采用摩尔比为3:1.2:2的TiH2、Si和石墨粉末反应合成高纯度多孔Ti3SiC2.通过浸泡实验研究多孔Ti3SiC2在硝酸和王水中的腐蚀行为.采用扫描电镜、X射线衍射、能谱仪和X射线光电子能谱仪分析样品腐蚀前后的形貌、成分和元素含量,确定腐蚀产物和腐蚀机制.结果表明:多孔Ti3SiC2在稀硝酸和王水中腐蚀严重,浸泡600 h质量损失分别为26.9和132.5μg/cm2,Ti3SiC2在腐蚀过程中转化为Ti5Si3.而具有相似孔隙率和孔径的多孔Ti5Si3在硝酸和王水中浸泡600 h后质量损失分别为9.34和7.06μg/cm2,表现出更好的抗腐蚀性.多孔Ti3SiC2在硝酸和王水中的腐蚀行为归因于其特殊的显微组织.
Porous Ti3SiC2 with high purity was synthesized using TiH2, Si and C powders with mole ratio of Ti to Si to C being 3:1.2:2 by reactive synthesis method. The corrosion behaviors of porous Ti3SiC2 in nitric acid and aqua regia were investigated by immersing test. Scanning electron microscope (SEM), X-ray diffractometer (XRD), energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS) were used to analyze the morphology, compositions and element contents of the samples before and after corrosion to determine the corrosion product and corrosion mechanism. The mass loss values of porous Ti3SiC2are 26.9 and 132.5 μg/cm2, respectively after immersing in nitric acid and aqua regia for 600 h. The results indicate that Ti3SiC2 transforms to Ti5Si3 which has better corrosion resistance in nitric acid and aqua regia with mass loss values of 9.34 and 7.06μg/cm2 under the same immersing time, respectively. The dramatic dissolution of porous Ti3SiC2 in the acids is due to its special microstructure.
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