镁合金压铸件化成后表面白斑形成机理
The Forming Mechanism of the White Spot on the Chemical Conversion Coating of the Die-Casting Magnesium Alloy
DOI: 10.12677/MS.2013.32019, PDF, HTML, XML,   
作者: 韩民杰*：中北大学材料科学与工程学院；刘宝胜*：太原理工大学材料科学与工程学院
关键词: 镁合金；耐蚀性；化成；白斑；Magnesium Alloy; Corrosion Resistance; Chemical Conversion; White Spot
摘要: 本文研究了镁合金压铸件化成处理后表面白斑形成机理，对其形态和组织进行了 SEM 及金相显微观察，并对其表面进行了粗糙度分析试验。结果表明：异型大块 α 相是白斑形成的主要原因，而白斑出现的本质是在压铸过程中，由于模具表面温度不一致，使得铸件表面形成粗大的先析 α 相 ， 改变喷涂离型剂方法可消除此种不良现象。
Abstract: The forming mechanism of the white spot of the die-casting magnesium was investigated by means of SEM andOM.The roughness of the white spot was also tested. It indicated that the larger α phase caused by the uneven temperature distribution of the die result in the formation of the white spot. It can be improved by changing the agent spaying parameter.
文章引用：韩民杰, 刘宝胜. 镁合金压铸件化成后表面白斑形成机理[J]. 材料科学, 2013, 3(2): 99-102. http://dx.doi.org/10.12677/MS.2013.32019

参考文献

[1] Y. Kojima. Plat form science and technology for advanced magnesium alloys. Materials Science Forum, 2000, 350-351: 3- 18.
[2] R. M. Wang. Microstructures and dislocations in the stressed AZ91D magnesium alloys. Materials Science and Engineering: A, 2002, 344(1): 279-287.
[3] M. Zhao, S. S. Wu. A chromium-free conversion coating of magnesium alloy by a phosphate-permanganate solution. Surface and Coatings Technology, 2006, 200(18-19): 5407-5412.
[4] C. S. Lin, H. C. Lin. Formation and properties of stannate con- version coatings on AZ61 magnesium alloys. Corrosion Science, 2006, 48(1): 93-109.
[5] A. L. Rudd, C. B. Breslin and F. Mansfeld. The corrosion protection afforded by rare earth conversion coatings applied to magnesium. Corrosion Science, 2000, 42(2): 275-288.
[6] M. A. Gonzalez-Nunez, C. A. Nunez-Lopez, P. Skeldon, et al. A non-chromate conversion coating for magnesium alloys and magnesium-based metal matrix composites. Corrosion Science, 1995, 37(11): 1763-1772.
[7] J. E. Gray, B. Luan. Protective coatings on magnesium and its alloys-a critical review. Journal of Alloys and Compounds, 2002, 336(1-2): 88-113.
[8] 王业双, 张咏波, 王渠东等. Mg-9Al合金铸造凝固模型[J]. 金属学报, 2002, 5: 539-543.
[9] G. L. Song, A. Atrens and M. Dargusch. Influence of micro- structure on the corrosion of diecast AZ91D. Corrosion Science, 1999, 41(2): 249-273.

为你推荐
Baidu
map