(湖南大學(xué) 化學(xué)化工學(xué)院， 長沙 410082)
摘 要: 對含硅量為8%～12%的ZL系列鑄鋁合金的微弧氧化工藝條件、膜層結(jié)構(gòu)以及成膜過程進(jìn)行了研究。結(jié)果表明：采用不對稱交變電壓和在以硅酸鈉為主要成分的復(fù)合電解液體系中，鑄鋁合金表面可獲得一層性能優(yōu)異的微弧氧化膜層。電子能譜(EDS)和X射線衍射(XR D)分析結(jié)果表明微弧氧化膜主要由Al，Si和O元素組成，膜的相結(jié)構(gòu)主要為η-Al2O3，α-Al2O3和SiO2，并含有γ-Al2O3和Mg，W，Cu等元素的氧化物。掃描電鏡(SEM)分析表明微弧氧化膜由致密層(內(nèi)層)和疏松層(外層)構(gòu)成，疏松層表面存在許多氣孔，而致密層完整光滑，具有較高的顯微硬度和優(yōu)異的耐磨耐蝕性能。
關(guān)鍵字: 鑄鋁合金；微弧氧化；膜層性能
aluminum alloys
（College of Chemistry and Chemical Engineering，
Hunan University, Changsha 410082, China）
Abstract:The microarcoxidation (MAO) process and the corresponding film structure and properties of ZL cast aluminum alloys containing 8%～12% of Si were investigated. Using non-symmetric AC potential source, a MAO film with good properties can be obtained on the surface of ZL alloys in mixed electrolyte solutions containing sodium silicate (Na2SiO3). According to the results of energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), the elements of MAO film are Al, Si and O, and the corresponding phase structure are η-Al2O3, α-Al2O3 and SiO2. γ-Al2O3 and oxides of Mg, W and Cu are also observed. Scan electron microscopy(SEM) results show that MAO film can be divided into two layers: compact(inner) and porous (outer) layers. MAO films have high hardness and excellent anti-wearing and anti-corrosion properties.
Key words: cast aluminum alloy；microarcoxidation；film properties
