìn)而使其性能得到提高。膜層的MgF2-MgO質(zhì)量比率α、微觀組織、電化學(xué)腐蝕與磨損性能的研究結(jié)果表明：α=1.2時(shí),減弱擊穿熔體噴發(fā)的效果顯著好于α=0.1和11.8,膜層的內(nèi)部致密層厚度可提高到3.6 μm,是現(xiàn)有微弧氧化膜層的3倍,外部疏松層的阻抗可提高到13555 Ω cm2,比α=0.1和11.8的大30%。該膜層可將AZ61的自腐蝕電壓Ecorr由-1.912提高到-0.455 VSCE、自腐蝕電流Icorr由378.6減小到0.453(10-6 A/cm2)、磨損率由921降低到0.5(10-5 mm3/N.m)。本研究為制備高性能微弧氧化膜層提供了一種新模式。"/>

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微弧氧化膜層的組分質(zhì)量比率、結(jié)構(gòu)與性能
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北京交通大學(xué)

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中圖分類號(hào):

TG174.41；TG178

基金項(xiàng)目:

大學(xué)生創(chuàng)新創(chuàng)業(yè)訓(xùn)練計(jì)劃資助項(xiàng)目(202010004006)；國(guó)家自然科學(xué)(50974010)；北京市自然科學(xué)(2162036)


Component Mass Ratio, Microstructure and Performance of Micro-arc Oxidation coating
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Fund Project:

the National Training Program of Innovation and Entrepreneurship for Undergraduates (No.202010004006), the National Natural Science Foundation of China (No.50974010) and the Beijing Natural Science Foundation (No.2162036)

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    摘要:

    為了同時(shí)提高AZ61的MgF2+MgO微弧氧化膜層的電化學(xué)腐蝕與磨損性能,本文運(yùn)用復(fù)合電介質(zhì)順序放電學(xué)術(shù)思想,通過(guò)減弱擊穿熔體的噴發(fā),使膜層進(jìn)一步致密,進(jìn)而使其性能得到提高。膜層的MgF2-MgO質(zhì)量比率α、微觀組織、電化學(xué)腐蝕與磨損性能的研究結(jié)果表明：α=1.2時(shí),減弱擊穿熔體噴發(fā)的效果顯著好于α=0.1和11.8,膜層的內(nèi)部致密層厚度可提高到3.6 μm,是現(xiàn)有微弧氧化膜層的3倍,外部疏松層的阻抗可提高到13555 Ω cm2,比α=0.1和11.8的大30%。該膜層可將AZ61的自腐蝕電壓Ecorr由-1.912提高到-0.455 VSCE、自腐蝕電流Icorr由378.6減小到0.453(10-6 A/cm2)、磨損率由921降低到0.5(10-5 mm3/N.m)。本研究為制備高性能微弧氧化膜層提供了一種新模式。

    Abstract:

    In order to improve the electrochemical corrosion and wear performance of MgF2+MgO MAO (micro-arc oxidation) coating on AZ61 simultaneously, composite dielectric ordinal discharge thought was used to weaken the eruption of breakdown melt and hence densify the coating and enhance its performance. α (MgF2-MgO mass ratio), microstructure, electrochemical corrosion and wear performance of coatings were investigated. The results show that the weakening effect on eruption of breakdown melt for coating with α=1.2 is obviously better than that with α=0.1 and 11.8. The thickness of inner dense layer is thickened to 3.6 μm, which is about three times as thick as that of the existing MAO coating. The impedance of outer loose layer is enhanced to 13555 Ω cm2, which is about 30% larger than that of α=0.1 and 11.8. Ecorr (corrosion potential) of AZ61 is increased from -1.912 to -0.455 VSCE, Icorr (corrosion current density) is decreased from 378.6 to 0.453 (10-6 A/cm2) and the wear rate is reduced from 921 to 0.5 (10-5 mm3/N.m) by this densified micro-arc oxidation coating. This investigation provides a novel processing mode for outstanding MAO coating.

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引用本文

張偉一,杜云慧,王玉潔,朱 宇,陸 欽,張 鵬.微弧氧化膜層的組分質(zhì)量比率、結(jié)構(gòu)與性能[J].稀有金屬材料與工程,2021,50(1):311~319.[zhang weiyi, du yunhui, wang yujie, zhu yu, lu qin, zhang peng. Component Mass Ratio, Microstructure and Performance of Micro-arc Oxidation coating[J]. Rare Metal Materials and Engineering,2021,50(1):311~319.]
DOI：10.12442/j. issn.1002-185X.20200067

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  • 收稿日期:2020-02-06
  • 最后修改日期:2020-03-12
  • 錄用日期:2020-03-19
  • 在線發(fā)布日期: 2021-02-05
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