AZ91镁合金表面微弧氧化膜微观结构的TEM表征
Characterization of Microstructure of Micro-arc Oxidation Coating on AZ91 Magnesium Alloy Surface Using Transmission Electron Microscopy
摘 要
在硅酸盐碱性电解液中, 以AZ91镁合金为基体采用恒电流控制模式制备出微弧氧化陶瓷薄膜, 采用透射电镜对微弧氧化膜的微观结构进行了分析, 并测试了相关性能。结果表明: 镁合金在以硅酸盐溶液为主的电解液中进行微弧氧化形成的产物主要是纳米晶MgO和MgAl2O4, 并且形成了少量的非晶态物质和一定比例的较粗大MgO、MgAl2O4和MgSiO3晶粒, 但这些粗大晶粒尺寸也在100~300 nm之间; 形成的晶粒之所以如此细小主要是由于微弧氧化过程是一个快速烧结和快速冷凝的过程; 制备的氧化膜在中性盐雾36 h后的腐蚀率小于0.09 g·cm-2·d-1, 而显微硬度在1 000 HV以上。
微弧氧化膜
透射电镜
magnesium alloy
micro-arc oxidation coating
TEM
Abstract
Micro-arc oxidation(MAO) ceramic coating was formed on the AZ91 magnesium alloy substrate in silicate alkaline electrolytic solution employing a constant-current controlled mode, and the microstructure of the MAO coating was analyzed using transmission electron microscopy. The relative properties were also tested. The results show that the products formed during the micro-arc oxidation were mainly nanocrystalline MgO and MgAl2O4 in silicate alkaline electrolytic solution, and a little amorphous substrate and some coarse grains of MgO, MgAl2O4 and MgSiO3 with the size of 100-300 nm. The formation of the fine grains was attributed to that the MAO was a fast sintering and fast cooling process. The corrosion rate of the obtained oxide layer in the neutral salt atmosphere for 36 h was less than 0.09 g·cm-2·d-1, and the microhardness was above 1 000 HV.
中图分类号 TG146
所属栏目
基金项目 广东省科技工业攻关项目(2003C103013)
收稿日期 2009/12/20
修改稿日期 2010/10/5
网络出版日期
作者单位点击查看
备注陈显明(1975-), 男, 广西贵港人, 副教授, 博士。
引用该论文: CHEN Xian-ming,LUO Cheng-ping,LIU Jiang-wen. Characterization of Microstructure of Micro-arc Oxidation Coating on AZ91 Magnesium Alloy Surface Using Transmission Electron Microscopy[J]. Materials for mechancial engineering, 2011, 35(2): 58～62
陈显明,罗承萍,刘江文. AZ91镁合金表面微弧氧化膜微观结构的TEM表征[J]. 机械工程材料, 2011, 35(2): 58～62
被引情况:
【1】郭惠霞,马颖,董海荣,张玉福,郝远, "镁合金微弧氧化膜在乙二醇水溶液中的腐蚀行为",机械工程材料 37, 42-47(2013)
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参考文献
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【4】郝建民, 陈宏, 张荣军, 等.镁合金微弧氧化陶瓷层的耐蚀性[J].中国有色金属学报, 2003, 13(4):988-991.
【5】LIANG Jun, WANG Peng, HU Li-tian, et al. Tribological properties of duplex MAO/DLC coatings on magnesium alloy using combined microarc oxidation and filtered. cathodic arc deposition[J].Mater Sci Eng A, 2007, 454/455:164-169.
【6】JIN Fan-ya, CHU P K, XUA Gui-dong, et al. Structure and mechanical properties of magnesium alloy treated by micro-arc discharge oxidation using direct current and high-frequency bipolar pulsing modes[J].Mater Sci Eng A, 2006, 435/436:123-126.
【7】陈星宇, 赵中伟, 陈爱良, 等.钛金属表面微弧氧化的电击穿行为[J].华南理工大学学报:自然科学版, 2009, 37(8):145-149.
【8】BARCHICHE C E, ROCCA E, JUERS C, et al. Corrosion resis-tance of plasma-anodized AZ91D magnesium alloy by electrochemical methods[J].Electrochimica Acta, 2007, 53:417-425.
【9】VAN T B, BROWN S D, WIRTZ G P. Mechanism of anodic spark deposition[J].Am Ceram Soc Bull, 1977, 56(6):563-566.
【10】KRYSMANN W, KURZE P, DITTRICH K H, et al. Process characteristics and parameters of anodic oxidation by spark discharge(ANOF)[J].Cryst Res Techol, 1984, 19(7):973-979.
【11】YEROKHIN A L, NIE X, LEYLAND A, et al. Plasma electrolysis for surface engineering[J].Surface and Coatings Technology, 1999, 122:73-93.
【12】王倩, 李青春, 常国威.快速凝固技术的发展现状与展望[J].辽宁工学院学报, 2003, 23(5):40-44.
【13】LAURENS K, FRED D. Rapidly solidified aluminium alloys by meltspinning[J].Materials Science and Engineering A, 2004, 375/377:1212-1216.
【14】MAKOTO S, SATOSHI H, JUNICHI K. Structures and mechanical properties of rapidly solidified Mg-Y based alloys[J].Materials Science and Engineering A, 1997, 226/228:861-866.
【15】陈显明, 罗承萍, 刘江文, 等.镁合金微弧氧化膜层结构[J].中南大学学报:自然科学版, 2006, 37(6): 1065-1069.
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