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Overview Of Latest Advances In Understanding The Limited Ability Of Fusion Bonded Epoxy To Stop Corrosion Within Disbondments

Product Number: 51321-16808-SG
Author: Facundo Varela; Mauricio Latino; Yongjun Tan; Maria Forsyth
Publication Date: 2021
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$20.00
$20.00

It has been hypothesized that fusion bonded epoxy (FBE) could be partially permeable to cathodic protection (CP, producing an imbalance between cathodic and anodic reactions and inducing a high pH environment within disbonded areas that would impede corrosion. However, this hypothesis arose from incorrectly inversing causes and effects by assuming that the only reason for the presence of a high pH environment under disbonded FBE coatings is their partial permeability to CP current. This work presents experimental measurements of the CP permeability of FBE coatings and its effects on mitigating corrosion using a recently developed electrochemical self-validating technique. Some degree of CP permeability has been found for FBE only after considerable hydrothermal aging. However, steel corrosion products had been found to significantly hinder the chances of generating a pH capable of inducing passivation, even for the most CP permeable coating tested.

It has been hypothesized that fusion bonded epoxy (FBE) could be partially permeable to cathodic protection (CP, producing an imbalance between cathodic and anodic reactions and inducing a high pH environment within disbonded areas that would impede corrosion. However, this hypothesis arose from incorrectly inversing causes and effects by assuming that the only reason for the presence of a high pH environment under disbonded FBE coatings is their partial permeability to CP current. This work presents experimental measurements of the CP permeability of FBE coatings and its effects on mitigating corrosion using a recently developed electrochemical self-validating technique. Some degree of CP permeability has been found for FBE only after considerable hydrothermal aging. However, steel corrosion products had been found to significantly hinder the chances of generating a pH capable of inducing passivation, even for the most CP permeable coating tested.

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