以AZ31镁合金热喷涂铝涂层为研究对象,用自制的振动热扩散装置,进行一定温度热扩散或在热扩散的同时进行振动机械研磨处理,研究比较了振动热扩散对镁合金热喷铝涂层的影响.采用金相显微镜、扫描电子显微镜观察涂层表面、截面形貌,对涂层界面进行能谱分析,利用显微硬度计测量不同工艺下涂层与镁基体界面处硬度变化,利用X射线衍射分析涂层与基体界面处扩散区域相组成,用电化学工作站测得涂层极化曲线,通过盐水浸泡分析比较了不同工艺处理后镁合金的耐腐蚀性.结果表明:镁合金喷铝涂层经360~400℃保温2h热扩散或振动热扩散(机械研磨热扩散),在涂层与镁基体的界面处镁铝原子有不同程度的互扩散,并有镁铝Al12Mg17相生成,界面硬度有极大提高,振动热扩散使涂层明显致密化并形成连续析出相,能有效提高涂层的耐腐蚀性能.
参考文献
[1] | SONG Cuang-ling .Corrosion and protection of magnesium alloys:An overview of research undertaken by CAST[J].Materials Science Forum,2005,488-489(06):649-654. |
[2] | 刘志远,邵忠财.镁合金表面处理的研究现状与展望[J].电镀与涂饰,2007(11):27-30. |
[3] | J.E. Gray;B. Luan .Protective coatings on magnesium and its alloys-a critical review[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2002(1/2):88-113. |
[4] | Shigematsu M .Surface treatment of AZ91D magnesium alloy by aluminum[J].Journal of Materials Science Letters,2000,19:473-475. |
[5] | 张津,麻彦龙,黄福祥,肖锋.镁合金表面铝涂层研究新进展[J].表面技术,2007(05):64-67. |
[6] | Zhang M X;Kelly P M .Surface alloying of AZ91D by diffusion coating[J].J Mater Rec,2002,17(10):2477-2479. |
[7] | ZHU Li-qun;SONG Guang-ling.Improved corrosion resistance of AZ91D magnesium alloy by an aluminum-alloyed coating[J].Surface and Coatings Technology,2006(200):2834-2840. |
[8] | 张津,孙智富.AZ91D镁合金表面热喷铝涂层研究[J].中国机械工程,2002(23):2057-2058. |
[9] | Jin ZHANG;Ying WANG;Rongchang ZENG;Weijiu HUANG .Effects of Post Heat Treatment on the Interfacial Characteristics of Aluminum Coated AZ91D Magnesium Alloy[J].Materials Science Forum,2007(1):529-532. |
[10] | ZHANG Jin;WANG Ying .Effect of heat treatment on microstructures and properties of zinc-aluminum coating on AZ91D magnesium alloy[J].Key Engineering Materials,2008,373-374:55-58. |
[11] | 何业东;詹肇麟;王德仁 .一种加速制备合金涂层的方法[P].中国,200410009189.7,2004-06-09. |
[12] | Zhaolin Zhan;Yedong He;Deren Wang .Low-temperature processing of Fe-Al intermetallic coatings assisted by ball milling[J].Intermetallics,2006(1):75-81. |
[13] | 张津;章宗和.镁合金及应用[M].北京:化学工业出版社,2004 |
[14] | 宋光铃.镁合金腐蚀与防护[M].北京:化学工业出版社,2006 |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%