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07013 Electrochemical characterization of epoxy coated steel under cathodic protection

Product Number: 51300-07013-SG
ISBN: 07013 2007 CP
Author: Gyeong Rae Kim, Sang Hyeok Lee, Hyang Yeon Song, and Jong Man Han
Publication Date: 2007
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$20.00
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Both organic coatings and SACP (Sacrificial Anode Cathodic Protection) system have been used to protect the steel surface from the corrosion in the water ballast tanks of ships and offshore structures. This study was aimed at the effectiveness of SACP added to the epoxy coated steels. It is also found that the EIS parameters would be represented electrochemical characteristics of epoxy coated steel with or without the artificial defect and under CP. Despite the intact coating, the epoxy coated steel is cathodically polarized below -0.79V/SCE by sacrificial anode after several hours for the beginning of the immersion. EIS spectrum of epoxy coated steel under CP shows a two time constants and AC impedance modulus decreases. Consequently, the cathodic reaction at coating/substrate interface can effectively control the rust of substrate under the coating in spite of fact that epoxy coatings are sound and intact.
Both organic coatings and SACP (Sacrificial Anode Cathodic Protection) system have been used to protect the steel surface from the corrosion in the water ballast tanks of ships and offshore structures. This study was aimed at the effectiveness of SACP added to the epoxy coated steels. It is also found that the EIS parameters would be represented electrochemical characteristics of epoxy coated steel with or without the artificial defect and under CP. Despite the intact coating, the epoxy coated steel is cathodically polarized below -0.79V/SCE by sacrificial anode after several hours for the beginning of the immersion. EIS spectrum of epoxy coated steel under CP shows a two time constants and AC impedance modulus decreases. Consequently, the cathodic reaction at coating/substrate interface can effectively control the rust of substrate under the coating in spite of fact that epoxy coatings are sound and intact.
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