Abstract
Recently, the cathodic protection which is one of the corrosion protection methods has generally been applied to iron and steel installations, however there have been few applications to pumps.
Cathodic protection of a centrifugal pump for sea water by zinc anodes has been investigated.
The results obtained are as follows.
(1) The corrosion of centrifugal pump is prevented completely by the cathodic protection by selecting suitable numbers and positions of zinc anodes.
(2) The necessary current for achieving complete protection is 500-600mA per square meter of steel surface. This current density is about four times of the value which is generally accepted for protecting steel in moving sea water.
