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.

Subject
Pits, Corrosion rate, Predicted corrosion rate, Uniform corrosion rate, Pilings, Tubercles, Penetration, Weight loss, Weight loss analysis, Ports and harbors, Carbon steel, Corrosion coupons, Linear polarization resistance
Keywords:
carbon steel, pilings, freshwater, polarization resistance, weight loss, profilometry
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2011
GOV
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