MgNiSi非晶的制备及其热稳定性和腐蚀性能研究

Synthesis,Thermal Stability and Corrosion Behavior of MgNiSi Based Amorphous Alloy

通过机械球磨的方法成功制得Mg55Ni35Si10非晶粉末,并采用X射线衍射(XRD)对其非晶形成过程进行研究,发现Mg55Ni35Si10粉末样品在球料比为20∶1、转速为600r/min的条件下,经过54h球磨后开始形成完全的非晶结构。还采用差示扫描量热仪(DSC)对Mg55Ni35Si10非晶粉末的热稳定性进行了研究,通过Kissinger方程得到样品开始晶化的表观激活能为(280.6±44.5)kJ/mol,与文献中报道的Mg65Cu25Gd10的激活能((285.2±27.6)kJ/mol)相近,说明样品具有较好的热稳定性。此外,还对Mg55Ni35Si10非晶在NaCl溶液中的腐蚀行为进行了研究,发现该样品的腐蚀电位远远正于AZ31和AZ61镁合金,表明Mg55Ni35Si10非晶具有较好的耐腐蚀性能。

In this paper,Mg55Ni35S10 amorphous alloy powders are prepared by the mechanical alloying. When the milling velocity is 600r/min, the mass ratio of ball to powder is 20 ： 1 and the forming time of the amorphous is about 54h, the amorphous phase generated in the course of the mechanical alloying is investigated by X-ray diffraction （XRD）. The thermal stability of these Mg55Ni35S10 amorphous alloy powders is investigated using the differential scanning calorimeter（DSC）. The apparent activation energy of the initial crystallization effect of amorphous alloy powders calculated by the Kissinger method is （280. 6±44. 5）kJ/mol, which is the same as the activation energy of Mg55Ni35S10 （（285.2±27.6）kJ/mol） reported in papers. The high thermal stability is revealed for this amorphous alloy powders. In addition, the corrosion behavior of the Mgss Nias Si10 amorphous alloy powders in 0. 05mol/L NaCl solution investigated by electrochemical measurements. The corrosion potential of Mg65Ni25S10 amorphous alloy powders is more positive than that of AZ31 and AZ61 alloy, and show higher corrosion resistance.