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роботи використано під час розроблення СОУ 60.3-30019801-070,

ДСТУ Н Б А.3.1-29, зміни № 1 до ДСТУ 4219 за участі автора.

Ключові слова: магістральний газопровід, трубна сталь, захисні

покриви, корозійне розтріскування, комплексний протикорозійний захист,

катодний захист, метод деформації з малою швидкістю, потенціометрія,

фрактографія.

ABSTRACT

Nyrkova L.I. Theoretical and experimental principles of evaluation and

prevention of corrosion cracking of steels in main gas pipelines under the

conditions of their cathodic protection. – The manuscript.

Thesis for obtaining the scientific degree of the Doctor of Technical

Sciences on the specialty 05.17.14 – chemical resistance of materials and

protection against corrosion. – E. О. Paton Electric Welding Institute of the

National Academy of Sciences of Ukraine, G. V. Karpenko Physico-Mechanical

Institute of the National Academy of Sciences of Ukraine, Lviv, 2021.

In the dissertation work, a scientific and applied problem is solved – the

regularities of corrosion cracking of steel of main gas pipelines under their

cathodic protection are established, the solution of which expands the

understanding of the mechanism of stress corrosion cracking of main gas

pipelines, which makes it possible to scientifically substantiate approaches to the

choice of methods for its prevention.

The methodology of studies of susceptibility of pipe steel (on the example

of X70 steel) to corrosion cracking in the conditions of cathodic protection was

offered and scientifically grounded. The procedure consists in modeling the

factors present on a main gas pipeline during its operation in laboratory

conditions (contact with a corrosive environment, applied protective potential,

accumulated cycles of stress changes, simulating long-term operation of a

pipeline, presence of stress concentrator, protective coatings, etc.), studies and