Influence of plasticity on corrosion and stress corrosion cracking behaviour in near neutral pH environment

Abstract

This study focused on the effect of plasticity on stress corrosion cracking of pipeline steel (X-52) in near neutral pH environment. A simulated near neutral pH soil solution, referred to as C-1, was used for all the tests. The effects of plastic deformation on both corrosion current and open circuit potential were studied. Crack advance was measured in samples with various amounts of plastic deformation by slow strain rate tests and corrosion fatigue tests using potential drop to measure crack advance. Crack morphologies and the crack features on the fracture surface were observed by SEM. All the cracking tests indicated that the stress corrosion cracking rate was enhanced by the plastic deformation. The electrochemical tests showed that corrosion current increased with increasing plastic deformation. The relationship between the cracking mechanisms and prior plastic deformation are discussed.

Keywords

NEAR NEUTRAL PH SCC PIPELINE STEEL CRACK GROWTH RATE

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