电刷镀Ni-SiC纳米复合镀层的制备及表征
发布时间：2018-10-13 09:20
【摘要】：电刷镀技术是属于电沉积技术的一项分支,因其具有操作简单、镀层沉积速度较快、费用较低等优点而被广泛应用于各个工业领域当中。本文确定了制备Ni-SiC纳米复合镀层的各项工艺参数以及镀液的组成,通过在刷镀液中添加SiC粒子,获得了Ni-SiC纳米复合镀层。研究了电刷镀液中的硫酸镍浓度、络合剂浓度、镀液的pH值以及工作电压、相对运动速度等因素对镀层沉积速率、SiC复合量以及镀层显微硬度的影响。其次,利用扫描电镜对Ni-SiC纳米复合镀层的表面形貌进行观察,并利用扫描电镜所配套的EDS能谱仪对复合镀层成分进行检测分析。结果表明:采用适宜的工艺条件以及合理的化学药品搭配可得到较快的镀层沉积速度、较高的SiC粒子复合量及较强的硬度。经SEM分析发现,拥有较高SiC粒子复合量的镀层表面形貌相较于普通纯镍镀层具有更加平整、光滑的表面以及致密的组织结构,镀层裂纹数量显著减少,因此说明SiC粒子可显著提升镀层紧密程度,降低镀层内应力。腐蚀试验结果表明,Ni-SiC纳米复合镀层比纯镍镀层具有更好的耐腐蚀性能;孔隙率试验结果表明,镀层厚度影响着镀层孔隙率的大小,当镀层厚度达到25μm时,Ni-SiC复合镀层的空隙率率先达到0,而当镀层厚度为30μm时,纯镍镀层的孔隙率为0,因此说明Ni-SiC复合镀层的结构相较于纯镍镀层更加致密,质量较好;镀层结合强度实验表明,纯镍镀层与Ni-SiC复合镀层的结合强度均表现良好,相差无几;摩擦磨损试验结果表明,随着摩擦时间的推移,Ni-SiC纳米复合镀层的磨损量要明显小于纯镍镀层,且经SEM分析,纯镍镀层在磨损以后出现分层现象,而Ni-SiC纳米复合镀层则无此现象出现,也证明了Ni-SiC纳米复合镀层的耐磨性要优于纯镍镀层。当氧化温度在600℃~850℃之间时,Ni-SiC纳米复合镀层的抗高温氧化能力要优于纯镍镀层。
[Abstract]:Brush plating is a branch of electrodeposition technology, which is widely used in various industrial fields because of its advantages of simple operation, fast deposition speed and low cost. In this paper, the process parameters and the composition of Ni-SiC nano-composite coating were determined. The Ni-SiC nano-composite coating was obtained by adding SiC particles into the brush plating solution. The effects of nickel sulfate concentration, complexing agent concentration, pH value, working voltage and relative movement speed on the deposition rate, SiC recombination amount and microhardness of the coating were studied. Secondly, the surface morphology of Ni-SiC nanocomposite coating was observed by scanning electron microscope (SEM), and the composition of composite coating was analyzed by EDS spectrometer. The results show that the deposition rate, the amount of SiC particles and the hardness of the coating can be obtained by using the appropriate process conditions and the reasonable combination of chemicals. By SEM analysis, it was found that the surface morphology of the coating with higher SiC particle recombination amount was more smooth, smooth surface and compact structure than that of the ordinary pure nickel coating, and the number of cracks in the coating decreased significantly. Therefore, SiC particles can significantly improve the closeness of the coating and reduce the internal stress of the coating. The corrosion test results show that the corrosion resistance of Ni-SiC nanocomposite coating is better than that of pure nickel coating, and the porosity test shows that the thickness of the coating affects the porosity of the coating. When the coating thickness is up to 25 渭 m, the porosity of Ni-SiC composite coating reaches 0 first, while when the thickness of coating is 30 渭 m, the porosity of pure nickel coating is 0. Therefore, the structure of Ni-SiC composite coating is more compact and the quality is better than that of pure nickel coating. The bonding strength of pure nickel coating and Ni-SiC composite coating is similar to that of pure nickel coating, and the results of friction and wear test show that the bonding strength of pure nickel coating is similar to that of Ni-SiC composite coating. With the increase of friction time, the wear amount of Ni-SiC nanocomposite coating is obviously smaller than that of pure nickel coating. After SEM analysis, the pure nickel coating appears delamination after wear, but Ni-SiC nanocomposite coating does not. It is also proved that the wear resistance of Ni-SiC nanocomposite coating is better than that of pure nickel coating. When the oxidation temperature is between 600 鈩，
本文编号：2268077
[Abstract]:Brush plating is a branch of electrodeposition technology, which is widely used in various industrial fields because of its advantages of simple operation, fast deposition speed and low cost. In this paper, the process parameters and the composition of Ni-SiC nano-composite coating were determined. The Ni-SiC nano-composite coating was obtained by adding SiC particles into the brush plating solution. The effects of nickel sulfate concentration, complexing agent concentration, pH value, working voltage and relative movement speed on the deposition rate, SiC recombination amount and microhardness of the coating were studied. Secondly, the surface morphology of Ni-SiC nanocomposite coating was observed by scanning electron microscope (SEM), and the composition of composite coating was analyzed by EDS spectrometer. The results show that the deposition rate, the amount of SiC particles and the hardness of the coating can be obtained by using the appropriate process conditions and the reasonable combination of chemicals. By SEM analysis, it was found that the surface morphology of the coating with higher SiC particle recombination amount was more smooth, smooth surface and compact structure than that of the ordinary pure nickel coating, and the number of cracks in the coating decreased significantly. Therefore, SiC particles can significantly improve the closeness of the coating and reduce the internal stress of the coating. The corrosion test results show that the corrosion resistance of Ni-SiC nanocomposite coating is better than that of pure nickel coating, and the porosity test shows that the thickness of the coating affects the porosity of the coating. When the coating thickness is up to 25 渭 m, the porosity of Ni-SiC composite coating reaches 0 first, while when the thickness of coating is 30 渭 m, the porosity of pure nickel coating is 0. Therefore, the structure of Ni-SiC composite coating is more compact and the quality is better than that of pure nickel coating. The bonding strength of pure nickel coating and Ni-SiC composite coating is similar to that of pure nickel coating, and the results of friction and wear test show that the bonding strength of pure nickel coating is similar to that of Ni-SiC composite coating. With the increase of friction time, the wear amount of Ni-SiC nanocomposite coating is obviously smaller than that of pure nickel coating. After SEM analysis, the pure nickel coating appears delamination after wear, but Ni-SiC nanocomposite coating does not. It is also proved that the wear resistance of Ni-SiC nanocomposite coating is better than that of pure nickel coating. When the oxidation temperature is between 600 鈩，
本文编号：2268077
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