Influences of Pulse Current Density on the Characteristics of Ni-W-P-CeO2-SiO2 Composite Coatings
Square-wave double pulse current was used to electrodeposit Ni-W-P-CeO2-SiO2 composite coatings in fine-grained structure on the surface of carbon steel, influences of forward pulse average current density, +Jm, in the range of 5~25A/dm2 on characteristics of the composite coatings were researched, and the chemical compositionSubscript texts, deposition rate, microhardness and microstructures were evaluated by EDX, SEM and Microhardness tester. The results show that the uniform composite coatings can be obtained at +Jm of 20A/dm2, which possess higher microhardness of 735Hv. The grains sizes of the composite coatings decrease when +Jm is increased from 5A/dm2 to 20A/dm2, while the reappearance of large grains structure at 25A/dm2.
Xianghua Liu, Zhengyi Jiang and Jingtao Han
R. D. Xu et al., "Influences of Pulse Current Density on the Characteristics of Ni-W-P-CeO2-SiO2 Composite Coatings", Advanced Materials Research, Vols. 418-420, pp. 856-860, 2012