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Citation: Fang Jingli, Ye Xiangrong, Fang Jing. COMPOSITION AND STRUCTURE OF THE LOW PHOSPHOROUS ELECTROLESS NICKEL COATING[J]. Chinese Journal of Applied Chemistry, ;1992, 9(5): 34-38. shu

COMPOSITION AND STRUCTURE OF THE LOW PHOSPHOROUS ELECTROLESS NICKEL COATING

1.
Institute of Applied Chemistry, Nanjing University, Nanjing 210008

Corresponding author: Fang Jingli,
Received Date: 25 June 1991
Available Online: 15 April 1992

The morphology, crystalline state, composition elements and their depth, profile and valence state were studied by scannfing electron microscopy (SEMi), x-ray diffractometry (XRD) and electron spectrometry (XPS and AES). The result showed that the low phosphorous electroless nickel coating has a smooth lamellar structure, composed of Ni and Ni₂P of low crystalline state, but they were transformed into Ni and Ni₃P of complete crystalline state after heat treatment at 350℃ for 1h.The phosphorous and nickel in low phosphorous eleetroless nickel coating were in zero valance state, with binding energy being 129.1 eV and 852.3 eV respectively. The compositions(A.C.%) of the Ni-P coating were Ni 85.4%, P 10.1%, O 4.5% as obtained after the constant composition region of the AES depth profile curves of the Ni-P coating.
- electroless nickel plating,
- Ni-P alloy,
- XPS,
- AES,
- XRD
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