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Data from a variety of field exposure programs is used to quantify the effect of concentration of dissolved inorganic nitrogen (DIN) on long-term seawater immersion corrosion loss of structural steels. A linear correlation model that asymptotes the long-term part of the previously proposed bimodal corrosion loss model is used. It allows for average seawater temperature. Model parameters and their variability are determined and reported. The model permits prediction of long-term corrosion loss in nutrient polluted waters of known average temperature. An example shows that anthropological pollution of seawater potentially is a major hazard for corrosion of steel infrastructure.

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The cause of the high corrosion losses below the low tide level on older steel piling (usually called Accelerated Low Water Corrosion -ALWC) is incompletely understood but usually linked to microbiological influences. Vertical 3-6 m long steel strips were exposed through the tidal zone at 13 different marine sites. After only 1-3 years good correlation was found between ALWC and local seawater average concentration of dissolved inorganic nitrogen, a necessary nutrient for microbiological activity. These results allow prediction of the likelihood of long-term ALWC through measurement of either short-term corrosion loss profiles or average nutrient levels.