1. Can anyone offer observations on the effects of cathodic protection on well known corrosion of pipe as it emerges from soil or concrete (as in the case of pipes coming through basement wall) ? 2. Discuss insulation of salt water gathering lines.
The connection of concrete coated pipe with bituminous coated pipe can cause accelerated corrosion at the defects of the bituminous coating. The concrete coated pipe is cathodic to the exposed defects of the bituminous coated pipe. See corrosion, June, 1952, Page 212.
I have heard that alternating current superimposed on a magnesium galvanic anode may be rectified in such a manner as to reverse the direction of current flow between the anode and the pipe. Has anyone had any experience with this?
With reference to corrosion due to sulfate reducing bacteria or other organisms, are there specific measures applicable that would not be used against similar corrosion...
