Incorporation of corrosion inhibitor in plasma polymerized allyl methacrylate coatings and evaluation of its corrosion performance

By positioning the layer containing Ce(dbp)3 close to the coating-metal interface, the effective use of the inhibitor is promoted, as the leaching out towards the metal surface is facilitated. The chemical nature of Ce(dbp)3 did not undergo any significant change due to the plasma discharge. The coatings with Ce(dbp)3 were compared with equivalent coatings without incorporated corrosion inhibitor and it was shown that Ce(dbp)3 improved the corrosion performance when the coating was mechanically damaged. Optical evaluation of the coatings showed a significant decrease in the corrosion, especially in the area under the coating. However, the low corrosion resistance values obtained by electrochemical impedance spectroscopy indicate that corrosion was not inhibited all over the scribed area.