Innovative approaches to protecting pipelines from corrosion of the inner wall by alternating polarization method

Abstract

The article is devoted to an actual problem anti-corrosion protection of metal pipelines (main, technological, downhole columns, plumes). The disadvantages and advantages of the currently existing basic methods of protecting metals from corrosion are considered.
The issues of possible negative impact of cathodic protection on the inner wall of the pipeline during transportation of corrosive products are considered. Two schemes of cathodic protection of a pipeline without an internal electrolyte and a pipeline with an internal electrolyte are presented. In the schemes, the arrows indicate the distribution of the protective current Iprotect. from anode grounding in the pipe-to-ground circuit. It is shown in scheme 2 how the current is distributed along the conductor of the 1st kind a metal wall Iprotective metal. and along the conductor of the 2nd kind electrolyte Iprotective.elektr. which leads due to electrolysis to electrocorrosion of the inner wall of the metal pipeline in the electrolyte environment under the action of an external electric field.
The authors have proposed a method for protecting pipelines subject to corrosion of the inner and outer walls, to apply a method for simultaneous anticorrosive protection of the inner and outer surfaces of metal pipelines (RF Patent No. 2533467, 30.10.2012., Boyko S.I., Petrov A.V., A method for anticorrosive protection of the inner and outer surfaces of metal pipelines by applying alternating current).
The principle of operation of anti-corrosion protection by applying alternating current is described. The essence of the influence of weak alternating current on the kinetics of the corrosion process is briefly described. The main advantages of the method in comparison with traditional methods are given.