在含有EDTA-Ca和Na2HPO4的电解液中，以恒电流方式制备富含Ca和P的镁合金微弧氧化陶瓷膜，研究电流密度对陶瓷膜结构及耐蚀性的影响。利用涂层测厚仪、X-射线荧光光谱仪（XRF）、X-射线衍射仪（XRD）、扫描电子显微镜（SEM）及电化学工作站对陶瓷膜厚度、元素组成、相组成、表面形貌及膜层在Hank溶液中的耐蚀性进行了测试。结果表明：随着电流密度的增加，膜层的厚度及 Ca/P 均呈现先增加后减小的趋势；膜层主要由 MgO 及 MgAl2O4组成，膜层中的Ca，P以非晶形式存在；陶瓷膜均呈现典型的微弧氧化形貌，随着电流密度的增加，孔径逐渐增大，分布逐渐趋于不均匀，甚至出现裂痕；电流密度为100 mA/cm2，MgAl2O4含量最高，膜层的耐蚀性最佳。
The ceramic films containing Ca and P were prepared in an electrolyte containing EDTA?Ca and Na2HPO4 by micro?arc oxidation with constant current mode. The effects of current density on the microstructure and corrosion resistance of the oxide films were investigated. The thickness,element composition,phase composition,surface morphology and corrosion resistance of the oxide films in Hank’s solution were analyzed by coating thickness gauge,X?ray fluorescence(XRF),X?Ray diffraction (XRD),scanning electron microscopy(SEM)and electrochemical workstation. The results show that with current density increasing,the thickness and Ca/P of the oxide films increase first and then decrease. The oxide films are mainly composed of MgO and MgAl2O4,and Ca and P inside the oxide layer exist with amorphous phase. As the current density increases,the films exhibit typically crater?like structure,and the pore diameter increases with uneven distribution until crack occurs. When the current density is 100 mA/cm2,the content of MgAl2O4 in the oxide film reaches the highest,and corrosion resistance of the films is optimum.
参考文献
| [1] | Shadanbaz,S.;Dias,G.J. .Calcium phosphate coatings on magnesium alloys for biomedical applications: A review[J].Acta biomaterialia,2012(1):20-30. |
| [2] | C. N. Elias;J. H. C. Lima;R. Valiev;M. A. Meyers .Biomedical Applications of Titanium and its Alloys[J].JOM,2008(3):46-49. |
| [3] | Staiger MP;Pietak AM;Huadmai J;Dias G .Magnesium and its alloys as orthopedic biomaterials: A review[J].Biomaterials,2006(9):1728-1734. |
| [4] | 宋光铃,宋诗哲.镁在人体模拟液中的腐蚀行为[J].物理化学学报,2006(10):1222-1226. |
| [5] | 中国科学院金属研究所 .一种使镁及其合金构件防蚀、耐磨的方法[P].中国,03111567.5,2004-11-03. |
| [6] | 吴国松,曾小勤,郭兴伍,姚寿山.气相沉积膜层在镁合金表面改性中的应用[J].材料工程,2006(01):61-65. |
| [7] | Fracassi F;Agostino R D;Palumbo F et al.Application of plas-ma deposited organic silicon thin films for the corrosion protec- tion of metals[J].Surface and Coatings Technology,2003,174/175:107-111. |
| [8] | Liu CL;Xin YC;Tian XB;Chu PK .Corrosion behavior of AZ91 magnesium alloy treated by plasma immersion ion implantation and deposition in artificial physiological fluids[J].Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films,2007(2/4):422-427. |
| [9] | 张建斌,季根顺,樊丁,刘红涛.添加Si粉对AZ91D镁合金激光表面改性[J].材料热处理学报,2010(09):107-110. |
| [10] | Huang, C.A.;Lin, C.K.;Yeh, Y.H. .Increasing the wear and corrosion resistance of magnesium alloy (AZ91D) with electrodeposition from eco-friendly copper- and trivalent chromium-plating baths[J].Surface & Coatings Technology,2010(1):139-145. |
| [11] | Arrabal, R;Pardo, A;Merino, MC;Mohedano, M;Casajus, P;Merino, S .Al/SiC thermal spray coatings for corrosion protection of Mg-Al alloys in humid and saline environments[J].Surface & Coatings Technology,2010(16/17):2767-2774. |
| [12] | Zhang X L;Yao Z P;Jiang Z H et al.Investigation of the plas- ma electrolytic oxidation of Ti6Al4V under single-pulse pow-er supply[J].Corrosion Science,2011,53(06):2253-2262. |
| [13] | 刘福 .医用Ti及Ti-6Al-4V合金微弧氧化和水热处理表面改性[D].哈尔滨工业大学,2005. |
| [14] | Adjustment of the ratio of Ca/P in the ceramic coating on Mg alloy by plasma electrolytic oxidation[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2009(13/14):6724. |
| [15] | 常立民,徐丹丹,刘伟.不同磷源制备的镁合金微弧氧化生物陶瓷膜的性能比较[J].材料保护,2011(11):21-24. |
| [16] | Yao ZP;Jiang ZH;Sun XT;Xin SG;Li YP .Influences of current density on structure and corrosion resistance of ceramic coatings on Ti-6Al-4V alloy by micro-plasma oxidation[J].Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films,2004(1/2):120-124. |
| [17] | Hongfei Guo;Maozhong An;Shen Xu;Huibin Huo .Formation of oxygen bubbles and its influence on current efficiency in micro-arc oxidation process of AZ91D magnesium alloy[J].Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films,2005(1/2):53-58. |
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