Fundamental study on evaluation for time-dependent corrosion behavior of long steel members in marine environment

It is necessary to clarify time-dependent corrosion behavior of a steel member in marine environment in order to carry out the appropriate maintenace to corrosion damage. In this study, corroded surface of an angle specimen exposed for 19.5 years in marine enviorment were analyzed using regression tree to investigate the relationship between mean and maximum corrosion depth for corrosion regions with various characterisitics. In addition, variogram analyses were also carried out on the corroded surfaces to extract the spatial autocorrelation structures. Moreover, the corroded surfaces were numerically simulated using the autocorrelation structures. From these results, the evaluation method for the time-dependent corrosion depth of the long steel members was proposed.