Abstract
AbstractMass losses have been measured for sacrificial anodes used for the cathodic protection of steel structures in tropical sea water off the coast of Singapore. By converting these mass losses to average current density values over the exposure time, information has been provided which may be used to predict the mass of sacrificial anodes needed to ensure adequate cathodic protection during the design life of steel structures in this environment. The average current density for cathodic protection of steel during the first day of exposure in Singapore sea water was found to lie in the range 711–2134 mA m−2, depending on the sea water current, anode type (zinc or aluminium), steel type (carbon content), and depth of exposure (2 or 12 m). The average current density fell with increasing time of exposure to 114·0, 58·0, and 19·1 mA m−2 for 2 months, 9 months, and 13 years exposure respectively. Equations expressing the average current density as a function of time for different depths in Singapore sea wa...
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