Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第12卷    第3期    总第48期    2002年6月

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文章编号:1004-0609(2002)03-0491-05
ZL系列铸铝合金的微弧氧化
罗胜联,周海晖,陈金华,旷亚非

(湖南大学 化学化工学院, 长沙 410082)

摘 要: 对含硅量为8%~12%的ZL系列铸铝合金的微弧氧化工艺条件、膜层结构以及成膜过程进行了研究。结果表明:采用不对称交变电压和在以硅酸钠为主要成分的复合电解液体系中,铸铝合金表面可获得一层性能优异的微弧氧化膜层。电子能谱(EDS)和X射线衍射(XR D)分析结果表明微弧氧化膜主要由Al,Si和O元素组成,膜的相结构主要为η-Al2O3α-Al2O3和SiO2,并含有γ-Al2O3和Mg,W,Cu等元素的氧化物。扫描电镜(SEM)分析表明微弧氧化膜由致密层(内层)和疏松层(外层)构成,疏松层表面存在许多气孔,而致密层完整光滑,具有较高的显微硬度和优异的耐磨耐蚀性能。

 

关键词: 铸铝合金;微弧氧化;膜层性能

Microarc oxidation of ZL cast
aluminum alloys
LUO Sheng-lian, ZHOU Hai-hui, CHEN Jin-hua, KUANG Ya-fei

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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