摘要:
通过电沉积法制备了Ni-Sn/TiO2复合镀层,采用扫描电镜、能谱仪、Tafel曲线和电化学阻抗谱研究了搅拌速率对Ni-Sn/TiO2复合镀层的表面形貌、成分和耐蚀性的影响。结果表明:随着搅拌速率的增加,镀层中TiO2含量先增加后减小。当搅拌速率为40 r/min时,TiO2含量最大,此时,镀层表面无裂纹,晶粒细小且分布均匀。通过Tafel曲线和电化学阻抗谱分析可知,随着搅拌速率的增大,镀层的耐蚀性先增强后减弱。当搅拌速率为40 r/min时,镀层具有最正的腐蚀电位,最低的腐蚀电流密度和最大的电荷转移电阻,耐蚀性最好。
Abstract:
The Ni-Sn/TiO2 composite coatings were prepared by electrodeposition. The effects of stirring rate on surface morphology,composition and corrosion resistance of Ni-Sn/TiO2 composite coatings were studied by scanning electron microscopy,energy dispersive spectroscopy,Tafel curve and electrochemical impedance spectroscopy.The results show that with the increase of stirring rate,TiO2 content in the coating first increases and then decreases.When the stirring rate is 40 r/min,the maximum content of TiO2 is obtained.Meanwhile,there is no crack on the surface of the coating,and the grains are fine and evenly distributed.According to Tafel curve and electrochemical impedance spectroscopy analysis,with the increase of stirring rate,the corrosion resistance of the coating is improved first and then weakened.When the stirring rate is 40 r/min,the coating possess the most positive corrosion potential,the lowest corrosion current density,the largest charge transfer resistance,and the best corrosion resistance.
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