Atmospheric Corrosion Modeling and Corrosivity Categorization of 1008 Carbon Steel in Alaska

A comprehensive understanding of atmospheric corrosion guides informed design choices and effective anti-corrosion protection strategies. Despite advancements in the understanding of atmospheric corrosion, there exists a knowledge gap in the corrosivity of metals in subarctic regions like Alaska where evaluation is made more difficult. Multi-angle corrosion test racks were deployed at four test sites in Alaska each equipped with weather sensors and chloride candles to evaluate atmospheric and environmental severity. Recorded weather parameters include air temperature, relative humidity, time of wetness, total rainfall, and aerosol chloride and sulfate deposition. 1008 Carbon Steel was chosen for exposure and analysis. Post-exposure coupon mass loss was measured, and corrosion rates were analyzed as a function of exposure angle. Based on experimental results, equations were developed to more accurately model and estimate the corrosive behavior and evaluate the atmospheric corrosivity in Alaska. This model quantifies experimental corrosion rates as a function of air temperature, relative humidity, sulfate deposition, chloride deposition, percent time wet, and exposure duration.