Studying Corrosion Protection with Nanostructured Polyimide Coatings by Electrochemical Impedance Spectroscopy

摘要

In this study the anti-corrosion performance of polyimides modified with benzoquinone fragment was evaluated and compared with polyimide missing this fragment. The electrochemical impedance spectroscopy was employed to investigate polyimides pyropolymellitimide-oxydianiline (PMDA-ODA), polyimide-benzoquinone (PIQ), and polyamidoimide (PAI). The nano-effect discovered in earlier work was successfully confirmed: the impedance of nanostructured polyimides increased after the treatment with the corrosive solution before coatings failure. Therefore nanostructured systems can be utilized for "smart" corrosion protection.