SELF HEALING COATING ON ALLUMINIUM ALLOY (AA2014) USING SOL-GEL PROCESS
In this paper, a new doping concept has been improved which shows self-healing properties by sustained release of corrosion inhibitors in a carrier system. Zeolite were doped with two corrosion inhibitor cerium and 8-hydrxoquinoline in a sequential manner. 8-hydrxoquinoline and cerium are good corrosion inhibitor due to high inhibiting efficiency. The anti-corrosive properties on AA2014 aluminium alloy was tested by electrochemical impedance spectroscopy. The result shows that both inhibitors were successfully embodied in a sol-gel. The sol-gel coating doped with both inorganic and organic inhibitors give a satisfying result. Releasing the event of inhibitor depends on the pH value of the corrosion environment. The Loading extent of zeolite for 8-hydrxoquinoline inhibitor is more than cerium. The impedance itemization of sol-gel coating with 1 weight % gives different results in the doping process. The barrier properties of the best coating divulge by high pore resistance with having high impedance value at low frequency. The immersion test confirmed that the double doping concept is valuable for both long and short immersion times.
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