LIFETIME PREDICTIONS FOR CARBON STEEL IN NATURAL FRESH WATER

摘要

Corrosion rates of carbon steel in Duluth-Superior Harbor (DSH) were measured over a 3-year period using weight loss, pit depth measurements and linear polarization resistance (LPR). Corrosion coupons were placed in racks throughout the harbor and removed periodically for weight loss and pit depth measurements. LPR measurements were made at rack locations. Estimated corrosion rates varied among the techniques and there were no obvious relationships between predicted rates from the three techniques. Penetration rates estimated from pit depths were not linear with time. Pit depth varied among locations, but was consistently deepest during the first year of exposure.