Monitoring for relative effect of corrosive environmental factor on corrosion rate for steel structural details

It is necessary to examine the corrosion durability of a steel structure based on its local corrosive environmental conditions since its corrosion deterioration could appear locally, depending on the installation environment or structural details. In this study, therefore, test specimens with various structural details were fabricated to evaluate the relationship between the corrosive environmental factors and relative corrosion rates, and outdoor exposure tests were conducted on the distinguishing area with and without airborne chloride. For this, the temperature, relative humidity, corrosion current, time of wetness (TOW), and surface chloride were measured as corrosive environmental factors for the outdoor exposure test site and test specimens, and their relative corrosion rates were also examined using monitoring steel plates (MSP) as their mean corrosion depths. From the outdoor exposure test results, their mean corrosion depths exposed to the same environment were shown to be affected by their angles of the structural details. The relative mean corrosion depth varying due to the structural details was shown to be affected by the TOW and surface chloride. •Exposure tests to examine the corrosive environment factors using test specimens with various structural details.•Evaluation of corrosive environment factors and corrosion rate depending on structural details.•Analysis of relative effects of the local corrosive environment factors on the corrosion rate.