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- Title
Effect of Microstructure and Texture Evolution on the Electrochemical Corrosion Behavior of Warm-Rolled API 5L X70 Pipeline Steel.
- Authors
Ohaeri, Enyinnaya; Omale, Joseph; Eduok, Ubong; Szpunar, Jerzy; Arafin, Muhammad; Fazeli, Fateh
- Abstract
Thermomechanical treatments were used to improve the corrosion resistance of API 5L X70 pipeline steel materials. Successive warm rolling was performed at consistently reduced temperatures; 700 °C, 600 °C, and 500 °C. Steel plates comprised of different ferrite grain sizes were produced. However, the finest grain distribution was achieved at 700 °C rolling temperature. A combination of electron backscattered diffraction and X-ray diffraction (XRD) techniques were used to determine weak texture (i.e., preferred grain orientation) across all specimens. Grain orientation showed deviation toward the 〈111〉 direction at the surface of 700 °C rolled steel. After deformation at 600 °C, mostly 〈110〉 grains oriented parallel to the normal direction were obtained. Rolling at 500 °C resulted in random orientation of grains. Corrosion results show that anodic dissolution increased as the rolling temperature decreased in the order 700 °C > 600 °C > 500 °C for hydrogen-producing and non-hydrogen-producing test media. Also, molecular dynamics (MD) simulation confirmed that the adsorption energy of corrosive species interacting with the iron (Fe) surface increased in the order of Einteraction (111) < Einteraction (110) < Einteraction (100) for the two types of electrolytes. The relationships between the molecular species interacting in each corrosive media and selected crystal planes (i.e., (111), (110), and (100)) were established. X-ray photoelectron spectroscopy (XPS) confirmed that the adsorbed corrosion film on all tested steels are Fe2O3 (Fe2+) and hydrated ferric oxides such as FeOOH.
- Subjects
ELECTROLYTIC corrosion; MICROSTRUCTURE; X-ray photoelectron spectroscopy; FERRIC oxide; STEEL; PIPELINES
- Publication
Metallurgical & Materials Transactions. Part A, 2020, Vol 51, Issue 5, p2255
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-020-05659-7