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采用喷射沉积Al-Ti-C预制体和ZA35合金的混熔体制备原位反应TiC_P/ZA35复合材料,对TiC_P/ZA35复合材料进行固溶时效处理。利用金相显微镜、X射线衍射(XRD)和电化学工作站研究了固溶与时效处理后复合材料的组织和电化学性能。结果表明,TiC_P/ZA35复合材料组织为细小等轴晶,Ti C颗粒分布均匀。经过350℃×4 h固溶+150℃×6 h时效处理后,析出相主要是MnAl_6和Al_(11)Cu_5Mn_3。在3.5%NaCl溶液中,经过350℃×4 h固溶+150℃×6 h时效处理的复合材料腐蚀电流密度最小,为0.005 m A/cm~2,相对于未处理复合材料减小73.7%。适宜热处理相对于未处理复合材料的电阻增加和电极双电层电容下降是改善耐蚀性的主要原因。在本实验中,TiC_P/ZA35复合材料最佳的热处理工艺是350℃×4 h固溶+150℃×6 h时效。
In-situ TiC_P / ZA35 composites were prepared by spray deposition of a mixed melt of Al-Ti-C preform and ZA35 alloy, and the TiC_P / ZA35 composites were solution treated with aging treatment. The microstructures and electrochemical properties of the composites after solution treatment and aging treatment were investigated by metallographic microscope, X-ray diffraction (XRD) and electrochemical workstation. The results show that the microstructure of TiC_P / ZA35 composites is fine equiaxed and TiC particles are evenly distributed. After 350 ℃ × 4 h solution + 150 ℃ × 6 h aging treatment, the precipitated phases are mainly MnAl_6 and Al_ (11) Cu_5Mn_3. In 3.5% NaCl solution, the corrosion current density of the composites after aging at 350 ℃ for 4 h and aging at 150 ℃ for 6 h is the smallest, which is 0.005 m A / cm ~ 2, which decreases by 73.7% compared with untreated composites. . The increase of electrical resistance and the decrease of electric double layer capacitance of electrode are the main reason to improve the corrosion resistance. In this experiment, TiC_P / ZA35 composites the best heat treatment process is 350 ℃ × 4 h solution + 150 ℃ × 6 h aging.