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Indexed by:期刊论文

Date of Publication:2016-10-01

Journal:OCEAN ENGINEERING

Included Journals:SCIE、EI、Scopus

Volume:125

Page Number:134-146

ISSN No.:0029-8018

Key Words:Steel plate element; Corrosion model; EIS; Elastic stress; Lifetime assessment

Abstract:In this study, the effect of low levels of elastic stress on corrosion behavior of Q235B steel in an aerated 3.5% NaCl solution was investigated through measurements of linear polarization resistance (LPR), potentiodynamic polarization characteristics and electrochemical impedance spectra (EIS). Through theoretical analysis and experimental results, new corrosion models which can distinguish the effect of mechanical stress on the corrosion process of actual marine structures have been respectively proposed on the basis of three representative existing corrosion models. The effect of corrosion models on lifetime assessment was studied by employing a steel plate element subjected to the combined effects of corrosion and mechanical stress. Analytical expressions have been obtained for the structure's lifetime, which is identified with the time when the stress reaches the yield level. An example was presented to demonstrate the combined effects of corrosion and elastic stress on the lifetime assessment of marine structures. (C) 2016 Elsevier Ltd. All rights reserved.