Effect of corrosion inhibition on the mitigation of preferential weld corrosion in seawater transport systems
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© 2015 by Nace International. The scanning electrochemical microscope (SECM) is being used to investigate the effect of corrosion inhibition in the mitigation of preferential weld corrosion (PWC). Using the in-situ electrochemical methodology combined with the high spatial resolution at a microscopic level capability of the SECM to assess corrosion current distribution across the exposed surface of PWC susceptible welds in an environment simulating a seawater transport. The data from the SECM evaluation of PWC affected surface, strongly suggests that the anodic current distribution between the heat-affected zones (HAZ), weld and base metal is affected by the concentration of corrosion inhibition present. The results obtained indicate that under dosage of corrosion inhibition, at least in a seawater system, can cause localized corrosion attack in PWC susceptible HAZ.
author list (cited authors)
Case, R., Achour, M., & Ning, J.