Electrochemical method of control OF in-service degradation OF the marine portal cranes steels mechanical properties
Journal Title: Вісник Тернопільського національного технічного університету - Year 2015, Vol 77, Issue 1
Abstract
At the assessment of the technical state of marine port structures it is important not only to detect in-service damages, but also to evaluate current physico-mechanical properties of the long-term operated steels. The presence of cyclic mechanical loading and marine corrosive environment is the peculiarity of the service conditions of the port structures. This peculiarity is an essential factor in reducing of metal plasticity and, consequently, lowering resistance to brittle fracture. On the other hand, the change of metal state as a result of long-term service causes changing the electrochemical characteristics of metal-environment system. The paper is devoted to a finding general regularities of the mechanical properties operational degradation of portal structures steels and electrochemical parameters, which are sensitive to in-service changes in a metal, building correlation between them; and developing on this basis the engineering approach of non-destructive diagnostics of the technical state of portal cranes steels. The general regularities of the operational degradation of mechanical and electrochemical properties of marine portal cranes steels were studied. A significant reduction of brittle fracture resistance of long-term operated steels was found that should be taken into account at an assessment of their technical state. It was shown, that polarization resistance among the electrochemical characteristics is sufficiently sensitive to in-service changes in long-term operated steels, which can serve as an informative parameter of the material degradation during cranes operation. The correlation between changes in impact strength and polarization resistance of portal steels, caused their operational degradation, is established. The electrochemical method was proposed to use for non-destructive diagnostics of steels technical state of marine portal cranes. The portable electrochemical cell adapted to determine the electrochemical properties of steels in the field conditions, according to which their resistance to brittle fracture can be predicted was developed.
Authors and Affiliations
Vitaliy Pustovoi, Ihor Reshchenko, Olga Zvirko
Keywords
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