Coating is the most common method to offer better wettability between carbon fibers (CFs) and metal matrix of the composites. An optimal electroless Ni plating process was studied in this paper to improve the interfacial adhesion of CF reinforced Al-matrix composites. By using Pd-colloid activation, the typical island-like agglomeration on the coating surface was significantly eliminated, providing a R_q reduction of 56.5%. Applying strong-oxidizing mixed acid (SMA) etching provided larger adhesion force (140.53 nN) and interfacial shear strength (IFSS) (35.1 MPa) than that of the original process (53.72 nN and 31.1 MPa), which can be attributed to rougher surface and larger numbers of carboxyl functional groups on CF surface. By combining these processes, the adhesion force further increased to 207.99 nN with improved IFSS to 40.9 MPa, and R_q was reduced by 72.1%. The ultimate tensile strength (UTS) of the composites increased to 140 MPa, which is 35.9% higher than that with CFs by original method.

涂层是在复合材料的碳纤维（CFs）和金属基质之间提供更好润湿性的最常用方法。本文研究了一种优化的化学镀镍工艺，以改善CF增强Al基复合材料的界面附着力。通过使用Pd-胶体活化，可以消除涂层表面上典型的岛状团聚，从而提供R _q减少56.5％。与原始工艺（53.72 nN和31.1 MPa）相比，采用强氧化混合酸（SMA）蚀刻可提供更大的附着力（140.53 nN）和界面剪切强度（IFSS）（35.1 MPa），这可归因于表面更粗糙和CF表面上的大量羧基官能团。通过结合这些过程，附着力进一步提高至207.99 nN，IFSS改善至40.9 MPa，R _q降低了72.1％。复合材料的极限拉伸强度（UTS）增加到140 MPa，比原来的CFs高35.9％。