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Wednesday, 01 April 2020
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Raw materials & technologies, Science today - coatings tomorrow

Behaviour of epoxy coating at hydrostatic pressure of seawater studied

Monday, 15 April 2013

New study investigates EIS characteristic of epoxy coating in simulated deep-sea environment. High pressure of seawater accelerated the coating physical failure, and chemical structures of the coating did not change during the experiment.

New study investigates EIS characteristic of epoxy coating in simulated deep-sea environment / Source: Rainer Sturm, Pixelio

New study investigates EIS characteristic of epoxy coating in simulated deep-sea environment / Source: Rainer Sturm, Pixelio

Chinese researchers studied the evolution of impedance models and water transport behaviours of epoxy coating on 907A steel surface in simulated deep-sea environment.

By the fitting analysis of the electrochemical impedance spectroscopy (EIS), three equivalent electrical circuits (EEC) were proposed to the epoxy coating/907A steel system at 25 atm hydrostatic pressure for different immersion stages: good barrier property of the coating (Circuit A), active corrosion period at the beginning (Circuit B), and finally emergency of diffusion impedance (Circuit C).

High pressure accelerated diffusion rates of seawater into epoxy coatings, this shortened the period of water uptake of the coating that reached saturation. The similar chemical structures of epoxy coatings at two kinds of hydrostatic pressure were found from the Fourier transform infrared spectroscopy (FT-IR) – attenuated total reflection (ATR) measurements. High pressure of seawater accelerated the coating physical failure, and chemical structures of the coating did not change during the experiment.

The complete article "Studies of impedance models and water transport behaviours of epoxy coating at hydrostatic pressure of seawater” will appear in Progress in Organic Coatings.

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