含石墨微粒电解液电流密度对ZL108微弧氧化膜层特性的影响（英文）
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摘要
在含石墨微粒的硅酸钠电解液中,采用不同的电流密度(1, 5, 10,15和20 A/dm~2)在ZL108铝合金上制备了微弧氧化(MAO)膜层。利用SEM、EDS、XRD、涡流测厚仪和显微硬度计对微弧氧化膜层的特性进行了研究。结果表明,随着电流密度的增加,微弧氧化膜层的增厚导致氧化电压增加。微弧氧化膜表面多孔,微孔的直径和烧结盘尺寸逐渐增加。膜层表面C、Si元素的相对含量随电流密度增加而增多,C元素在膜层表面呈均匀分布,膜层截面C元素主要集中在膜层外侧。膜层主要由SiC, SiO_2,θ-Al_2O_3,α-Al_2O_3组成, SiC相来源于石墨与SiO_2反应。随电流密度增大,膜层硬度增加。膜层耐蚀性呈先升高后降低的趋势,并在5 A/dm~2时膜层腐蚀速率最低。
Micro-arc oxidation(MAO) coatings were prepared on ZL108 aluminum alloy in the Na_2SiO_3 electrolyte containing graphite micro-particles at different current densities(1, 5, 10, 15 and 20 A/dm~2). The characteristics of MAO coatings were studied by SEM, EDS, XRD, eddy-current thickness meter and micro-hardness tester. The results show that the thickening of MAO coatings leads to an increase in the oxidation Al_2O_3oltages with the increase of current density. The surface of the MAO coatings appears to be porous. The diameter of micropores and the size of sintering discs gradually increase. The relatiAl_2O_3e contents of C and Si elements on the surface of MAO coatings increase with increasing the current density. The C element is uniformly distributed on the surface of MAO coatings. The C element in the cross-section of MAO coatings is mainly concentrated on outer side. MAO coatings mainly consist of SiC, SiO_2, θ-Al_2O_3 and α-Al2 O3. The SiC phase is deriAl_2O_3ed from the reaction of SiO_2 with graphite. With the increase of current density, the MAO coating hardness increases. MAO coatings prepared at 5 A/dm~2 exhibit the lowest corrosion rate.
Micro-arc oxidation(MAO) coatings were prepared on ZL108 aluminum alloy in the Na_2SiO_3 electrolyte containing graphite micro-particles at different current densities(1, 5, 10, 15 and 20 A/dm~2). The characteristics of MAO coatings were studied by SEM, EDS, XRD, eddy-current thickness meter and micro-hardness tester. The results show that the thickening of MAO coatings leads to an increase in the oxidation Al_2O_3oltages with the increase of current density. The surface of the MAO coatings appears to be porous. The diameter of micropores and the size of sintering discs gradually increase. The relatiAl_2O_3e contents of C and Si elements on the surface of MAO coatings increase with increasing the current density. The C element is uniformly distributed on the surface of MAO coatings. The C element in the cross-section of MAO coatings is mainly concentrated on outer side. MAO coatings mainly consist of SiC, SiO_2, θ-Al_2O_3 and α-Al2 O3. The SiC phase is deriAl_2O_3ed from the reaction of SiO_2 with graphite. With the increase of current density, the MAO coating hardness increases. MAO coatings prepared at 5 A/dm~2 exhibit the lowest corrosion rate.
引文
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2 Wang P,Wu T,Xiao Y T et al.Materials Letters[J],2016,182:27
3 Goto H,Uchijo K.Wear[J],2005,259:613
4 Huang C A,Chang J H,Chen C Y et al.Thin Solid Films[J],2013,544:69
5 Hui Y,Ming P S.Hot Working Technology[J],2008,37(23):105(in Chinese)
6 Xue W B,Shi X L,Hua M et al.Applied Surface Science[J],2007,253(14):6118
7 Zhu L J,Guo Z X,Zhang Y F et al.Electrochimica Acta[J],2016,208:296
8 Jin J,Zhang W,Li H.Materials Technology[J],2016,32(12):707
9 Hu C J,Hsieh M H.Surface and Coatings Technology[J],2014,258:275
10 Xiang N,Song R,Zhuang J et al.Transactions of Nonferrous Metals Society of China[J],2016,26(3):806
11 Ezhilselvi V,Nithin J,Balaraju J N et al.Surface and Coatings Technology[J],2016,288:221
12 Wang P,Wu T,Xiao Y T et al.Journal of Materials Engineering and Performance[J],2016,25(9):3972
13 Vatan H N,kahrizsangi R E,Asgarani M K.Journal of Alloys and Compounds[J],2016,683:241
14 He D,Li G,Shen D et al.Vacuum[J],2014,107:99
15 Guo H F,An M Z,Huo H B et al.Applied Surface Science[J],2006,252(22):7911
16 Ma K J,Bosta M M S A,Wu W T.Surface and Coatings Technology[J],2014,259:318
17 Lv G H,Chen H,Gu W C et al.Current Applied Physics[J],2009,9(2):324
18 Sarbishei S,Sani M A F,Mohammadi M R.Vacuum[J],2014,108:12
19 Durdu S,Usta M.Applied Surface Science[J],2012,261:774
20 Luo X,Robin J C,Yu S.Nuclear Engineering and Design[J],2004,227(3):273
21 Wang Y Q,Wang Y,Chen P M et al.Acta Metallurgica Sinica[J],2011,47(4):455(in Chinese)
22 Dai J X,Sha J J,Zhang Z F et al.Ceramics International[J],2015,41(8):9637
23 Lee K M,Lee B U,Yoon S I et al.Electrochimica Acta[J],2012,