王淑艳,夏永平,刘莉

• 1:江苏科技大学江苏省先进焊接技术重点实验室

摘要(Abstract)：

在Na2SiO3和NaAlO2为主成膜剂的硅铝复合电解液中,利用交流脉冲电源对AZ91D镁合金进行微弧氧化处理,研究主成膜剂含量的变化对微弧氧化过程及膜层特性的影响规律。利用扫描电镜(SEM)和膜层测厚仪分别研究了膜层的微观形貌和膜层厚度,通过电化学阻抗谱(EIS)测试膜层在3.5%NaCl中性溶液中的耐蚀性能。结果表明,随着主成膜剂含量的增加,微弧氧化过程中起弧电压和终止电压均呈下降的变化趋势,而膜层耐蚀性则基本呈先增大后降低的变化趋势,膜厚的变化趋势与其耐蚀性一致;Na2SiO3含量的变化对膜层内部致密层和外部疏松层的耐蚀性均有影响,而NaAlO2含量的变化则主要影响膜层内部致密层的耐蚀性;适量的主成膜剂含量是获得致密耐蚀膜层的关键。

关键词(KeyWords)： 镁合金;微弧氧化;电解质;耐蚀性能

Abstract:

Keywords:

基金项目(Foundation): 江苏高校优势学科建设工程资助项目(35061101)

作者(Author): 王淑艳,夏永平,刘莉

DOI: 10.13289/j.issn.1009-6264.2012.09.026

参考文献(References)：

• [1]Gray J E,Luan B.Protective coatings on magnesium and its alloys-a critical review[J].Journal of Alloys and Compounds,2002,336(1-2):88-113.
• [2]Yang K H,Ger M D,Hwu W H,et al.Study of vanadium-based chemical conversion coating on the corrosion resistance of magnesium alloy[J].Materials Chemistry and Physics,2007,101(2-3):480-485.
• [3]WU Li-ping,ZHAO Jing-jing,XIE Yong-ping,et al.Progress of electroplating and electroless plating on magnesium alloy[J].Transactions ofNonferrous Metals Society of China,2010,20(S2):s630-s637.
• [4]LIU Yan,WEI Zhong-ling,YANG Fu-wei,et al.Environmental friendly anodizing of AZ91D magnesium alloy in alkaline borate-benzoate electrolyte[J].Journal of Alloys and Compounds,2011,509(22):6440-6446.
• [5]Yerokhin A L,Nie X,Leyland A,et al.Plasma electrolysis for surface engineering[J].Surface and Coatings Technology,1999,122(2-3):73-93.
• [6]王淑艳,夏永平,陆正萍,等.电解液组分对AZ91D镁合金微弧氧化膜层耐蚀性的影响[J].中国表面工程,2011,24(5):38-44.WANG Shu-yan,XIA Yong-ping,LU Zheng-ping,et al.Effects of constitutes of electrolyte on the corrosion resistance of the coating fabricated onAZ91D magnesium alloy[J].China Surface Engineering,2011,24(5):38-44.
• [7]Liang J,Bala Srinivasan P,Blawert C,et al.Comparison of electrochemical corrosion behaviour of MgO and ZrO2 coatings on AM50 magnesium alloyformed by plasma electrolytic oxidation[J].Corrosion Science,2009,51(10):2483-2492.
• [8]Bala Srinivasan P,Blawert C,Dietzel W.Dry sliding wear behaviour of plasma electrolytic oxidation coated AZ91 cast magnesium alloy[J].Wear,2009,266(11-12):1241-1247.
• [9]Emrah C,Tekin K C,Malayoglu U,et al.The effect of substrate composition on the electrochemical and mechanical properties of PEO coatings on Mgalloys[J].Surface and Coatings Technology,2010,204(8):1305-1313.
• [10]Tang Y M,Zhao X H,Jiang K S,et al.The influences of duty cycle on the bonding strength of AZ31B magnesium alloy by microarc oxidation treatment[J].Surface and Coatings Technology,2010,205(6):1789-1792.
• [11]Gnedenkov S V,Khrisanfova O A,Zavidnaya A G,et al.PEO coatings obtained on an Mg-Mn type alloy under unipolar and bipolar modes in silicate-containing electrolytes[J].Surface and Coatings Technology,2010,204(14):2316-2322.
• [12]Zhang R F,Zhang S F,Duo S W.Influence of phytic acid concentration on coating properties obtained by MAO treatment on magnesium alloys[J].Applied Surface Science,2009,255(18):7893-7897.
• [13]郭峰,刘瑞霞,李鹏飞,等.电解液中的稀土对AZ91D镁合金微弧氧化陶瓷层的影响[J].材料热处理学报,2011,32(2):134-138.GUO Feng,LIU Rui-xia,LI Peng-fei,et al.Effect of rare earth elements in electrolyte on ceramic coating prepared by micro-arc oxidation on AZ91Dmagnesium alloy[J].Trans Mater Heat Treatment,2011,32(2):134-138.
• [14]ZHAO Fang,LIAO Ai-di,ZHANG Rong-fa,et al.Effects of sodium tungstate on properties of micro-arc coatings on magnesium alloys[J].TransNonferrous Met Soc China,2010,20(S2):s683-s687.
• [15]WANG Li,CHEN Li,YAN Zong-cheng,et al.Effect of potassium fluoride on structure and corrosion resistance of plasma electrolytic oxidation filmsformed on AZ31 magnesium alloy[J].Journal of Alloys and Compounds,2009,480(2):469-474.
• [16]蒋兆华,李爽,姚忠平,等.电解液对微弧氧化陶瓷膜结构与耐蚀性的影响[J].材料科学与工艺,2006,14(5):460-462.JIANG Zhao-hua,LI Shuang,YAO Zhong-ping,et al.Effect of electrolytes on structure and corrosion resistance of micro arc oxidation ceramic coatings[J].Materials Science&Technology,2006,14(5):460-462.
• [17]陈显明,罗承萍,刘江文,等.镁合金微弧氧化膜层形成过程探讨[J].中国表面工程,2006,19(5):14-18.CHEN Xian-ming,LUO Cheng-ping,LIU Jiang-wen,et al.Discussion of growth process of micro-arc oxidation film on magnesium alloys[J].ChinaSurface Engineering,2006,19(5):14-18.
• [18]Duan H P,Yan C W,Wang F H.Effect of electrolyte additives on performance of plasma electrolytic oxidation films formed on magnesium alloyAZ91D[J].Electrochimica Acta,2007,52(11):3785-3793.
• [19]骆海贺,蔡启舟,魏伯康,等.(NaPO3)6对AZ91D镁合金微弧氧化陶瓷层电化学腐蚀特性的影响[J].物理化学学报,2008,24(3):481-486.LUO Hai-he,CAI Qi-Zhou,WEI Bo-kang,et al.Effects of(NaPO3)6 on electrochemical corrosion characteristic of micro-arc oxidation ceramiccoatings formed on AZ91D Mg alloy[J].Acta Phys Chim Sin,2008,24(3):481-486.
• [20]张荣发,曲铁平,巢强花,等.环保型电解质对镁合金氧化膜性能的影响[J].中国有色金属学报,2008,18(6):1027-1031.ZHANG Rong-fa,QU Tie-ping,CHAO Qiang-hua,et al.Effects of environmentally friendly electrolytes on properties of anodic coatings formed onmagnesium alloys[J].The Chinese Journal of Nonferrous Metals,2008,18(6):1027-1031.
• [21]王虹斌,方志刚,蒋百灵.微弧氧化技术及其在海洋环境中的应用[M].北京:国防工业出版社,2010.

文章评论(Comment)：