Accelerated Low Water Corrosion (ALWC) is a particularly severe form of microbiologically-induced aggressive localised corrosion, which is most commonly found close to the level of the Lowest Astronomical Tide (LAT) on unprotected steel structures. As a method of controlling ALWC, the calcareous film produced on steel structures that are cathodically protected, has been studied as an inexpensive and environmentally-friendly corrosion control coating, with the intention being that the cathodic protection is applied only for so long as is necessary to develop a protective coating. When deposition are appropriately controlled, it could provide long-term corrosion protection for steel in seawater. In this work, calcareous deposits formed under impressed current cathodic protection (ICCP) using both DC and pulsed current in artificial seawater have been investigated.

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