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電壓增幅對鎂合金微弧氧化膜層性能的影響
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甘肅省科技重大專項資助項目(0702GKDA024)


Effects of Voltage Increment on Performances of Micro-Arc Oxidation Coatings of Magnesium Alloys
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    摘要:

    研究了硅酸鹽體系微弧氧化過程中，電源電壓增幅對放電火花形態(tài)及AZ91D鎂合金膜層的厚度、表面形貌和耐蝕性有影響。結(jié)果表明，隨著脈沖電壓增加，電弧的弧斑亮度增強、尺寸變大，但數(shù)目減少，大弧傾向增加；微弧氧化膜層的厚度增厚，但成膜速率降低；膜層表面熔融物顆粒增大，表面孔徑增加，粗糙度增加；腐蝕率呈現(xiàn)出先減小后增加的趨勢。當(dāng)電壓增幅為100~150 V時，其過程穩(wěn)定性、成膜速率、膜層外觀質(zhì)量和耐蝕性等方面的綜合性能相對最優(yōu)。

    Abstract:

    The source voltage increment can influence the shape of arc spark and the thickness, surface morphology and corrosion rate of MAO coatings treated with silicate aqueous solution on AZ91D magnesium alloys. The results reveal that with the voltage increment of supply pulse increasing, the brightness and size of the arc sparks is increased but the amount is decreased accordingly, and the tendency of large arc discharge is intensified; the coating thickness is increased but the film growth rate is decreased; the surface melt grain, microspore size and surface roughness are increased; corrosion rate is first decreased and then increased. The comprehensive performances such as the process stability, film growth rate, coating appearance quality and corrosion resistance are relatively optimum when the voltage increment is within 100-150 V.

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陳 明,馬躍洲,馬 穎,郝 遠(yuǎn).電壓增幅對鎂合金微弧氧化膜層性能的影響[J].稀有金屬材料與工程,2010,39(11):1943~1947.[Chen Ming, Ma Yuezhou, Ma Ying, Hao Yuan. Effects of Voltage Increment on Performances of Micro-Arc Oxidation Coatings of Magnesium Alloys[J]. Rare Metal Materials and Engineering,2010,39(11):1943~1947.]
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  • 收稿日期:2009-12-14
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