Session: 02-05-01 Reliability of Marine Structures

Paper Number: 87375

87375 - Coating Degradation in Marine Atmospheric: Analysis of Real-Time Data Acquired From On-Site Sensors 

 The typical marine atmospheric corrosion tests are time-consuming and expensive. The alternative accelerated test methods performed in the laboratory are also controversial. Since 2000, with the advent and use of the sensors, their importance in the simultaneous study of corrosion in indoor and outdoor locations has received increasingly more attention. Sensors are able to simultaneously measure and record influences of the meteorological parameters on the corrosion current at even several minutes. Therefore, the generated real-time data via sensors have very rich information and should be analysed. In this study, the corrosion of low-alloyed carbon steel coated by an epoxy coating was studied in the marine atmosphere annually by a sensor for 2 successive years in a marine site with corrosivity of C5. The Impact of atmospheric parameters like (i) temperature, (ii) humidity, (iii) time of wetness, (iv) chloride concentration and (v) wind speed on corrosion current were then measured by analysis of the real-time sensor data. The results revealed that the chloride concentration combined with the humidity have the main influence on the corrosion current. Whereas temperature and humidity influences should be considered together. The accuracy of the time of wetness was then accordingly modified based on the temperature and humidity results.

Keywords; degradation, marine atmospheric corrosion, sensor, data analysis, modelling

Presenting Author: Bahman Daneshian Hereon

Authors:

Bahman Daneshian Hereon
Daniel Höche Institute of Surface Science Helmholtz-Zentrum Hereon
Ole Øystein Knudsen SINTEF Materials and Chemistry, Department of Applied Mechanics and Corrosion
Anders Werner Bredvei Skilbred Jotun Performance Coatings