ЗАКОНОМІРНОСТІ КОРОЗІЙНОГО РОЗТРІСКУВАННЯ ТРУБНОЇ СТАЛІ 10Г2ФБ У МОДЕЛЬНОМУ ГРУНТОВОМУ СЕРЕДОВИЩІ ЗА КАТОДНОЇ ПОЛЯРИЗАЦІЇ

Purpose. Investigate the regularities of corrosion cracking 10G2FB steel under cathodic protection.Methodology. The following methods were used: slow strain rate, scanning electron microscopy, electrolytic hydrogenation, mass measurement.Results. pipe in near neutral soil environment NS4 range potentials from potential to -1.2 V investigated. According results a complex corrosion-mechanical, electrochemical and physical studies, it was found that with shift polarization -0,75 ® -0,95 -1,05 -1,2 -0.95 coefficient susceptibility this stress KS increases correspondingly, 1,09 1,11 1,13 1,26. concentration hydrogen which penetrating into at these changes nonmonotonically: 0 0,057 0,018 mol/dm3. rate residual series Еcor decreases first sharply, then slowly: 0.035 mm/year 0.005 0.0009 0.0004 mm/year, i.e. high potentials, applied is spent on decomposition aqueous electrolyte release hydrogen, penetrates causes brittle cracking, confirmed by an increasing part fracture surface morphology specimens.Scientific originality. New fundamental research concerning stress-corrosion ferrite-pearlite class assortment conditions protection have been obtained. It revealed feature effect indicated when assessing tendency relative narrowing decrease elongation, generally indicates embrittlement metal contact corrosive medium potential. Strength characteristics remain almost same. greatest observed -1.0 or more negative.Practical value. developed methodology for study stress- used model simulating operating conditions. new data obtained will be useful preventing main gas pipelines during operation.