Stress Corrosion Behavior of X80 Steel Under Alternating Wet and Dry Cathodic Potential
Stress corrosion cracking(SCC)mechanism of X80 steel under different cathodic potentials in alternating wet and dry marine environment is investigated by electrochemical test and slow strain rate tensile test.The results show that the cathodic potential of-850 mV reduces the corrosion current density of steel,and the corrosion current density increases with the decrease of applied potential.The effect of cathodic protection gradually decreases due to strain.Compared with no applied potential,the SCCsusceptibility of steel at-850 mV potential is reduced by 14.28％,while the susceptibility at-1 200 mV potential is increased by 71.42％,the specimens change from ductile fracture to brittle fracture.The protection effect of the applied potential is achieved by inhibiting the anodic dissolution of the steel.With the decrease of the potential,severe hydrogen evolution reaction is triggered,resulting in higher SCCsusceptibility.
stress corrosionX80steelcathode potentialalternatewet and dry
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