电参数对2A12铝合金微弧氧化膜组织结构的影响
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摘要
采用微弧氧化技术,在2A12铝合金表面制备致密、平整且晶粒细化的微弧氧化铝陶瓷膜(简称微弧氧化膜)。通过扫描电子显微镜和光学显微镜,对不同电参量条件下制备的微弧氧化膜层的微观形貌和组织结构进行分析。当正电压从220 V增大到280 V,随着正电压的升高,微弧氧化膜表面变得光滑致密,且微弧氧化膜的厚度也随电压升高而增厚;当正电压升高到280 V时,表面有微裂纹出现;随着负电压的升高,微弧氧化膜表面的孔径先增大后减小,膜表面变得光滑;负电压<48 V时,微弧氧化膜的厚度随着负电压的升高而增加,当负电压≥48 V后,微弧氧化膜的厚度减小;随着电流密度增加,微弧氧化膜的厚度增加,但膜表面较粗糙;因此,在微弧氧化处理过程中,正电压、负电压和电流密度对微弧氧化膜的制备均有较大的影响。
The dense,smooth and grain refinements alumina ceramic membrane was obtained on the surface of 2 A12 aluminum alloy by Micro-Arc Oxidation( MAO) technology. The morphology and microstructure of the MAO coatings were analyzed by scanning electron microscopy and optical microscopy morphology under different electrical parameters. When positive voltage was increased from 220 V to 280 V,the micro-arc oxidation coating on the surface became smooth and compact,and the thickness of micro-arc oxidation coatings were thickened with the voltage increased. As the voltage was 280 V,the surface has micro cracks. The pore size of MAO coating on the surface increased firstly,then decreased,membrane surface became smooth with the increase of the negative voltage. When the negative voltage was less than 48 V,the thickness of MAO coating was rised with the increase of negative voltage,as while the negative voltage was greater than 48 V,the thickness of the aluminum oxide ceramic membrane was decreased; however,the MAO coating thickness was increased,the membrane surface was rough as the amount of current density increasing. The results show that positive voltage,negative voltage and current density have significant influence on the preparation of MAO coatings.
The dense,smooth and grain refinements alumina ceramic membrane was obtained on the surface of 2 A12 aluminum alloy by Micro-Arc Oxidation( MAO) technology. The morphology and microstructure of the MAO coatings were analyzed by scanning electron microscopy and optical microscopy morphology under different electrical parameters. When positive voltage was increased from 220 V to 280 V,the micro-arc oxidation coating on the surface became smooth and compact,and the thickness of micro-arc oxidation coatings were thickened with the voltage increased. As the voltage was 280 V,the surface has micro cracks. The pore size of MAO coating on the surface increased firstly,then decreased,membrane surface became smooth with the increase of the negative voltage. When the negative voltage was less than 48 V,the thickness of MAO coating was rised with the increase of negative voltage,as while the negative voltage was greater than 48 V,the thickness of the aluminum oxide ceramic membrane was decreased; however,the MAO coating thickness was increased,the membrane surface was rough as the amount of current density increasing. The results show that positive voltage,negative voltage and current density have significant influence on the preparation of MAO coatings.
引文
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[2] OVUNDUR M,MUHAFFEL F,CIMENOGLU H. Characterization and Tribological Properties of Hard Anodised and Microarc Oxidised 5754 Quality Aluminum Alloy[J]. The Balkan Tribological Association,2016(22):233-239.
[3] CAGATAY OTER Z,GENCER Y,TARAKCI M. The characterization of the coating formed by microarc oxidation on binary Al-Mn alloys[J]. Alloys and Compounds,2015(650):185-192.
[4]沈雁,王红星.凹凸棒土-Ce O2对舰船高温排烟管表面复合镀层组织和抗氧化性能的影响[J].表面技术,2016,45(4):156-161.
[5] GUO Q Q,JIANG B L,LI J P,et al. Corrosion Resistance of Micro-arc Oxidized Ceramic Coating on Cast Hypereutectic Alloy[J]. Transactions of Nonferrous Metals Society of China,2010,20(11):2204-2207.
[6] GUAN Y J,XIA Y,LI G. Growth Mechanism and Corrosion Behavior of Ceramic Coatings on Aluminum Produced by Auto-control AC Pulse PEO[J]. Surf Coat Technol,2008(202):4602-4612.
[7] YEROKHINA A L,SHATROV A,SAMSONO V,et al. Oxide Ceramic Coatings on Aluminium Alloys Produced by a Pulsed Bipolar Plasma Electrolytic Oxidation Process[J].Surface&Coatings Technology,2005(199):150-157.
[8] MA S N,SUO X B,QIU J. Fabrication of n-SiO2Reinforced Al2O3Composites Coatings on 7A52 Aluminum Alloy by Microarc Oxidation[J]. Advanced Materials Research,2010(97/98/99/100/101):1463-1466.
[9]杨钿,周隆先.铝合金微弧氧化技术应用研究[J].表面技术,2013,10(6):131-135.
[10] PAN M Q,CHI G X,WEI D B,et al. Influence of Processing Parameters on Coating Surface Roughness of Aluminum Alloy[J]. Transactions of Nonferrous Metals Society of China,2009,19(S2):392-397.
[11]刘桂香,沈雁.海洋平台结构件表面脉冲纳米复合镀层的制备[J].船舶工程,2014,36(6):81-84.
[12] KRYSMANN W,KURZE P,DITTRICH K H,et al. Process Characteristics and Parameters of Anodic Oxidation by Spark Discharge(ANOF)[J]. Crystal Research and Technology,1984,19(7):973-979.
[13] WANG Ping,WU Ting,PENG Hao. Effect of Na Al O2concentrations on the properties of micro-arc oxidation coatings on pure titanium[J]. Materials Letters,2016(170):171-174.
[14]杨振强,潘明强,狄士春.电流密度对稀土镁合金膜层性能的影响[J].现代制造工程,2011(10):89-92.