Microstructure and corrosion properties of ZnCo-CNT composite coatings
ZnCo coatings have already been known to increase the corrosion resistance of mild steel plates by using Zn and Co in specific proportions and at certain atmospheric conditions. In this project, microstructural and electrochemical behaviour of Zn rich, ZnCo-CNT composite coatings on mild steel plates was examined. Studies have been done to find if addition of CNT (Carbon nanotubules) to the coatings leads to an improvement in the corrosion resistance of mild steel as compared to pure zinc coatings. The corrosion behaviour of coatings was analyzed with the help of tafel plots which showed that the corrosion resistance of the coatings was sensitive to the presence of CNT. An expected change of corrosion resistance suggests that its value, as compared to that of the pristine coatings, should increase with CNT addition. The morphological and compositional studies were done with the help of SEM and EDS respectively. After this, the corrosion resistance of the coatings will be correlated to the textural changes developed during electrodeposition.
Keywords: corrosion resistance, morphology, electrodeposition, carbon nanotubes