Effects of Low-Concentration Copper Sulfate on the Microstructure and Properties of Electroless Ni-P Coatings

ZHOU Baiyu, HUANG Renchao

doi:10.16577/j.issn.1001-1560.2024.0138

Materials Protection >

2024 , Vol. 57 >Issue 6: 147 - 153

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0138

Effects of Low-Concentration Copper Sulfate on the Microstructure and Properties of Electroless Ni-P Coatings

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(Modern Equipment Manufacturing Institute, Chenzhou Vocational Technical College, Chenzhou 423000, China)

ZHOU Baiyu (1987-), Master, Instructor, Research Focus: Preparation and Properties of Metallic Materials, Tel.: 15526282060, E-mail: 313700212@qq.com

Received date: 2023-09-26

Revised date: 2023-11-15

Accepted date: 2023-11-25

Online published: 2024-06-25

Supported by

Scientific Research Foundation of Education Bureau of Hunan Province (No.22B0946)

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Abstract

In order to improve the surface quality and properties of nickel-phosphorus(Ni-P) coatings, a small quantity of copper sulfate(CuSO₄·5H₂O) was added to the electroless Ni-P plating solution to prepare Ni-P coatings. The surface morphology, composition and structure of the coatings were analyzed using scanning electron microscopy, energy-dispersive spectroscopy and X-ray diffractometer. The effects of CuSO₄·5H₂O concentration on the microstructure, surface roughness, glossiness, hardness, wear resistance and corrosion resistance of the coatings were investigated. Results showed that when the concentration of CuSO₄·5H₂O was 0.1 g/L, the coating exhibited a dense, amorphous nodular structure with the best corrosion resistance. At a concentration of 0.2 g/L, the coating had the best surface quality, high hardness and excellent wear resistance, but a small amount of microcrystalline Ni-Cu solid solution appeared in the coating, leading to decreased corrosion resistance. When the concentration of CuSO₄·5H₂O exceeded 0.2 g/L, the coating formed a mixed crystalline cauliflower-like structure, and both the surface quality and corrosion resistance of the coating deteriorated with increasing CuSO₄·5H₂O concentration.

Key words： electroless plating; Ni-P coating; copper sulfate concentration; microscopic structure; wear resistance; corrosion resistance

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ZHOU Baiyu, HUANG Renchao . Effects of Low-Concentration Copper Sulfate on the Microstructure and Properties of Electroless Ni-P Coatings[J]. Materials Protection, 2024 , 57(6) : 147 -153 . DOI: 10.16577/j.issn.1001-1560.2024.0138

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