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експлуатаційної деградації сталей металоконструкцій за їх схильністю до

розшарування використано у ТОВ Фірма “Діалаб” ЛТД для обґрунтування їх

наднормативної експлуатації.

Ключові слова: сталь, корозія, електрохімічні властивості, інігібітор,

наводнювання, корозійно-механічне руйнування, корозійна втома,

експлуатація.

ABSTRACT

Kret N. V. Peculiarities of corrosion-hydrogen degradation of ferrite-pearlite

steels of the objects of hydrocarbons exploration and transportation. – Qualification

scientific work as the manuscript.

Thesis for the Candidate’s degree in engineering sciences by speciality

05.17.14 – Сhemical resistance of materials and corrosion protection. – Karpenko

Physico-Mechanical Institute of the National Academy of Sciences of Ukraine,

Lviv, 2021.

An actual scientific and technical task has been resolved in this work devoted

to establishment of the main regularities of corrosion-hydrogen degradation of

ferritic-pearlitic steels taking into account chemical composition of model formation

waters and type of operational loading and development of the method for

increasing their corrosion resistance and resistance to corrosion-mechanical fracture

by means of environmentally friendly inhibitor.

The influence of microstructure features of steels of casing pipes with

different strength on their corrosion resistance, brittle fracture resistance,

susceptibility to hydrogen embrittlement has been analysed. It has been established

that the initial stage of corrosion of the ferritic-pearlitic 50Г and 32Г2 steels of

casing pipes in an acid chloride solution with pH = 3.1, modelling formation water,

consists in the predominant dissolution of structural-free ferrite, the fraction of

which in the steel microstructure is the dominant factor of corrosion intensification.
The low-strength 50Г steel of casing pipe with coarse-grained ferritic-pearlitic

microstructure is characterized by 1.5 times lower corrosion resistance in model