Mg元素对等离子体电解氧化陶瓷层特性的影响  

Effect of magnesium element on character of ceramic coating produced by plasma electrolytic oxidation

作　　者：苗景国[1,2] 郝康达[1] 陈秋荣[3,4] 董香芸[1] 吴润[1] 卫中领[3] 

机构地区：[1]武汉科技大学材料与冶金学院,湖北武汉430081 [2]嘉兴南洋职业技术学院机电工程系,浙江嘉兴314003 [3]中国科学院嘉兴轻合金技术工程中心,浙江嘉兴314006 [4]嘉兴中科亚美合金技术有限责任公司,浙江嘉兴314006

出　　处：《轻合金加工技术》2013年第5期53-57,共5页Light Alloy Fabrication Technology

摘　　要：在Na2SiO3-NaOH电解液体系下,对不同Mg含量的5005、5052、5754及5A05铝合金进行等离子体电解氧化。通过测试陶瓷层厚度及显微硬度,并借助SEM和XRD分析陶瓷层的微观形貌及相组成,对Mg元素的影响进行了研究。结果表明:在w(Mg)<2.5%时,Mg元素对氧化铝的高温转变具有极大的阻碍作用,显微硬度随Mg含量升高而下降;而在w(Mg)>2.5%时,Mg元素在一定程度上表现为促进α-Al2O3的形成,但效果不明显,陶瓷层显微硬度缓慢增加。Plasma electrolytic oxidation on 5005,5052,5754 and 5A05 aluminum alloy with different magnesium content has been produce with Na2 SiO3-NaOH electrolyte. The effect of magnesium content on thickness and micro-hardness of ceramic coatings have been inspected. The effect of magnesium content on phase composition and micro-morphology of ceramic layer have been analyzed by SEM and XRD. Results show that the magnesium ele- ment has great obstruction effects on high temperature transform of aluminum oxide while the magnesium is less than 2.5 % （w）, the micro-hardness decreased with the increasing of Mg content; however, it promoted the formation of cx-A12 03 to a certain degree while magnesium element is higher than 2.5 % （w） , but the effect is not obvious and micro-hardness of ceram- ic layer increased slowly. Key

关 键 词：等离子体电解氧化 铝合金 Mg元素 性能 

分 类 号：TG174.453[金属学及工艺—金属表面处理]