engleski

Structural and Protecting Properties of Functional Organic Coatings on Copper

It was demonstrated that self-assembly of n-alkanethiol coatings on copper surface could be a convenient way for its protection against corrosion. The goal of investigations presented in this work was to develop method that produces reproducible n-alkanethiol coatings with excellent barrier-protecting characteristics and structural integrity without pinholes. It was shown that kinetics of self-assembly process can be significantly affected by applying potential and repetitive potential cycling in the potential range in which cathodic or anodic desorption does not occur. Thus, close packed, oriented n-alkanethiol films were formed on copper surface using this relative new approach of surface modification. Electrochemical (corrosion) properties of Cu-covered electrodes of two types (self-assembled monolayers-SAM and electrochemically-modified films) were examined in 0.5 M NaCl solution. Polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) and electrochemical impedance spectroscopy (EIS) revealed that the ability of these SAMs to maintain their orientation and barrier properties upon exposure to corrosive environments depends directly on their molecular structure and conformation, respectively.

copper; self-assembly; n-alkanethiols; protecting properties

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