Materials Performance

MAY 2015

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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41 NACE INTERNATIONAL: VOL. 54, NO. 5 MATERIALS PERFORMANCE MAY 2015 20 mm. To prepare an artificial disbond- ment, the FBE membrane (200 μm in thick- ness) was applied on the steel surface using a double-sided self-adhesive tape. The gap between FBE and the steel was defined as the disbonding thickness. Tape with a known thickness was layered to establish the desired gap, which was verified with a coating thickness gauge. The FBE mem- brane was applied to the tape, which was then applied on the steel surface. The tape was removed to form artificial FBE dis- bondments over the steel. The boundaries of the steel/coating assembly were sealed with an epoxy resin. A 10-mm diameter hole was opened on the coating to simulate a holiday, with six FIGURE 1 Schematic diagram of the experimental setup simulating a disbonding crevice under coating and the potential/solution pH measurements. FIGURE 2 Time dependence of the distributions of local potential under disbonded coating (disbonding thickness of 120 µm) at varied disbonding depths from the open holiday where the steel was either at corrosion potential (a) or at CP potentials of –0.875 V vs. SCE (b) and –0.975 V vs. SCE (c), respectively.

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