Investigation of Microstructure and Mechanical Properties of Ni-Cu-P Coatings Deposited by the Electroless Method

Subject Areas : Coatings

Danial Davoodi ¹ , Amir Hossein Emami ² , Sayed Mahmoud Monir Vaghefi ³ , Mahdi Omidi ⁴ , Hamid Reza Bakhsheshi-Rad ⁵

1 - Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
2 - Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
3 - Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
4 - Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
5 - Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.

Received: 2022-02-21 Accepted : 2022-03-30 Published : 2022-04-01

Keywords: TEM, Heat treatment, Microhardness, Electroless Ni-Cu-P, L80 steel,

Abstract :

In the current study, the effect of colloidal copper nanoparticles on the deposition rate and hardness of Ni-Cu-P coating deposited by electroless method on L80 steel substrate was investigated. Copper particle size, microstructure, chemical composition, and hardness of the coating before and after heat treatment at different temperatures were examined by transmission electron microscopy (TEM), X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy dispersive X-ray (EDS) analysis, and microhardness. The microstructure study by XRD showed that the Ni-Cu-P coating has an amorphous structure. The heat treatment at 400 °C transformed the structure from amorphous to crystalline and formed Niα, Ni3P, and Ni3.8Cu phases. The amount of copper nanoparticles in the coating 4.58 wt% was measured. The deposition rate of the Ni-Cu-P coating was 11 µm/h. Furthermore, the hardness of the coating increased from 738HV to 1300HV by performing heat treatment.

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