In this study, 85-xWC-xTiC-15wt%Al₂O₃ (x = 0, 5, 10 and 20 wt%) composites were fabricated via hot pressing sintering technology. The influences of TiC additives on the mechanical performance and electrochemical behavior of WC-Al₂O₃ composite in NaCl solution were investigated. The mean size of WC grain showed a downward trend with the increase of TiC content. The relative density, hardness and fracture toughness of WC-based composites were improved by TiC additives. The maximum values of mechanical performance were obtained when TiC content was 10 wt%. Moreover, the research results indicated that TiC additives significantly increase the corrosion potential and decrease the corrosion current density in NaCl solution. When TiC content increased, the charge-change resistance (R_ct) value presented an uptrend, and then decreased obviously when the TiC content reached 20 wt%. The XPS spectrum and SEM images proved that TiO₂ passivation film was formed on the surface of WA15-10TiC composite. Therefore, it could be concluded that TiO₂ passive film could inhibit further corrosion of the composite.

在这项研究中，通过热压烧结技术制备了85-xWC-xTiC-15wt％Al ₂ O ₃（x = 0、5、10和20 wt％）复合材料。TiC添加剂对WC-Al ₂ O ₃的力学性能和电化学行为的影响研究了NaCl溶液中的复合材料。随着TiC含量的增加，WC晶粒的平均尺寸呈下降趋势。TiC添加剂可改善WC基复合材料的相对密度，硬度和断裂韧性。当TiC含量为10重量％时，获得了机械性能的最大值。此外，研究结果表明，TiC添加剂可显着提高NaCl溶液中的腐蚀电位并降低腐蚀电流密度。当TiC含量增加时，耐电荷变化性（R _ct）值呈上升趋势，而当TiC含量达到20 wt％时，则明显下降。XPS光谱和SEM图像证明了TiO ₂在WA15-10TiC复合材料的表面上形成钝化膜。因此，可以得出结论，TiO ₂钝化膜可以抑制复合材料的进一步腐蚀。