A series of linear hydrophobic polymeric antioxidants has been synthesized and studied as active components of anticorrosion coatings on aluminum 2024 T3 substrates. This aluminum alloy is widely used for aircraft and aerospace applications. The polymers are composed of methacrylamide units carrying hydrophobic hexyl and antioxidant 3,4,5-trihydroxy or 3,4-dihydroxy benzyl moieties. Polyphenol groups provide excellent adhesion of the polymers to the pretreated mirror-polished aluminum substrates as shown by X-ray photoelectron spectroscopy (XPS). The anticorrosion efficiency of the coatings was studied using electrochemical impedance spectroscopy and open-circuit potential techniques when substrates were immersed in a corrosive environment provided by 3.5% sodium chloride solution exposed to ambient air. The coated aluminum substrates demonstrated an increase in impedance as compared to bare aluminum surfaces. The anticorrosion activity of the coatings is likely due to the formation of a protective layer of the oxidation products. The morphological and chemical changes induced by corrosion were analyzed by scanning electron microscopy (SEM) and XPS. The anticorrosion efficiency of the polymers, when used as additives to barrier epoxy coatings, will be discussed.

Linear antioxidant polymers for anticorrosion coatings: Adhesion and electrochemical performance

254th National Meeting (2017)

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