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Monday, 16 September 2019
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Raw materials & technologies, Technologies

A bulk electrochemical assessment of epoxy-phenolic coating degradation

Tuesday, 20 December 2016

Water absorption is believed to be one of the main causes leading to the deterioration and degradation of protective organic coatings. In a study, researchers present evidence that water ingress is not the main determinant of damage in epoxy-phenolic can coatings.

EIS was used to examine the degradation mechanism of intact epoxy-phenolic food can coatings. Source: Karin Schumann/pixelio.de

EIS was used to examine the degradation mechanism of intact epoxy-phenolic food can coatings. Source: Karin Schumann/pixelio.de

Thus, as the degree of cure is increased, the water saturated coating capacitance and resistance both increase while the time-to-failure also increases.

Results are supported by EIS

The scientists suggest that these observations are due, respectively, to an increase in the free polymer volume (permitting more water uptake) and to an increase in the charge transfer resistance at the metal-polymer interface (due to a higher density of polymer-to-substrate bonding). These results and interpretations are supported by local electrochemical impedance spectroscopy which has confirmed water absorption, coating failure and increased coating resistance for highly cured capacitive systems, at the microscale.

The study is published in: Progress in Organic Coatings, Volume 102, Part A, January 2017, Pages 88–98

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