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Citation: Jiang Taixiang, Wu Huihuang, Mao Bingwei, Zhou Shaomin. Electrochemical Corrosion Behaviour of Electroless Nickel-Phosphorus Alloys in 35%NaOH Solution[J]. Chinese Journal of Applied Chemistry, ;1999, 16(3): 21-24. shu

Electrochemical Corrosion Behaviour of Electroless Nickel-Phosphorus Alloys in 35%NaOH Solution

1.
Department of Chemistry, Xiamen University, State Key Laboratory for Physical Chemistry of the Solid Surface, Xiamen 361005

Received Date: 11 November 1998
Available Online: 17 March 1999

The corrosion behavior of electroless Ni-P deposits on the carbon steel in deaerated 35%NaOH solution have been studied by potentiodynamic polarization method, electrochemical impedance spectroscopy(EIS) technique and atomic force microscopy(AFM). The results showed that the anodic polarization behavior of the Ni-P deposit with high P content were very similar to that of low P deposit, but the corrosion current densities of the high P deposit were much lower than that of the low P deposit. The low phosphorus deposit exhibited a rounded-mound structure surrounded by fairly deep crevices and the size of the nodules varied from 0.1~0.5 μm, the depth of the crevices was about 10~20 nm. The high phosphorus deposit exhibited a more uniform and smoother surface structure, the size of the nodules was smaller and the depth of the crevices was approximately 2~5 nm.
- electroless plating,
- Ni-P alloy,
- microstructure,
- corrosion electrochemistry
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