分别在超临界条件和普通条件下制备了镍基石墨烯复合电铸层，研究了两种制备条件和氧化石墨烯（GO）质量浓度对复合电铸层显微组织、表面形貌、硬度和耐磨性能的影响。结果表明：与普通条件下的相比，超临界条件下复合电铸层的显微组织致密，表面粗糙度低，镍（111）和（220）晶面择优度降低而（220）晶面择优度增大，硬度和耐磨性提高；在超临界条件下，随着GO质量浓度的增加，复合电铸层的显微硬度、耐磨性及石墨烯纳米薄片嵌入量均呈现出先升后降的变化趋势，当GO质量浓度为0.20 g·L^-1时，复合电铸层中的石墨烯含量最多，显微硬度最大，为768 HV，耐磨性最好。

A nickel-based graphene composite electroforming layer was prepared under supercritical and ordinary conditions, respectively. The effects of two preparation conditions and graphene oxide (GO) mass concentration on the microstructure, surface morphology, hardness and wear resistance of the composite electroforming layer were investigated. The results show that comparing to those under the ordinary condition, the microstructure of the composite electroforming layer under the supercritical condition was compact and the surface roughness was lower; the preferred degree of the Ni crystal face (111) and (220) decreased while that of the crystal face (220) increased; the hardness and wear resistance were improved. Under the supercritical condition, with the increase of the GO mass concentration, the microhardness, wear resistance and the embedding amount of graphene nanosheets all first increased then decreased. When the GO mass concentration was 0.20 g·L^-1, the graphene content in the composite electroforming layer was the highest, and the microhardness reached the largest value of 768 HV, also the relative wear resistance was the best.