摘要
为了研究纯稀土对镁合金腐蚀性能的影响,用高能微弧火花合金化(电火花)设备在ZM5镁合金上进行了La合金化.使用金相、电子探针和X射线衍射仪等设备对获得的涂层进行了显微结构和成分分析.并利用电化学测试仪器进行了极化曲线的测试.研究表明,可获得无气孔、裂纹的冶金结合的界面和合金化层,成分分布存在一个渐变的过程.合金化层主要由稀土镧、AlLa2与Mg17Al12相组成;合金化层的腐蚀电位正移了大约59 mV,而合金化层在3.5%NaCl溶液中的耐腐蚀性能几乎没有改善.
In order to study the effect of pure Rare Earth on the corrosion of Mg alloy, La rare earth （RE） element surface alloying on ZM5 magnesium alloy by high-energy micro-arc was performed. Optical microscope, electron probe microanalysis （EPMA） and X-ray diffraction（XRD） were used to study the microstructure and element distribution of the alloying layers. And a corrosion measurement system was applied to study the corrosion properties of potentiodynamic anode polarization. The results showed that those alloying layer of pores-free and cracking-free metallurgical bonding to the substrate were obtained. The alloying layer consisted of La, AlLa2and Mg17 All2. The corrosion potential was elevated about 59 mV, but the corrosion resistance in 3.5Wt% NaCl solution was not enhanced as well.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2007年第6期823-826,共4页
Materials Science and Technology
基金
国家自然科学基金资助项目(50371093)
沈阳黎明航空发动机集团公司资助项目(99-06-42)
关键词
镁合金
镧
电火花合金化
腐蚀
magnesium alloy
La
electro spark alloying
corrosion
