В работе проведён сравнительный анализ влияния ряда основных факторов, определяющих характеристики диэлектрических покрытий, как на коррозию подземных металлических трубопроводов, так и на их катодную защиту. При этом установлено, что в качестве приоритетного направления при разработке покрытий для пассивной защиты от коррозии трубопроводов в грунте (без использования катодной защиты) необходимо выбрать работу по снижению электропроводности покрытий в результате их насыщения почвенным электролитом. В свою очередь, в качестве приоритетного направления при разработке покрытий для комбинированной защиты трубопроводов в грунте необходимо выбрать работы по увеличению механической прочности покрытий и осуществление комплекса мероприятий как по предотвращению образования дефектов изоляции, так и по их устранению.
A comparative analysis of domestic and foreign documents governing the design of cathodic protection systems has been carried out. The main parameters for evaluating the effectiveness were selected: “protective current density”, “protective current value” and “indicators characterizing the degree of protection against corrosion in the presence of cathodic protection”. As a result, the need for improving the domestic system for designing cathodic protection installations was established. First of all, attention should be paid to the decrease in protective current, protective current density and criteria for determining the need for cathodic protection.
Paper provides comparative analysis of basic regulations governing design of systems of cathodic protection of underground metal structures against corrosion based on both Russian and international materials. The following basic parameters for evaluation of cathodic protection system performance are accepted: "need for applying cathodic protection systems", "values characterizing security of underground metal structures against corrosion in the presence of electrochemical protection", "density of protective current" and "magnitude of protective current". Carried out analysis identified the need to improve Russian system of cathodic protection systems design for all listed characteristics and above all in the direction of reducing the quantities of protective current and its density.
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