Effect of Graphene Additive on Microstructure and Properties of MAO Ceramic Coatings Formed on 7050 Aluminum Alloy

doi:10.3969/j.issn.1000-1093.2020.06.018

Abstract

Abstract: For the corrosion and wear of 7050 high strength aluminum alloy in the marine environment, an excellent coating structure is designed to prolong its service life. The graphene-containing ceramic coating was prepared on the surface of 7050 high strength aluminum alloy by micro-arc oxidation (MAO) in a silicate electrolyte added with different concentrations of graphene. The surface morphology, roughness, phase composition, distribution of elements, bonding force and corrosion resistance of micro-arc oxidation ceramic coating are analyzed by using the scanning electron microscopy (SEM), stereomicroscope, X-ray diffractometer (XRD), X-ray photoelectron spectrometer (XPS), automatic scratch instrument for coating adhesion, electrochemical workstation, respectively. It is shown that the micro-pore size of ceramic coating which mainly consists of α-Al₂O₃, γ-Al₂O₃ decreases and its compactness is obviously improved with the addition of graphene. In addition, the roughness of ceramic coating is the lowest (857.835 nm), its adhesion is the best (46 N), and its corrosion resistance is significantly improved when the concentration of graphene is 10 g/L. The coating has maximum corrosion potential, minimum corrosion current. Key

Key words: 7050highstrengthaluminumalloy, graphemeadditive, ceramiccoating, micro-arcoxidation

CLC Number:

TG174.411

ZONG Yu， SONG Renguo， HUA Tianshun， CAI Siwei. Effect of Graphene Additive on Microstructure and Properties of MAO Ceramic Coatings Formed on 7050 Aluminum Alloy[J]. Acta Armamentarii, 2020, 41(6): 1210-1218.

References

［1］刘继华,李荻,刘培英.热处理对7050铝合金应力腐蚀及断口形貌的影响[J].材料热处理学报, 2010,31(7): 109-113.
LIU J H, LI D, LIU P Y. Effect of heat treatment on stress corrosion behavior of 7050 aluminum alloy[J]. Transactions of Materials and Heat Treatment, 2010,31(7): 109-113. (in Chinese)
[2］郝建民，魏小旖，陈永楠，等.1060铝合金微弧氧化黑色陶瓷膜显色特性及着色处理[J].表面技术，2014，43(1)：44-49.
HAO J M，WEI X Y，CHEN Y N，et al. Color characteristic and formation mechanism of black ceramic coating by micro-arc oxidation on 1060 aluminum alloy[J].Surface Technology, 2014,43(1): 44-49.(in Chinese)
[3］陈小明，宋仁国，李杰.7×××系铝合金的研究现状及发展趋势[J].材料导报，2009，23(2)：67-70.
CHEN X M, SONG R G, LI J.Current research status and development trends of 7××× series aluminum alloys[J]. Material Review，2009，23(2)：67-70. (in Chinese)
[4］宋仁国.微弧氧化技术的发展及应用[J].材料工程，2019,47(3): 50-62.
SONG R G. Development and applications of micro-arc oxidation technology[J]. Journal of Materials Engineering, 2019,47(3):50-62.(in Chinese)
[5］宗玙，宋仁国，花天顺，等.脉冲频率对7050高强铝合金微弧氧化膜层的影响[J].航空学报，2019，40(11):422967.
ZONG Y, SONG R G, HUA T S, et al. Effects of pulse frequency on MAO coatings of AA7050[J]. Acta Aeronautica et Astronautica Sinica,2019，40(11):422967. (in Chinese)
[6］ HENRY HOLOROYD N J, SCAMANS G M. Stress corrosion cracking in Al-Zn-Mg-Cu aluminum alloys in saline environment[J]. Metallurgical and Materials Transactions A, 2013, 44(3):1230-1253.
[7］ QI W J, QI X, SUN B, et al. Study on electrochemical corrosion of 7050 aluminum alloy[J]. Materials Performance, 2017, 56(11): 58-61.
[8］ FADEE H, JAVIDI M. Investigation on the corrosion behaviour and microstructure of 2024-T3 Al alloy treated via plasma electrolytic oxidation[J]. Journal of Alloys and Compounds, 2014, 604:36-42.
[9］庄俊杰，张晓燕，孙斌，等. 微弧氧化对7050铝合金腐蚀行为的影响[J].工程科学学报，2017,39(10)：1532-1539.
ZHUANG J J, ZHANG X Y, SUN B, et al. Micro-arc oxidation coatings and corrosion behavior of 7050 aluminum alloy [J]. Chinese Journal of Engineering, 2017,39(10): 1532-1539. (in Chinese)

