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为改善AZ91镁合金的耐蚀性能,对AZ91镁合金表面进行不同种类离子注入(N、Cr、N+Cr)。通过X射线衍射仪(XRD)、扫描电镜(SEM)、电化学腐蚀系统和显微硬度仪分析了离子注入前后表面结构、耐蚀性能和显微硬度的变化。结果表明:基体由Mg和Al12Mg17相组成,注入后的试样形成了注入元素与基体元素间的金属间化合物和以固溶形式存在的注入元素。扫描电镜清晰地观察到双离子注入后试样的晶界和不同的相组织结构,说明离子注入对基体产生了明显的溅射作用。注入后自腐蚀电位和显微硬度都得到一定程度的提高,N离子注入试样的显微硬度提高达38.8%。
In order to improve the corrosion resistance of AZ91 magnesium alloy, different kinds of ion implantation (N, Cr, N + Cr) were carried out on the surface of AZ91 magnesium alloy. The changes of surface structure, corrosion resistance and microhardness before and after ion implantation were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), electrochemical corrosion system and microhardness tester. The results show that the matrix consists of Mg and Al12Mg17 phases. The implanted samples formed the intermetallics between the implanted elements and matrix elements and the implanted elements in solid solution. Scanning electron microscopy clearly observed the grain boundary and different phase structure of the sample after double ion implantation, indicating that the ion implantation has a significant sputtering effect on the substrate. The corrosion potentials and the microhardness of the samples were improved to a certain degree after the implantation. The microhardness of the N-ion-implanted samples increased by 38.8%.