Use of Sacrificial Anode for Corrosion Protection of Tradition Well Cover

摘要

The use of sacrificial anode for corrosion protection of a tradition well cover in Nigeria is the focus of this investigation. The unprotected unpainted and unprotected painted mild steel coupon samples served as control. Measurements were taken every five days for 90 days. The rate of zinc consumption during cathodic protection of the well cover was measured by the ‘loss in weight’ technique. The result shows that the synergetic effect of sacrificial anode protection and painting is highly more protective for mild steel well cover. The corrosion of the cathode (mild steel) decreased negatively and progressively from 0 (zero) mg.yr/mm2 to -8.9 x 10-2 mg.yr/mm2 after 90 days of exposure in well water. The rate of zinc consumption increases with decreasing level of cathodic protection by sacrificial anode with increasing time. The rate of zinc consumption during cathodic protection of protected unpainted and protected painted steel coupon ranged from zero (0) to 6.77 x 10-2 mg.yr./mm2 and from zero (0) to 3.28 x 10-2 mg.yr./mm2 respectively.