[10］李红霞，宋玉苏，王烨瑄，等.石墨烯对Ag/AgCl电极水下电场探测性能的影响研究[J].兵工学报，2019,40(12):2529-2536.
LI H X, SONG Y S, WANG Y X, et al. Effect of graphene modification on the detection performance of Ag/AgCl electrode in undersea electric field [J]. Acta Armamentarii, 2019,40(12): 2529-2536.(in Chinese)
[11］朱枝胜，李文芳，易爱华，等.电解液温度对AZ31B镁合金黑色微弧氧化膜的影响[J].表面技术，2019，48(3)：53-61.
ZHU Z S, LI W F, YI A H, et al. Influence of electrolyte temperature on properties of black MAO coating on AZ31B Mg alloy[J]. Surface Technology, 2019,48(3):53-61.(in Chinese)
[12］马国峰，刘志杨，张丽桌，等.2024铝合金表面陶瓷基氧化膜的制备及性能[J].沈阳大学学报(自然科学版)，2019，31(1): 1-5.
MA G F, LIU Z Y, ZHANG L Z, et al. Preparation and property of 2024 aluminum alloy ceramic oxide film[J]. Journal of Shenyang University (Natural Science), 2019,31(1):1-5.(in Chinese)
[13］ LIU J J, LI R J, LI H, et al. Graphene-based in-plane heterostructures for atomically thin electronics [J]. New Carbon Materials, 2018, 33(6):481-492.
[14］ WATCHAROTONE S, DIKIN D A, STANKOVICH S, et al. Graphene-silica composite thin films as transparent conductors[J]. Nano Letters, 2007,7(7):1888-1892.
[15］ CHEN F, ZHANG Y L, ZHANG Y. Effect of graphene on micro-structure and properties of MAO coating prepared on Mg-Li alloy[J]. International Journal of Electrochemical Science,2017, 12(7): 6081-6091.
[16］唐誉豪，向东，李东豪，等.含石墨烯纳米片电解液中电流密度对2024铝合金微弧氧化膜性能的影响[J].表面技术，2018，47（7）：203-208.
TANG Y H, XIANG D, LI D H, et al. Effects of current density in electrolyte containing graphene on properties of 2024 aluminum alloy micro-arc oxidation coating [J].Surface Technology, 2018,47(7): 203-208. (in Chinese)
[17］ YU H J, DONG Q, DOU J H, et al. Structure and in vitro bioactivity of ceramic coatings on magnesium alloys by micro-arc oxidation [J]. Applied Surface Science, 2016, 338(A):114-119.
[18］王国建，戴进峰，马朗.化学制备石墨烯对环氧树脂导电性的影响[J].同济大学学报(自然科学版), 2014,42(9):1377-1383.
WANG G J, DAI J F, MA L. Influence of graphene prepared by chemical method on epoxy resin electric conductivity[J].Journal of Tongji University (Natural Science), 2014,42(9):1377-1383.(in Chinese)
[19］ FENG C J, HU S L, JIANG Y F, et al. Effects of micro-arc oxidation of Ti6Al4V alloy on adhesion property to electroless Ni-P-ZrO₂ composite platings and their wear resistance[J]. Rare Metal Materials and Engineering, 2013, 42(12):2427-2432.
[20］ XIANG N, SONG R G, WANG C, et al. Formation of corrosion resistant plasma electrolytic oxidation coatings on aluminum alloy with addition of sodium tungstate species[J]. Corrosion Engineering, Science and Technology, 2016,51(2):146-154.

第41卷第6期2020 年6月
兵工学报ACTA ARMAMENTARII
Vol.41No.6Jun.2020