Influence of external tensile stress on corrosion and trench formation of low alloy steel in a low H<sub>2</sub>S content sour corrosion environment
Itaru Samusawa, Daichi Izumi, Junji Shimamura
Abstract
Abstract The influence of external tensile stress on corrosion and trench formation of low alloy steel in a low H 2 S content sour corrosion environment was investigated. These experiments were conducted with steel for pipelines, and electrochemical methods were used. The results showed that external stress increases the amount of corrosion weight loss and trench depth by promoting the anodic dissolution reaction, and stress concentration was proven to be one of the driving forces for trench formation due to localized corrosion. Based on the experimental findings, the mechanism of trenching was discussed from the viewpoint of promotion of the anodic dissolution reaction by dislocations.
Topics & Concepts
TrenchCorrosionMaterials scienceMetallurgyAlloyDissolutionStress (linguistics)ElectrochemistryUltimate tensile strengthAnodePitting corrosionComposite materialElectrodeChemistryChemical engineeringEngineeringPhysical chemistryLinguisticsLayer (electronics)PhilosophyHydrogen embrittlement and corrosion behaviors in metalsCorrosion Behavior and InhibitionConcrete Corrosion and Durability