Corrosion resistance enhancement of Ni-P-nano SiO2 composite coatings on aluminum
Source abstract
Abstract
Abstract In this study, the influences of different concentrations of SiO 2 nano sized particles in the bath on deposition rate, surface morphology and corrosion behavior of Ni-P-SiO 2 Composite coatings were investigated. The deposition rate of coating was influenced by incorporation of SiO 2 particles. The microstructure was investigated with field emission scanning electron microscopy (FESEM). The amount of SiO 2 was examined by Energy Dispersive Analysis of X-Ray (EDX) and amount of SiO 2 nanoparticles co-deposited reached a maximum value at 4.5 %wt. Corrosion behavior of coated aluminum was evaluated by electrochemical impedance spectroscopy (EIS) and polarization techniques. The results illustrated that the corrosion rate decreases (6.5–0.6 μA/cm 2 ) and the corrosion potential increases (−0.64 to −0.3) with increasing the quantity of the SiO 2 nanoparticles in the bath. Moreover, Ni-p-SiO 2 nano-composite coating possesses less porosity than that in Ni-P coating, resulting in improving corrosion resistance.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Electrodeposition and Electroless Coatings · Corrosion Behavior and Inhibition · Electrocatalysts for Energy Conversion
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