工艺参数对铝合金微弧氧化膜层蛇纹石含量的影响
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摘要
为探究工艺参数对铝合金微弧氧化膜层中蛇纹石含量的影响,采用微弧氧化技术,分别在双向恒压、单向恒压和单向恒流模式下,在添加蛇纹石微纳米颗粒的电解液中进行试验,在ZL109铝合金表面原位生长陶瓷层。采用SEM、EDS及XRD对膜层进行分析。结果表明:在单向恒压和单向恒流模式下制得的微弧氧化膜层的蛇纹石含量相比双向恒压模式分别提高了92%和113%;微弧氧化膜层中的蛇纹石含量随电流的增加而增加,随频率的增加而降低,随电解液中蛇纹石微纳米颗粒浓度的增加而增加;试验过程中试样与电解槽之间的电场产生的电泳效应,使得在电解液中呈电负性的蛇纹石微纳米颗粒移动到试样表面,在接触到试样表面熔融态的高温氧化物时,蛇纹石微纳米颗粒表面熔化而粘合在试样表面,经电解液冷却复合到了微弧氧化膜层中。
In order to investigate the effects of process parameters on the content of serpentine in the micro-arc oxidation(MAO) coatings on aluminum alloy, the ceramic coatings on the ZL109 aluminium alloy surface were prepared by the MAO process in the electrolyte adding serpentine micro-nano particles under bidirectional constant voltage, unidirectional constant voltage and unidirectional constant current mode, respectively. The MAO coatings obtained were analyzed by SEM, EDS and XRD. The results show that the content of serpentine in the MAO coatings prepared by unidirectional constant voltage and unidirectional constant current mode increases by 92% and 113%, compared with the coatings that prepared by the bidirectional constant voltage mode. The content of serpentine in the MAO coatings increases with the increase of the current,decreases with the increase of the frequency, and increases with the increase of the concentration of the serpentine micro-nano particles in the electrolyte. The electronegative serpentine micro-nano particles in the electrolyte move to the surface of the sample due to the electrophoretic effect produced by the electric field between the sample and the electrolytic tank during the test, and its surface is melted and conglutinated to the surface of the sample when exposed to high temperature oxide on the surface of the sample, then it is cooled by the electrolyte and incorporate into the MAO coatings.
In order to investigate the effects of process parameters on the content of serpentine in the micro-arc oxidation(MAO) coatings on aluminum alloy, the ceramic coatings on the ZL109 aluminium alloy surface were prepared by the MAO process in the electrolyte adding serpentine micro-nano particles under bidirectional constant voltage, unidirectional constant voltage and unidirectional constant current mode, respectively. The MAO coatings obtained were analyzed by SEM, EDS and XRD. The results show that the content of serpentine in the MAO coatings prepared by unidirectional constant voltage and unidirectional constant current mode increases by 92% and 113%, compared with the coatings that prepared by the bidirectional constant voltage mode. The content of serpentine in the MAO coatings increases with the increase of the current,decreases with the increase of the frequency, and increases with the increase of the concentration of the serpentine micro-nano particles in the electrolyte. The electronegative serpentine micro-nano particles in the electrolyte move to the surface of the sample due to the electrophoretic effect produced by the electric field between the sample and the electrolytic tank during the test, and its surface is melted and conglutinated to the surface of the sample when exposed to high temperature oxide on the surface of the sample, then it is cooled by the electrolyte and incorporate into the MAO coatings.
引文
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[3]YUREKT(U|¨)RK Y,MUHAFFEL F,BAYDOGAN M.Characterization of micro arc oxidized 6082 aluminum alloy in an electrolyte containing carbon nanotubes[J].Surface&Coatings Technology,2015,269(7):83-90.
[4]WANG P,WU T,XIAO Y T,et al.Effect of Al_2O_3 micropowder additives on the properties of micro-arc oxidation coatings formed on 6061 aluminum alloy[J].Journal of Materials Engineering&Performance,2016,25(9):1-5.
[5]MORI Y,KOSHI A,LIAO J,et al.Characteristics and corrosion resistance of plasma electrolytic oxidation coatings on AZ31B Mg alloy formed in phosphate-silicate mixture electrolytes[J].Corrosion Science,2014,88(16):254-262.
