Cathodic Protection in Cold Seawater – Current Density Requirement

Cathodic protection combined with organic coating is the normal way to protect structures exposed to seawater against corrosion.  The oil and gas industry is moving to deeper waters with pipelines and production systems located on the sea bottom often far way from shore.  Seawater temperature down to or below 0⁰C is occurring at these deep waters.  This paper presents results from carbon steel specimens polarized in the range -800 - -1100 mV SCE in natural seawater at temperature 0⁰C.  Current density values will be presented.  In addition the composition of calcareous deposit on the surface will be described.