Electrochemical Evaluation Of A High Solid
Coating In Acid Media
Author(s)
M. Bethencourt, F. J. Botana, M. J. Cano, R. M. Osuna
& J. M. Sanchez-Amaya
Abstract
In the present work a two-component solvent free amine cured epoxy coating
was used to protect carbon steel. The coated metal was immersed in an
aggressive acid solution and monitored by means of electrochemical techniques:
Electrochemical Impedance Spectroscopy (EIS) and Electrochemical Noise
(EN). These techniques were used to evaluate the coating degradation evolution.
The values of the pore resistance Rpo, the impedance at 0.1 Hz (calculated by
means of both EIS and EN), and noise resistance (Rn) were the main parameters
calculated with the aim of monitoring the evolution of the system along the
immersion time. An excellent correlation among the EIS and EN data was found.
Keywords: EIS, ENM, coating, carbon steel, degradation, acidic media.
1 Introduction
Increasing the percentage of solids in conventional solventborne paints has
represented one of the first attempts to decrease the volatile organic compounds
(VOC) content of a coating formulation and comply with increasingly stringent
environmental requirements [1]. Traditional high solid coatings use less paint to
achieve the same thickness obtained with other conventional formulations. This
results in the volatilization of less solvent into the environment.
By definition, a high solids coating typically contains greater than 60% solids
by weigh or 80% solids by volume [2]. This technology solution is currently
accepted by the automotive, aerospace, and marine industries for use in a variety
of formulations. The major advantage associated with the use of this kind of
coatings is that the same equipment can be used to apply new high solids and
conventional solventborne paints. On the contrary, the major disadvantage with
Keywords
EIS, ENM, coating, carbon steel, degradation, acidic media.
Related Book
Other papers in this volume
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