Evolution of electrochemical properties and digital modeling of composite polymer protective coatings in aggressive environments
Abstract
Evolution of electrochemical properties of multilayer polymer composite coatings and their constituent primer and inert insulating layers on various metal substrates in chloride media are considered.
It is shown that electrochemical models for typical functional coating layers (insulating and priming) can undergo significant changes during exposure in aggressive environments. The smallest changes are observed for an insulating layer with an inert polymer base and with inert fillers deposited on an inert (Pt) substrate: the digital model is described by the simplest equivalent circuit (ES) with one characteristic relaxation process over the entire exposure time range.
For the same coating on a corroding steel substrate, such a model is correct only at the initial stage of exposure. Later, as the under film corrosion develops, the ES evolves into a system with two relaxation processes. In primer coatings with a corrosive metal filler (Zn), the situation becomes more complicated and two relaxation processes are recorded from the initial exposure period.
For multilayer composite coatings containing spatially separated layers with active and inert fillers, three characteristic relaxation times are identified on a corroding steel substrate. This is in accordance with the model of multiphase layered bulk-filled polymer composites and justifies the use of additive Voit ES.
Digital models of the evolution of electrochemical properties for all the studied systems were proposed, including inert layers on steel and platinum, thin and multilayer Zn–filled primer layers and multilayer coatings of the listed materials at different temperatures in chloride media. The obtained results also allow us to propose a method of non-destructive EIS control of physico-chemical and corrosion processes in composite polymer protective coatings at different stages of exposure in aggressive environments.
About the Authors
V. A. Golovin
Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences
Russian Federation
Russian Federation
S. A. Dobriyan
Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences
Russian Federation
Russian Federation
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Golovin V.A., Dobriyan S.A. Evolution of electrochemical properties and digital modeling of composite polymer protective coatings in aggressive environments. Title in english. 2023;(2):97-120. (In Russ.)
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