Study on the Growth Mechanism of Zinc-Iron-Nickel Alloy on Aluminum Substrate with Different Zinc Immersion Times

MAO Zhijun, WU Danhong, ZHANG Xinqi, ZHOU Jie, CHEN Haibo, ZHENG Jingwu

doi:10.16577/j.issn.1001-1560.2025.0024

Materials Protection >

2025 , Vol. 58 >Issue 2: 66 - 72

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0024

Study on the Growth Mechanism of Zinc-Iron-Nickel Alloy on Aluminum Substrate with Different Zinc Immersion Times

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(1.Zhejiang Apeloa Jiayuan Pharmaceutical Co.， Ltd.， Jinhua 322118， China；2.College of Materials Science and Engineering， Zhejiang University of Technology， Hangzhou 310014， China)

ZHENG Jingwu(1975-)，Ph.D.， Research Fellow，Research Focus:Magnetoelectric Functional Materials and Metal Surface Treatment，E-mail: zhengjw＠zjut.edu.cn

Received date: 2024-07-29

Revised date: 2024-08-31

Accepted date: 2024-09-10

Online published: 2025-03-20

Supported by

National Natural Science Foundation of China(52101235)；Basic Public Welfare Research Program of Zhejiang Province(LGG22E010010)

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Abstract

In order to improve the adhesion of the zinc alloy coating on the surface of aluminum， the reaction mechanism of the Zn-Fe-Ni alloy replacement layer formed on the surface of pure aluminum in alkaline solution was discussed， and a corresponding nucleation model was established.The morphology and composition of the zinc alloy replacement layer under varying zinc immersion times and zinc immersion temperatures were analyzed using scanning electron microscopy (SEM) and X-ray fluorescence spectroscopy (XRF) respectively.Results showed that in the early stage of the immersion plating reaction，iron and nickel are superior to zinc in forming crystal nuclei at the catalytic active points on the surface of aluminum， while in the later stage of the reaction， zinc coordination compounds dissociated and adsorbed onto the aluminum surface， where crystal nuclei had already formed， thereby slowing down the growth of iron and nickel crystal nuclei， while nucleation and growth of zinc dominated，displaying an abnormal co-deposition phenomenon.During the abnormal co-deposition stage，the zinc alloy replacement layer gradually grew on the aluminum surface in a “point-line-plane” mode.That is， crystal nuclei were first generated at the active sites， followed by the growth of adjacent crystal nuclei into linear particles， and then a second layer of crystal nuclei was generated at the edges or concave-convex areas of the linear particles.This overlapping growth of layers caused the replacement layer to become denser， thicker， and to gradually cover the aluminum substrate.The number of fine crystal nuclei generated in the initial reaction is the key to the rapid formation of thin and dense zinc immersion layer.

Key words： Zn-alloy immersion; pure aluminum; anomalous co-deposition; nucleation model

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MAO Zhijun, WU Danhong, ZHANG Xinqi, ZHOU Jie, CHEN Haibo, ZHENG Jingwu . Study on the Growth Mechanism of Zinc-Iron-Nickel Alloy on Aluminum Substrate with Different Zinc Immersion Times[J]. Materials Protection, 2025 , 58(2) : 66 -72 . DOI: 10.16577/j.issn.1001-1560.2025.0024

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