Abstract
Composite electrodeposits of Zn-Ni/SiO 2 were produced electrolytically using direct current. Their corrosion resistance characteristics were investigated through the use of neutral salt spray, linear polarisation resistance and potentiodynamic anodic polarisation methods. Neutral salt spray data shows that times to 5% red rust were longer for the coatings embedded with SiO 2 particles than those without particles. Effect of current density shows that deposits produced at higher current densities consistently exhibited a tendency to decrease in corrosion resistance. In addition, the linear polarisation resistance of coatings containing SiO 2 tends to increase with increasing particle content up to 5.5wt% SiO 2 and then decreases. However, there was no significant difference observed for the anodic dissolution current densities for coatings containing SiO 2 particles and their SiO 2-free counterparts. The mode of protection appears to be a combination of sacrificial and barrier protection to the underlying steel substrate
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