Ni matrix nanocomposite coatings with a microstructure tailored by Cr and graphene particles were assembled at various current densities by electroplating. The tailoring effect of particles on the surface morphology, composition, microstructure, and properties of the nanocomposite coating was comprehensively explored. The results revealed that the contents of Cr and graphene particles in the nanocomposite coating were elevated by decreasing the current density, resulting in an increased amount of small dendrite-like surface structures. The embedded particles blocked the formation of [200] fiber texture and concurrently brought about crystallite refinement of the Ni deposits. A COMSOL simulation and BSE images revealed that the embedded particles tailored the microstructure of Ni deposits by heterogeneous nucleation, rearrangement, and local current density concentration. The current density concentration on the particles contributed to the selective growth of Ni deposits on the particles. The synergistic effect of the tailored microstructure and embedded particles substantially enhanced the corrosion resistance of the Ni–Cr–graphene nanocomposite coating. In 3.5 wt% NaCl media, the I_corr of the nanocomposite coating electroplated at 1 A/dm² (0.1 μA/cm²) was an order of magnitude lower than that at 20 A/dm² (2.63 μA/cm²) owing to the strengthened synergistic effect.

通过电镀以不同的电流密度组装具有由Cr和石墨烯颗粒定制的微结构的Ni基纳米复合涂层。全面探讨了颗粒对纳米复合涂层表面形貌，组成，微观结构和性能的定制作用。结果表明，通过降低电流密度，可以提高纳米复合涂层中Cr和石墨烯颗粒的含量，从而增加了小的类树突状表面结构的数量。包埋的颗粒阻止了[200]纤维织构的形成，并同时导致Ni沉积物的微晶细化。COMSOL仿真和BSE图像显示，嵌入的粒子通过异质形核，重排，和局部电流密度浓度。颗粒上的电流密度浓度有助于颗粒上的镍沉积物的选择性生长。量身定制的微观结构和嵌入颗粒的协同效应大大增强了Ni-Cr-石墨烯纳米复合涂层的耐蚀性。在3.5 wt％NaCl介质中，我_科尔所述纳米复合材料中的1克安培/分米电镀涂层²（0.1μA/厘米²）是一个数量级比在20安培/分米降低²（2.63μA/厘米²）由于加强协同效应。