[6]LU X P,BLAWERT C L,ZHELUDKEVICH M,et al.Insights into plasma electrolytic oxidation treatment with particle addition[J].Corrosion Science,2015,101(6):201-207.
[7]LV G H,CHEN H,GU W C,et al.Effects of graphite additives in electrolytes on the microstructure and corrosion resistance of alumina PEO coatings[J].Current Applied Physics,2009,9(2):324-328.
[8]索相波,邱骥,刘吉延.电解液中添加纳米Si02对7A52铝合金表面微弧氧化陶瓷层生长过程及性能的影响[J].中国表面工程,2010,23(3):42-45.SUO X B,QIU J,LIU J Y.Effects of SiO_2 nanoparticles in electrolytes on growth process and surface properties of alumina coatings formed on 7A52 aluminium alloy by microarc oxidation[J].China Surface Engineering,2010,23(3):42-45(in Chinese).
[9]ALIOFKHAZRAEI M,SABOUR A S,SHAHRABI T,et al.Abrasive wearbehavior of Si3N4/TiO_2 nanocomposite coatings fabricated by plasma electrolytic oxidation[J].Surface&Coatings Technology,2010,205(7):41-46.
[10]SHIN K R,KIM Y S,KIM G W,et al.Effects of concentration of Ag nanoparticles on surface structure and in vitro biological responses of oxide layer on pure titanium via plasma electrolytic oxidation[J].Applied Surface Science,2015,347(30):574-582.
[11]LI H X,SONG R G,JI Z G.Effects of nano-additive Ti02on performance of micro-arc oxidation coatings formed on6063 aluminum alloy[J].Transactions of Nonferrous Metals Society of China,2013,23(2):406-411.
[12]LU X P,BLAWERT C,HUANG Y,et al.Plasma electrolytic oxidation coatings on Mg alloy with addition of SiO_2particles[J].Electrochim Acta,2016,187(1):20-33.
[13]MU M,LIANG J,ZHOU X,et al.One-step preparation of TiO_2/MoS_2 composite coating on Ti_6Al_4V alloy by plasma electrolytic oxidation and its tribological properties[J].Surface&Coatings Technology,2013,214(2):124-130.
[14]SHIN K R,KO Y G,DONG H S.Surface characteristics of ZrO_2-containing oxide layer in titanium by plasma electrolytic oxidation in K_4P_2O_7 electrolyte[J].Journal of Alloys and Compounds,2012,536(1):226-230.
[15]SHOKOUHFAR M,ALLAHKARAM S R.Formation mechanism and surface characterization of ceramic composite coatings on pure titanium prepared by micro arc oxidation in electrolytes containing nanoparticles[J].Surface&Coatings Technology,2016,291(13):396-405.
[16]LU X P,BLAWERT C,MOHEDANO M,et al.Influence of electrical parameters on particle uptake during plasma electrolytic oxidation processing of AM50 Mg alloy[J].Surface&Coatings Technology,2016,289(6):179-185.
[17]丁鹏.磷酸盐对蛇纹石的分散作用研究[D].长沙:中南大学,2011.DING P.Effect of phosphates on the dispersing of serpentine[D].Changsha:Central South University,2011(in Chinese).
[18]夏启斌,李忠,邱显扬,等.六偏磷酸钠对蛇纹石的分散机理研究[J].矿冶工程,2002,22(2):51-54.XIA Q B,LI Z,QIU X Y,et al.Investigation of action mechanism between sodium hexametaphosphate and serpentine[J].Mining and Metallurgical Engineering,2002,22(2):51-54(in Chinese).
[19]葛延峰,蒋百灵,时惠英.电流脉冲宽度对铝合金微弧氧化过程的影响[J].材料热处理学报,2013,34(10):165-169.GE Y F,JIANG B L,SHI H Y.Effect of current pulse width on micro-arc oxidation process for aluminum alloy[J].Transactions of Materials and Heat Treatment,2013,34(10):165-169(in Chinese).
[20]李合.以蛇纹石为原料制备陶瓷涂层的实验研究[D].北京:中国地质大学,2006.LI H.Study on the preparation of ceramic-coat with the serpentine[D].Beijing:China University of Geosciences,2006(in Chinese).