Abstract
? 2022 Elsevier B.V.Nickel-phosphorus amorphous plating can not only enhance the wearability and corrosion resistance of the substrate but also improve the optical performance. The preparation technology, structure and properties of thick nickel-phosphorus amorphous plating on SiCp/Al composite were studied in the work by using SEM, EDS, XRD, HRTEM, XPS, FT-IR, DSC, TMA and princeton electrochemical workstation. It is found that the Ni-P amorphous plating with thickness of 178 μm can be obtained by double zincate pretreatment method. The amorphous coating surface presents a typical cauliflower-like nodular structure, and the weight percentage concentration of P in the coating surface is about 12.36 wt%, which belong to the high phosphorus coating. The initial crystallize temperature of the Ni-P coating is about 322.5 ℃ at the heating rate of 5 ℃·min?1, the Vickers microhardness is about 554–570HV and has excellent corrosion resistance compared with the substrate. The average thermal expansion coefficient of the coating is about 14.8–15.4 × 10?6 m·℃?1, which follows a linear law at the crystallization temperature, and has a little difference at the same temperature in different directions. Apart from that, factors to affect the adhesion and thickness of the Ni-P amorphous plating were also analyzed.
NSTL
Elsevier