采用盐雾腐蚀和动电位扫描研究了稀土元素Ce、Nd对AZ31镁合金耐腐蚀性能的影响.采用数码相机、金相显微镜和扫描电镜观察及定量金相分析系统测量分析了样品的腐蚀程度,并采用恒电位仪测量了动电位扫描极化曲线.结果表明,盐雾腐蚀试验中,合金试样腐蚀面积百分数随时间延长呈直线上升,添加稀土Ce和Nd后腐蚀速率降低50%以上.在电化学试验中.添加稀土后合金腐蚀电流密度降低了1/3～1/2.稀土可以起到提高α(Mg)固溶体耐蚀性能的作用,还可以形成含稀土的第二相并使AZ31合金中的β(Mg17Al12)相均匀分布,发挥其阻碍腐蚀的作用,从而最终提高AZ31镁合金的耐蚀性能.
参考文献
| [1] | 曾爱平,薛颖,钱宇峰,王志杰,黄元伟,陈英.镁合金表面改性新技术[J].材料导报,2000(03):19-20,15. |
| [2] | Sachiko O;Katsuhiko A .Mechanism of chemical conversion coating film growth on magnesium and magnesium alloy[J].Materials Transactions-Japan Institute of Metals,2001,42(07):1225-1231. |
| [3] | Song G L;Atrens A;Wu X L .Corrosion behavior of AZ21,AZ501 and AZ91 in sodium chloride[J].Corrosion Science,1998,40(10):1769-1778. |
| [4] | Shinji Fukumoto;Atsushi Yamamoto;Mititaka Terasawa .Microstructures and Corrosion Resistance of Magnesium Implanted with Nitrogen Ions[J].Materials transactions,2001(7):1232-1236. |
| [5] | Atsushi Yamamoto;Atsushi Watanabe;Kana Sugahara .In Situ Laser Microscopy on Corrosion in Deposition Coated Magnesium Alloy[J].Materials transactions,2001(7):1243-1248. |
| [6] | Ghali E.; .Corrosion and Protection of Magnesium Alloys[J].Materials Science Forum,2000(0):261-272. |
| [7] | Cahn R W;师昌绪;柯俊.非铁合金的结构与性能[M].北京:科学出版社,1999:105-190. |
| [8] | Asm International.Magnesium and Magnesium Alloy[M].OH:Metal Park,1999:1-47. |
| [9] | Bonora P L;Andrei M;Eliezer A .Corrosion behavior of stressed magnesium alloy[J].Corrosion Science,2002,44:729-735. |
| [10] | Song G;Atrens A .Influence of microstructure on the corrosion of diecast AZ91D[J].Corrosion Science,1999,41:249-260. |
| [11] | Umehara H.;Terauchi S. .Structure and Corrosion Behavior of Conversion Coatings on Magnesium Alloys[J].Materials Science Forum,2000(0):273-282. |
| [12] | Bonora P L;Andrei M;Eliezer A .Corrosion behavior of stressed magnesium alloys[J].Corrosion Science,2002,44:729-749. |
| [13] | Mcintyue N S;Chen C .Role of impurities on Mg surfaces under ambient exposure conditions[J].Corrosion Science,1998,40:1697-1709. |
| [14] | Gutman E M;Unigovski Y;Eliezer A.Mechanoelectrochemical Behavior of Pure Magnesium and Magnesium Alloys Stressed in Aqueous Solutions[J].J of Mater Synthesis and Processing,2000(08):3-4. |
| [15] | Shigematsu I.;Saitou N.;Shimojima K.;Nakamura M. .Surface treatment of AZ91D magnesium alloy by aluminum diffusion coating[J].Journal of Materials Science Letters,2000(6):473-475. |
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