Effect of carbon nano-tubes on the corrosion resistance of alkyd coating immersed in sodium chloride solution

• Influence of CNTs on the protective properties of the alkyd resin film.
• Addition of CNTs improves the corrosion resistance of the alkyd resin.
• Addition of CNTs improves the adhesion strength of alkyd resin.
• No blisters, pin-holes and delamination for alkyd resin containing 0.5% CNTS.

Effect of carbon nano-tubes (CNTs) on corrosion protection of carbon steel coated by alkyd resin and tested after immersion in 3.5% NaCl solution for different periods was evaluated by electrochemical impedance spectroscopy (EIS) measurements and scanning electron microscopy (SEM) investigations. Changes in the impedance characteristics of the systems were found to be greatly affected by the percentage of CNTs. Degradation of alkyd resin film without CNTs was observed after 72 h. On other hand no blisters, pin-holes and delamination were observed for alkyd resin containing 0.5% CNTs. It was found that CNTs improved the corrosion resistance and the adhesion strength of alkyd resin.

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