Investigations were undertaken to evaluate the impact of hypoxia on corrosion within ballast tanks. Carbon steel coupons were exposed to seawater in alternating fill/drain conditions encountered in operational ballast tanks. The following alternating exposure conditions between fill/drain conditions were examined: 1) oxygenated seawater/air, 2) hypoxic seawater (0.2 mg/L O2)/hypoxic gas. The effect of oxygen on corrosion in a hypoxic environment was evaluated by introducing oxygenated air into the hypoxic chamber at the midpoint of the experiment. Differences in corrosion rate and morphology before and after the introduction of oxygen were quantified.

Subject
Ballast, Water, Corrosion rate, Steel coupons, Instantaneous corrosion rate, Natural seawater, Weight loss coupons, Seawater, Corrosion products, Weight loss, Oxygen, Carbon steel, Corrosion coupons
Keywords:
carbon steel, seawater, ballast, deoxygenation, alternate immersion, SRB, sulfide
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).
2006
GOV
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