一种AZ80铸造镁合金用高效微弧氧化工艺
An Efficient Micro-arc Oxidation Technology for AZ80 As-cast Magnesium Alloy
摘 要
开发了一种适用于AZ80铸造镁合金的高效微弧氧化处理方法和相关的电解液，可将传统的微弧氧化处理时间缩短至3 min，且能够在AZ80镁合金表面制备出一层耐蚀性良好的氧化物陶瓷膜。利用扫描电镜（SEM）、能谱仪（EDS）、X射线衍射仪（XRD）等对AZ80镁合金表面的氧化物陶瓷膜结构进行了表征；并利用盐雾腐蚀试验、电化学试验等研究了陶瓷层的耐蚀性及其腐蚀过程。结果表明：经过3 min微弧氧化处理后，AZ80镁合金表面形成了6 μm厚的氧化物陶瓷膜，其主要成分为氧化镁、硅酸镁和偏铝酸镁；覆盖氧化物陶瓷膜的AZ80镁合金的耐蚀性与基体相比提高了超过4个数量级，且在长周期5%中性盐雾腐蚀试验中表现出良好的耐蚀性。
镁合金
氧化膜
陶瓷层
腐蚀
micro-arc oxidation
magnesium alloy
oxide film
ceramic layer
corrosion
Abstract
A highly efficient micro-arc oxidation treatment method and relevant electrolyte were developed for AZ80 as-cast magnesium alloy. The traditional micro-arc oxidation treatment time was shortened to 3 min, and an oxide ceramic film with good corrosion resistance was prepared on the surface of AZ80 magnesium alloy. The structure of oxide ceramic membrane on the surface of AZ80 magnesium alloy was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The corrosion resistance and corrosion process of the ceramic layer were studied by salt spray corrosion test and electrochemical test. The results showed that after 3 min micro-arc oxidation treatment, a 6 μm thick ceramic film was formed on the surface of AZ80 magnesium alloy, and the main components of the film were magnesia, magnesium silicate and magnesium meta-aluminate. The corrosion resistance of the AZ80 magnesium alloy covered by a ceramic oxide film was improved by more than 4 orders of magnitude compared with the matrix, and exhibitted good corrosion resistance in the long-period 5% neutral salt spray corrosion test.
中图分类号 TG178 DOI 10.11973/fsyfh-201811010
所属栏目 应用技术
基金项目 国家重点研发计划课题（2016YFB0301105）；国家重点研发计划（2017YFB0103904）；山东省重点研发计划项目（2016ZDJS02A09）
收稿日期 2017/7/11
修改稿日期
网络出版日期
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引用该论文: ZHOU Jixue,CHEN Yanfei,SONG Xiaocun,LIU Hongtao,WANG Meifang,YANG Yuansheng. An Efficient Micro-arc Oxidation Technology for AZ80 As-cast Magnesium Alloy[J]. Corrosion & Protection, 2018, 39(11): 860
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【3】CUI X J,LI M T,YANG R S,et al. Structure and properties of a duplex coating combining micro-arc oxidation and baking layer on AZ91D Mg alloy[J]. Applied Surface Science,2016,363:91-100.
【4】薛文斌,陈廷芳,李永良,等. AZ31镁合金搅拌摩擦焊接头微弧氧化表面防护研究[J]. 材料工程,2013(12):1-6.
【5】XIONG Y,HU Q,SONG R,et al. LSP/MAO composite bio-coating on AZ80 magnesium alloy for biomedical application[J]. Materials Science and Engineering:C,2017,75:1299-1304.
【6】TAN C,ZHU H,KUANG T,et al. Laser cladding Al-based amorphous-nanocrystalline composite coatings on AZ80 magnesium alloy under water cooling condition[J]. Journal of Alloys and Compounds,2017,690:108-115.
【7】鲁亮,薛文斌,金小越,等. 5083铝合金搅拌摩擦焊接头微弧氧化膜电化学腐蚀行为[J]. 稀有金属材料与工程,2012(9):1597-1601.
【8】YANG W,WANG J,XU D,et al. Microstructure and properties of duplex coatings on magnesium alloy[J]. Surface Engineering,2016,32(8):601-606.
【9】GOLSHIRAZI A,KHARAZIHA M,GOLOZAR M A. Polyethylenimine/kappa carrageenan:micro-arc oxidation coating for passivation of magnesium alloy[J]. Carbohydrate Polymers,2017,167:185-195.
【10】PAKSOY A H,MUHAFFEL F,KOCA M,et al. Formation of a corrosion-resitance alumina coating on a 6061 aluminum alloy using a combination of micro-arc oxidation and sealing treatments[J]. Material in Tehnology,2017,51(1):117-121.
【11】FIDAN S,MUHAFFEL F,RIOOL M,et al. Fabrication of oxide layer on zirconium by micro-arc oxidation:structural and antimicrobial characteristics[J]. Materials Science and Engineering:C,2017,71:565-569.
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【13】TANG H,GAO Y. Preparation and characterization of hydroxyapatite containing coating on AZ31 magnesium alloy by micro-arc oxidation[J]. Journal of Alloys and Compounds,2016,688:699-708.
【14】HUI J Z. The study of ceramic on aluminum-magnesium alloy surface treated by micro-arc oxidation under different electrical parameters[D]. Xi'an:Chang'an University,2006.
【15】蒋百灵,张先锋. 镁合金微弧氧化陶瓷层的生长过程及其耐蚀性[J]. 中国腐蚀与防护学报,2009,25(2):97-101.
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【17】CHEN Y,ZHOU J,LIU H,et al. Overall micro-arc oxidation treatment for AZ31B-6061 magnesium-aluminium dissimilar metal connecting parts[J]. Corrosion Engineering,Science and Technology,2017(6):470-475.
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【20】ZHANG Z,ZHANG Y,ZHANG L,et al. Application of micro-arc oxidation technology in die magnesium alloy wheels in mass production[J]. Key Engineering Materials,2016,667:15.
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【23】TANG H,HAN Y,WU T,et al. Synthesis and properties of hydroxyapatite-containing coating on AZ31 magnesium alloy by micro-arc oxidation[J]. Applied Surface Science,2017,400:391-404.
【24】CUI L Y,GAO S D,LI P P,et al. Corrosion resistance of a self-healing micro-arc oxidation/polymethyltrimethoxysilane composite coating on magnesium alloy AZ31[J]. Corrosion Science,2017,118:84-95.
【25】CUI X,YANG R,LIU C,et al. Structure and corrosion resistance of modified micro-arc oxidation coating on AZ31B magnesium alloy[J]. Transactions of Nonferrous Metals Society of China,2016,26(3):814-821.
【26】LALEH M,KARGAR F,ROUHAGHDAM A S. Investigation of rare earth sealing of porous micro-arc oxidation coating formed on AZ91D magnesium alloy[J]. Journal of Rare Earths,2012,30(12):1293-1297.
【27】郭惠霞. 镁合金微弧氧化膜电化学腐蚀行为及机理研究[D]. 兰州:兰州理工大学,2014.
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