Preparation and Corrosion properties of Electroless Ni-Zn-P Alloy Deposits

J Chin Soc Corr Pro

2004, Vol. 24

Issue (5): 297-300 DOI:

Research Report

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Preparation and Corrosion properties of Electroless Ni-Zn-P Alloy Deposits

Senlin Wang

华侨大学材料科学与工程学院

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Abstract Electroless Ni-Zn-P alloy deposits from an alkaline bath cntaining NH4Cl as a buffer agent and sodium citrate as a complexing agent was investigated. The effects of deposition parameters9pH,concentration of ZnSO4.7H2O and temperature)on the plating rate and the deposit composition was examined respectively. It was found that the presence of zinc in the bath has an inhibitory effect n the alloy deposition. As a consequence, the percentage of zinc in the electroless Ni-Zn-P alloys never reaches high values. The structure and the crystallization behavior of the deposit has been characterized by XRD and DSC. The results show that the as-plated deposits consist of mainly an amorphous structure together with some cubic phase Ni. The deposits crystallized into Ni3P at 384.8℃ and transformed into Ni5Zn21 at 580.7℃. The weight loss test and the anodic polarization measurements of the as-plated and the heat-treated deposits in 3.5mass% NaCl solution(pH7.0) indicate that the two deposits show good corrosion resistance, especially the as-plated deposit.

Key words: electroless plating Ni-Zn-P alloy crystallization corrosion

Received: 12 May 2003

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Corresponding Authors: Senlin Wang

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Cite this article:

Senlin Wang. Preparation and Corrosion properties of Electroless Ni-Zn-P Alloy Deposits. J Chin Soc Corr Pro, 2004, 24(5): 297-300 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2004/V24/I5/297

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