不同活化工艺对电解镍始极片结合力及性能的影响

目的为了提高电解镍始极片与基体的结合力,增加镀层耐蚀性能,改善镀层质量。方法通过采用不同的活化工艺对基体进行表面处理后制备镀层,采用划格法测试镀层与基体的结合力,用场发射电子扫描显微镜观察镀层与基体的截面形貌,用X射线衍射仪(XRD)分析镀层的相组成、应力以及镀层晶粒尺寸大小,用电化学工作站研究镀层的耐蚀性能。结果基体经过活化工艺处理后,镀层与基体结合均匀、致密、完整,大幅提高了镀层与基体的结合力,改善了镀层质量,镀层内应力由287.2 MPa降低到220.0 MPa,并且活化工艺不会给镀层引入其他杂质元素以及改变晶粒尺寸大小。电化学性能测试后发现,经过活化工艺后的镀层耐蚀性能增大,自腐蚀电位由-0.5481 V升高到-0.3980 V;自腐蚀电流密度由9.941μA/cm~2降低到2.927μA/cm~2。结论钛基体经过活化处理后,生成一层薄的活化膜,这层活化膜通过提高钛基体的表面活性,改变钛基体表面状态,来提高金属电沉积层与钛基体的结合强度,同时镀层的综合性能也得到了改善。

Influence of Different Activation Processes on Adhesion and Performance of Electrolytic Nickel Starting Sheet

Objective In order to improve the bonding strength between the electrode and the substrate, the corrosion resistance of the coating was increased, and the coating quality was improved.Methods The coating was prepared by using different activation processes on the surface of the substrate.The binding force between the coating and the substrate was tested by the grid method.The morphology of the cross section of coating and substrate was observed by field emission scanning electron microscope.Using X-ray diffractometer (XRD) analyze the coating phase composition, stress, and the grain size of coating.The corrosion resistance of coating was tested by electrochemical workstation.Results The results showed that the substrate after activation process, the coating and substrate with uniform, compact and complete, a substantial increase in the coating and substrate binding force and improve the quality of coating, the internal stress of the coating layer by 287.2MPa reduced to 220.0MPa, and activation process does not introduce other impurity elements and changing grain size size on coating.After the electrochemical performance test, the corrosion resistance of the coating was found to increase,and the self corrosion potential increased from -0.5481V to -0.3980V; the self corrosion current density decreased from 9.941uA/cm2 to 2.927uA/cm2.Conclusion After activation treatment of titanium substrate, generating a thin layer activation of membrane, the activated layer of the membrane by increasing the surface activity of titanium substrate , titanium substrate surface state of change and to improve the bonding strength of metal electrodeposition on the surface of titanium, also integrated performance of coating has also been improved.