摘要：为了在碳钢表面获得具有高硬度、更高耐腐蚀性的Ni-B化学镀镀层，本课题设计了在化学镀镍硼镀液中添加稀土元素铈来研究化学镀镍硼镀层的结构和性能的影响，实验中采用电子扫描显微镜、能谱仪、电化学阻抗、显微硬度计分别对不同含铈量的镀层进行界面形貌、不同元素含量、硬度以及电化学阻抗等分析与检测。经研究分析得出：增加镀液中稀土Ce的含量，Ni-B合金镀层的硬度先大幅度升高，继续增加后有所下降，最后趋于平稳；在Ce=0.5g/L时镀层具有最大硬度为726.9HV。Ce的加入使镀层表面结构Ni-B更加的细小而致密，但超过0.5g/L时又会相对粗糙。随着镀液Ce的加入使得Ni-B化学镀合金镀层的抗腐蚀能力先上升后下降；当镀液中Ce=1.0g/L时镀层耐腐蚀能力最强。57463

毕业论文关键词：化学镀 镍-硼-铈 稀土元素 沉积机理

The Effect of Ce on the carbon steel surface Ni-P electroless plating

Abstract: In order to obtain the surface of carbon steel having a high hardness, high corrosion resistance of chemical plating Ni-B coatings, the subject of design adding rare earth elements cerium boron electroless nickel plating solution of electroless nickel boron to study the structure and properties impact study, scanning electron microscopy, energy dispersive spectroscopy, electrochemical impedance spectroscopy, microhardness respectively different amounts of cerium-containing coating interfacial morphology, element content, hardness and electrochemical impedance analysis and performance testing. Study results: With the increase of Ce content in the bath, the first significant increase in the hardness after slightly declined, finally stabilized; coating hardness reaches a maximum when the Ce content of 0.5g / l; Ce the accession of the originally excessive state structure becomes amorphous structure, the coating surface of the Ni-B clusters of small and more compact. With the accession of the post-Ce plating Ni-B alloy coating to increase corrosion resistance decreased; when the Ce content of the coating 1.0g / l maximum corrosion resistance.

Keywords: electroless nickel-boron-rare earth element cerium deposition mechanism

目  录

1绪论 1

1.1 课题背景及现状 1

1.1.1 化学镀 1

1.1.2 化学镀镍研究现状 1

1.1.3 化学镀Ni-B合金 2

1.2 稀土在金属表面处理上的应用 3

1.2.1 稀土元素Ce简介 3

1.2.2 稀土元素铈在金属材料中应用 3

1.2.3 稀土Ce对镍硼合金组织的作用 4

1.3 化学镀Ni-B合金的机理 4

1.4 理论意义及实际应用价值 6

1.5 方案论证 7

2实验部分 8

2.1 实验内容 8

2.2 实验材料 8

2.3 实验仪器装置 8

2.4 实验工艺设计 9

2.5 实验步骤 9

2.6 样品测试 10

3研究内容 11

3.1 稀土Ce对碳钢表面化学镀Ni-B镀层的硬度影响 11

3.2 稀土Ce对碳钢表面Ni-B化学镀层形貌的影响 12

3.3 稀土Ce对碳钢表面化学镀Ni-B合金抗腐蚀性能的影响