镁合金薄壁压铸件表面亮斑形成原因
Analysis of the Formation of Light Spots on the Surface of Die-cast Magnesium Alloy Components
摘 要
镁合金压铸件在经过化学转化处理后,表面经常会有亮斑出现.分析认为造成亮斑的主要原因是压铸件在压铸过程中由于模具表面存在热点使镁液冷却速度变慢,而在压铸件表面形成了异常长大的先析出α相.由于先析出α相和共晶组织(α+β)的耐蚀性不同,因此在形成化学转化膜过程中,形成了成分不同的化学转化膜,使表面呈现出亮斑.
压铸件
亮斑
化学转化膜
magnesium alloy
die-cast component
light sopt
chemical conversion coating
Abstract
After chemical conversion treatment of magnesium die-cast components,light spots often appear on their surfaces.The reason for such a problem was analyzed.It shows hot spots formed on the die surface during casting process decrease the solidification velocity of molten magnesium and big primary α phase is formed on the surface of casting.The different corrosion resistance of primary α phase and eutectic microstructure(α+β) makes the composion of chemical conversion coating different, so that the surface with primary α phase is discolored and light spots appear.
中图分类号 TG146
所属栏目
基金项目 国家自然科学基金资助项目(50471070),山西省青年学科带头人基金资助项目;山西省自然科学基金资助项目(20041023,20051050)
收稿日期 2006/1/17
修改稿日期 2006/4/1
网络出版日期
作者单位点击查看
备注焦少阳(1981-),男,山西芮城人,硕士研究生.
引用该论文: JIAO Shao-yang,WEI Ying-hui,HOU Li-feng,GUO Yao-wen,YU Bin,XU Bing-she. Analysis of the Formation of Light Spots on the Surface of Die-cast Magnesium Alloy Components[J]. Materials for mechancial engineering, 2007, 31(1): 67～69
焦少阳,卫英慧,侯利锋,郭耀文,于斌,许并社. 镁合金薄壁压铸件表面亮斑形成原因[J]. 机械工程材料, 2007, 31(1): 67～69
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参考文献
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【2】齐丕骧.挤压铸造[M].北京:国防工业出版社,1984.
【3】袁华.提高压力铸造产品合格率的途径[J].重庆工商大学学报,2004,21(1):72-74.
【4】Sequeira W P,Murry M T,Dunlop G L,et al.Effect of section thickness and gate velocity on the microstructure and mechanical properties of high pressure die cast magnesium alloy AZ91D[C]//TMS on Automotive Alloys.Orlando:FA,1997.
【5】Ambat Rajan,Aung Naing,Zhou W.Evaluation of microstructure effect on corrosion behavior of AZ91D magnesium alloy[J].Corrosion Science,2000,42(8):1433-1455.
【6】Song Guangling,Atrens Andrew,Dargusch Matthew.Influence of microstructure on the corrosion of diecast AZ91D[J].Corrosion Science,1999,41(2):249-273.
【7】Cˇ强激光与粒子束erri E,Cˇ强激光与粒子束abibbo M,vangelista E.Microstructure evolution during high-temperature exposure in a thixo-cast magnesium alloy[J].Materials Science and Engineering,2002,A333(1-2):208-217.
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