为了更深地认识CNTs对Ni-P镀层电化学腐蚀性能的影响,采用复合化学镀技术,通过向优化的化学镀溶液中加入碳纳米管的方法在45~#钢基材上制备了Ni-P-CNTs复合镀层,并用相同工艺在45~#钢基材上直接化学镀Ni-P镀层作为对比.采用SEM/EDAX,XRD和TEM综合分析了复合镀层的形貌和结构,分析表明:所得镀层t,X非晶结构为主,碳纳米管均匀分布在镀层中.采用动电位极化及交流阻抗技术对比研究了Ni-P-CNTs复合镀层及纯Ni-P镀层在0.5mol/L NaCl+0.05mol/L H_2SO_4酸性溶液中的电化学腐蚀行为,腐蚀实验结果表明:在该介质溶液中,与不含碳纳米管的Ni-P镀层相比,Ni-P-CNTs复合镀层的自腐蚀电位和自腐蚀电流密度较低,耐均匀腐蚀性能得到明显改善;此外,碳纳米管的加入还明显提高了Ni-P镀层在该介质溶液中的耐点蚀性能.
Ni-P-carbon nanotubes (CNTs) composite coatings as well as Ni-P coatings on 45~# steel were pre-pared by electroless plating in order to investigate the effect of CNTs on the corrosion of the electroless Ni-P coating. The characteristics and microstrucrure of the coatings were assessed by SEM/EDAX, XRD and TEM. The results indicate the co-deposited CNTs are homogeneously dispersed in the mainly amorphous Ni-P alloys. The electrochemical corrosion be-havior of the electroless Ni-P and Ni-P-CNTs composite coating in solutions of 0.5mol/L NaCl +0.05mol/L H_2SO_4 was investigated by using potentiodynamic polarization and capacitance measurement. The results show that the codeposited CNTs not only decrease the corrosion potential (E_(corr)) and corrosion current (i_(corr)), but also increase the susceptibility to pitting corrosion of Ni-P coating.
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