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为改善氟锆酸盐电解液的老化现象,以氟锆酸盐为主电解液,在其中加入少量NaH2PO4和H3PO4,对AZ31镁合金进行等离子体电解氧化处理,制得氧化锆陶瓷薄膜。用扫描电镜、X射线衍射及能谱分析检测了添加剂对陶瓷薄膜的形貌特征、元素及物相组成的影响。结果表明:添加剂改变了电解液体系的放电特性,能有效抑制氟锆酸盐电解液的老化;添加剂的加入能够提高膜中氧化锆的含量,且降低了F在膜中的含量。制得的氧化锆薄膜能有效提高AZ31镁合金的耐腐蚀性能。
Abstract：In order to improve the aging of fluorozirconate electrolyte,zirconia ceramic coatings were fabricated on AZ31 magnesium alloys by plasma electrolytic oxidation in a potassium fluorozirconate electrolyte solution with sodium dihydrogen phosphate and phosphoric acid as additives.The effects of additives on the surface characteristics,element contents and phase composition of the coatings were investigated by scanning electron microscopy,X-ray diffraction and energy dispersive X-ray spectroscopy.The results indicate that the discharge characteristics of the electrolyte system are changed by additives,which can effectively restrain the aging of the potassium fluorozirconate electrolyte.The amount of ZrO2 was increased and that of F was decreased in the coatings by mixing additives into the electrolyte.The formed zirconia coating could effectively improve the corrosion resistance of the AZ31 magnesium alloy.
[1]王德云,东青,陈传忠,等.微弧氧化技术的研究进展[J].硅酸盐学报,2005,33(9):1133-1138.WANG Deyun,DONG Qin,CHEN Chuanzhong,et al.J Chin Ceram Soc(in Chinese),2005,33(9):1133-1138.
[2]ZHANG X P,ZHAO Z P,WU F M,et al.Corrosion and wear resis-tance of AZ91D magnesium alloy with and without microarc oxidation coating in Hank’s solution[J].J Mater Sci,2007,42:8523-8528.
[3]杨培霞,郭洪飞,安茂忠,等.镁合金表面微弧氧化陶瓷膜耐蚀性能评价[J].航空材料学报,2007,27(3):33-36.YANG Peixia,GUO Hongfei,AN Maozhong,et al.J Aeronaut Mater(in Chinese),2007,27(3):33-36.
[4]CAO F H,LIN L Y,ZHANG Z,et al.Environmental friendly plasma electrolytic oxidation of AM60magnesium alloy and its corrosion re-sistance[J].Trans Nonferrous Met Soc China,2008,18:240-247.
[5]DUAN H P,YAN C W,WANG F H.Growth process of plasma elec-trolytic oxidation films formed on magnesium alloy AZ31D in silicate solution[J].Electrochim Acta,2007,52:5002-5009.
[6]LIANG J,WANG P,HU L T,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.
[7]VERDIER S,BOINET M,MAXIMOVITCH S,et al.Formation,structure and composition of anodic films on AM60magnesium alloy obtained by DC plasma anodizing[J].Corros Sci,2005,47:1429-1444.
[8]PARFENOV E V,YEROKHIN A L,MATTHEWS A.Impedance spectroscopy characterization of PEO process and coatings on alumin-ium[J].Thin Solid Films,2007,516:428-432.
[9]BARCHICHE C E,TOCCA E,JUERS C,et al.Corrosion resistance of plasma-anodized AZ91D magnesium alloy by electrochemical methods[J].Electrochim Acta,2007,53:417-425.
[10]LIANG J,HU L T,HAO J C.Improvement of corrosion properties of microarc oxidation coating on magnesium alloy by optimizing current density parameters[J].Appl Surf Sci,2007,253:6939-6945.
[11]LIANG J,GUO B G,TIAN J,et al.Effects of NaAlO2on structure and corrosion resistance of microarc oxidation coatings formed on AM60B magnesium alloy in phosphate-KOH electrolyte[J].Surf Coat Technol,2005,199:121-126.
[12]韩德刚,高执棣,高盘良.无机化学[M].北京:高等教育出版社,2001:654页.HAN Degang,GAO Zhidi,GAO Panliang.Inorganic Chemistry(in Chinese).Beijing:Higher Education Press,2001:p654.
基本信息:
DOI：
中图分类号:TQ174.1
引用信息:
[1]王丽,陈砺,严宗诚,等.改进的等离子体电解工艺制备氧化锆陶瓷薄膜及其性能[J].硅酸盐学报,2009,37(05):783-787.
基金信息:
广东省科技计划项目(2005B50101001)