Electrochemical corrosion behavior of X80 pipeline steel in a near‐neutral pH solution

Abstract

In this work, the electrochemical corrosion behavior of X80 pipeline steel was investigated in a near-neutral pH solution using electrochemical impedance spectroscopy (EIC) and photo-electrochemical (PEC) measurements as well as X-ray photo-electron spectroscopy (XPS) technique. The effects of hydrogencharging and stress were considered. The results show that the steel is in an active dissolution state, and a layer of corrosion product is formed and deposited on the electrode surface, which is subjected to further oxidation to form ferric oxide and hydroxide. Photo-illumination enhances anodic dissolution of the steel when it is under anodic polarization due to destroying of the corrosion product film. When the steel is under cathodic polarization, the cathodic current density decreases upon laser illumination due to the photo-oxidation of hydrogen atoms generated during cathodic reactions, which behaves as an anodic reaction to offset the cathodic current density. Hydrogen-charging and stress decrease the corrosion resistance of the steel and enhance the dissolution rate of the steel.

Effect of Plastic Strain on the Electrochemical Behavior of Lean Duplex Uns S32304 Stainless Steel

“…The impact of prior deformation on oxidation rates but also on hydrogen evolution, which may cause embrittlement, has been addressed on different materials. Y. Cheng and co-workers [6][7][8][9][10][11] have concluded that strain would promote corrosion specially in the plastic region on high-strength steels [11]. That is in agreement with the mechanoelectrochemical interactions theory, which takes into account the activation of new dislocations in the material.…”

Modeling of the corrosion process in steel oil pipelines in order to improve environmental safety

“…Numerical studies on the behavior of steel at electrochemical corrosion are described in papers [3,[18][19][20][21], but the research did not take into account the impact of local corrosion damage and operating conditions. Thus, even after numerous studies, the need to develop new dependences for assessing the corrosion processes that would take into account local environmental impacts, as well as special features in the operation of oil pipelines, remains largely unresolved.…”

Theoretical and Experimental Aspects of the Corrosivity of Simulated Soil Solutions

“…The majority of papers deal with the presence of carbon dioxide frequently produced by decaying organic matter present in soil. Indeed, this environment is prone to promote corrosion process [7] but some embrittlement was also detected for pipeline steel X65 in slow strain rate test without bubbling carbon dioxide [2].…”

“…Then, the simulated ones are used mainly due to their reproducibility in laboratory [1]. We can cite several synthetic solutions [2][3][4] proposed to meet this requirement. These synthetic solutions frequently provoke stress corrosion cracking and are widespread used to evaluate cracking susceptibility of pipeline steels.…”