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Citation: HU Guang-hui, WU Hui-huang, YANG Fang-zu. Corrosion Resistance of Electroless Ni-P Deposits and Its Relation to P Contents[J]. Acta Physico-Chimica Sinica, ;2005, 21(11): 1299-1302. doi: 10.3866/PKU.WHXB20051121 shu

Corrosion Resistance of Electroless Ni-P Deposits and Its Relation to P Contents

1.
College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005

Received Date: 5 April 2005
Available Online: 15 November 2005

By measuring polarization curves and alternating-current impedances, the corrosion resistance of electroless Ni-P deposits with P contents from 16.2% to 23.4%(x) was investigated in 5% (w) NaCl solution. It was found that there was a maximum of polarization resistance (Rp) when the P content was at 21%～22%(x) and the peak temperature of crystallization(Tp) of electroless Ni-P alloys, determinated by differential scanning calorimetry (DSC), also showed a maximum at such a P content. X-ray diffraction (XRD) experiments indicated that the electroless Ni-P deposits were amorphous. The maxima for both polarization resistance (Rp) and the peak temperature of crystallization(Tp) were explained in terms of the rhomb unit structure model (RUSM) for amorphous structures. The corrosion resistance of electroless Ni-P deposits was related to the changes of the bond numbers formed between metal (Ni) and metalloid element (P) with the P contents. The rationalization to adopt RUSM was also discussed by comparing the measured and theoretically calculated densities for electroless Ni-P deposits with various P contents.
- Electroless Ni-P deposits;Corrosion resistance;Amorphous structure; Deposits composition;The rhomb unit structure model
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