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Mechanical, corrosion-mechanical and electrochemical parameters sensitive to corrosion-hydrogen degradation of structural steels under long - term in-service conditions

Nykryforchyn H.

Advances in Materials Science

2007

Vol. 7, nr 1(11)

176-183

Some low-alloyed steels exploited for decades of years in corrosion-hydrogen environments, namely, power steam pipeline, reactor shell of oil hydrocracking, oil trunk pipeline, are considered. The essential decrease of mechanical (impact strength, creep), corrosion (corrosion rate) and corrosion-mechanical (stress corrosion cracking) properties of exploited metal to compare with that in the virgin state is demonstrated. Especially high sensitivity of fracture mechanics characteristics (effective range of stress intensity factor of fatigue crack growth [detlaKth eff], fracture toughness Jlc) to in-service degradation is shown. It is revealed that same electrochemical parameters (polarization resistance, corrosion current) are especially sensitive to in-service degradation of steels at high and low temperatures as well. A correlation between changes of electrochemical and mechanical properties in the steel degradation process is drawn up.