ADVANCES IN THE CATHODIC PROTECTION OFUNDERGROUND WATER WELLS

摘要

The poll of a water captation stops to prevent it from being ruined, is protected by a steel pipe up to thernof the perforation. Later in his interior one introduces the pump, the filter elements, etc., all of the metallicrnelements to be protected. The corrosion can start acting soon, so much on the outside like for the interior ofrnthe pipe up to where the level of the water comes. In the processes of corrosion that can spoil the metallicrnelements, there could actuate galvanic processes, differentially air, bacteria, erratic currents, etc. Thisrncorrosion is destroying the metal and the products that he generates can obstruct the filter elements or thosernof water aspiration, accelerating his aging. Considering the traditional idea of the cathodic protection, tornprotect all the pipe it would be necessary to think of projecting a cathodic protection, to protect all the pipernit would be necessary to think of projecting a cathodic protection for the exterior of the pipe and other onernfor his interior. In the current wells, the cathodic protection in the interior is practically impossible to leadrnher to effect, for the great quantity of elements that are lodged inside the pipe, which they make impossiblernintroduce nothing more.rnIn laboratory test programs there could have been verified that an impress current cathodic protectionrnapplied on the outside of the pipe protects also the interior. To identical results it has come near in real tests,rnwhich appear in this work.