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超声波对低碳钢表面制备Ni-Mo合金沉积层的影响研究

时间:2020-10-16 18:02来源:毕业论文
在不同功率下超声辅助硫酸-柠檬酸浴直流电电镀镍钼合金的影响。主要研究了超声参数对镍钼合金镀层的微观结构、晶粒尺寸、硬度、钼含量、表面粗糙度、耐腐蚀性的影响

摘要:本实验研究的是在不同功率下超声辅助硫酸-柠檬酸浴直流电电镀镍钼合金的影响。主要研究了超声参数对镍钼合金镀层的微观结构、晶粒尺寸、硬度、钼含量、表面粗糙度、耐腐蚀性的影响。XRD表明超声波降低了纳米晶合金镀层晶粒尺寸。在超声辅助下镍钼镀层镀层的硬度显著提高。SEM和AFM图像表明有超声结合镀层表面粗糙度降低,得到光滑的镀层。由塔菲尔极化曲线和电化学阻抗谱发现,与无超声波辅助的镀层对比有超声波辅助的镍钼镀层耐腐蚀性显著增强。沉积物的特性依赖于所采用的超声功率,但在最大超声波功率(270瓦),镍钼合金镀层的钼含量、晶粒尺寸,粗糙度、显微硬度和耐腐蚀性的都略有下降。58137

毕业论文关键词: 镍钼合金镀层;电沉积;超声波;耐蚀性 

Effect of ultrasonication on the surface of low-carbon steel to produced Ni–Mo coatings

Abstract: The effect of ultrasound-assisted method on Ni–Mo alloy coatings by direct current (DC) electroformation from sulphate–citrate bath was investigated with different ultrasonic powers. This study focused on the microstructure, grain size, hardness,molybdenum content, surface roughness and corrosion resistance of the Ni–Mo alloy coatings, which were influenced by the ultrasonic parameters. X-ray diffraction results showed that ultrasonic modification decreased the grain size of nanocrystalline alloy coatings. The hardness of Ni Mo coating was significantly improved by ultrasonic assisted. SEM and AFM images show that there is ultrasound-assisted, the surface roughness of the coating is reduced, and the smooth coating is obtained. By Tafel polarisation curve and electrochemical impedance spectroscopic found, the corrosion resistance of Ni–Mo coating was significantly enhanced compared with the coating without ultrasonic assistance. Characteristics of sediment from dependence on the ultrasonic power, but at maximum ultrasonic power (270 watts), the molybdenum content, grain size, roughness, microhardness and corrosion resistance of the Ni–Mo alloy coatings all slightly decreased.

Keyword: Ni–Mo alloy coatings;Electroposition;Ultrasonic;Corrosion resistanc 

目录 

1 绪论 1

1.1前言 1

1.2文献综述 1

1.3合金共沉积 2

1.3.1合金共沉积的条件 2

1.3.2合金共沉积的类型 3

1.4超声波电镀镍 3

1.5超声波电镀铜 4

1.6超声波电镀锌 4

1.7超声波电镀镍基合金 4

1.8超声波电镀镍基复合镀层 5

1.9超声波对电沉积的作用机理 6

1.9.1强化电沉积过程 6

1.9.2搅拌分散作用 6

1.9.3除气和除杂作用 6

1.9.4清洗和活化作用 6

1.9.5细化镀层晶粒 6

2 实验方法与仪器 7

2.1 实验材料与实验仪器 7

2.1.1实验材料 7

2.1.2 实验仪器 7

2.2 实验过程 7

2.3 镀后样品检测 超声波对低碳钢表面制备Ni-Mo合金沉积层的影响研究:http://www.lwfree.com/huaxue/lunwen_63099.html

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