利用同步辐射X射线实时成像技术,原位研究了处理液组分H3PO4,KMnO4 及MnCO3 对镁合金/处理液界面无铬化学转化膜形成过程的影响,并结合扫描电镜分析了所生成转化膜的表面形貌。研究结果表明:高能同步辐射X射线可以透过镁合金/处理液界面,利用原位成像技术能够实时观察转化膜的生长过程;KMnO4 能够显著促进AZ31镁合金转化膜的形成,所得到的转化膜表面较平整,裂纹较少,而MnCO3 对转化膜形成的促进作用有限。

The influences of H3PO4, KMnO4 and MnCO3 on the formation process of chromium-free chemical conversion coating at magnesium alloy/conversion treatment solution interface by using synchrotron radiation were in situ studied. Furthermore, we analyzed the surface morphology of magnesium alloys through the sweep electron microscopy. The result shows that the high-energy synchrotron radiation X-ray can penetrate through the magnesium alloy/conversion treatment solution interface, the formation process of conversion coating can be observed in real time using in situ imaging technology. The potassium permanganate can improved the formation of conversion coating significantly, and the surface of the coating is smooth with less cracks. However, manganous carbonate can limitely improve the formation of the coating.