Slow release of corrosion-inhibitive paint pigments is a great challenge to the paint industry because of the urgent need to replace chromate-containing pigments. It was demonstrated that Tolyltriazole (TTA), benzotriazole (BTA) and 1,2,4-triazole (TA) are effective in protecting aerospace alloy AA2024-T3 from corrosion attack. Unfortunately, like most effective corrosion inhibitors, they are too soluble for use in paints. In this research, we present a novel method to modify these selected water-soluble organic inhibitors particles. A plasma polymerization technique was used to deposit an ultrathin polymer film on the surface of the inhibitor particles. Infrared spectroscopy (FTIR), time-of-flight secondary ion mass spectroscopy (TOFSIMS), scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM/EDX), transmission electron microscopy (TEM) and contact angle data confirmed the successful deposition of the polymer thin film on the inhibitor particles. Results showed that the surface of plasma-treated inhibitors can be modified from hydrophilic to hydrophobic and the encapsulated inhibitors can slowly release into the environment to protect a metal as needed. Using immersion tests and electrochemical impedance spectroscopy (EIS) technique we have demonstrated that the plasma-treated organic corrosion inhibitors can serve as pigments to protect AA2024-T3 from corrosion and the anti-corrosion property is competitive to chromate pigments. Therefore, plasma polymerizaton treatment of corrosion inhibitor is a feasible and promising method to promote the replacement of chromate pigments in paints.
|Advisor:||Van Ooij, Wim|
|School:||University of Cincinnati|
|School Location:||United States -- Ohio|
|Source:||MAI 57/06M(E), Masters Abstracts International|
|Keywords:||Aerospace, Alloys, Coatings, Corrosion, Inhibitor, Superprimer|
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