脉冲电沉积纳米结构镍-碳化硅复合涂层的腐蚀行为

Corrosion behavior of pulse electrodeposited nanostructure Ni-SiC composite coatings.

作者信息

Amadeh A, Rahimi A, Farshchian B, Moradi H

机构信息

School of Metallurgy and Materials Engineering, University College of Engineering, University of Tehran, PO Box 11155-4563, Tehran 14395, Iran.

出版信息

J Nanosci Nanotechnol. 2010 Aug;10(8):5383-8. doi: 10.1166/jnn.2010.1931.

DOI:10.1166/jnn.2010.1931

PMID:21125903

Abstract

Ni-SiC nano-composite coatings with various contents of SiC were prepared by pulse electrodeposition from a modified Watts bath containing SiC nano-particles. The effect of SiC concentration, current density, duty cycle and pulse frequency on the corrosion behavior of the coatings was investigated by means of potentiodynamic polarization and Electrochemical Impedance Spectroscopy (EIS) methods. It has been found that the Ni-SiC composite coatings show better corrosion resistance in a 3.5% NaCI solution than pure nickel. The corrosion resistance of the coatings increases by increasing the amount of embedded SiC particles. This improvement can be attributed to the morphology and the crystallographic texture of the coatings.

摘要

通过脉冲电沉积法，在含有碳化硅纳米颗粒的改良瓦特镀液中制备了具有不同碳化硅含量的镍-碳化硅纳米复合涂层。采用动电位极化和电化学阻抗谱（EIS）方法，研究了碳化硅浓度、电流密度、占空比和脉冲频率对涂层腐蚀行为的影响。研究发现，镍-碳化硅复合涂层在3.5%氯化钠溶液中的耐蚀性优于纯镍。涂层的耐蚀性随着嵌入碳化硅颗粒数量的增加而提高。这种改善可归因于涂层的形态和晶体织构。