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Gupta, Kapil Kumar
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2024CO2 corrosion resistance of low-alloy steel tempered at different temperaturescitations
- 2023Ex‐situ synchrotron X‐ray diffraction study of CO2 corrosion‐induced surface scales developed in low‐alloy steel with different initial microstructurecitations
- 2023Ex‐situ synchrotron X‐ray diffraction study of CO2 corrosion‐induced surface scales developed in low‐alloy steel with different initial microstructurecitations
- 2023The impact of minor Cr additions in low alloy steel on corrosion behavior in simulated well environmentcitations
- 2022Effect of Microstructure of Low-Alloy Steel on Corrosion Propagation in a Simulated CO2 Environmentcitations
- 2022On CO 2 corrosion resistance of low carbon steels in the formation water chemistry: The impact of Cr content as an alloying element
- 2022On CO2 corrosion resistance of low carbon steels in the formation water chemistry: The impact of Cr content as an alloying element
- 2022Investigation of Steel Alloy Chemistry, Microstructure, and Surface Finish on Oil field Corrosion and Scaling
- 2021Advanced complementary methods for characterization of the CO 2 -induced corrosion scale formation on steels: Synchrotron X-ray diffraction and X-ray computed tomography
- 2021Advanced complementary methods for characterization of the CO2-induced corrosion scale formation on steels: Synchrotron X-ray diffraction and X-ray computed tomography
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article
Effect of Microstructure of Low-Alloy Steel on Corrosion Propagation in a Simulated CO2 Environment
Abstract
<p>The paper focuses on the analysis of initiation and propagation of CO<sub>2</sub> corrosion in several samples of low-alloy steel with different microstructures using scanning electrochemical microscopy (SECM) and other microscopy techniques. It is found that the corrosion rate and the mode of corrosion are highly sensitive to the microstructure. The overall current density is much higher and more uniformly distributed for the tempered martensite structure than for samples having either a ferritic-pearlitic microstructure or a microstructure combining ferritic, bainitic and martensitic-austenitic regions. As a result, the sample with the tempered martensite structure undergoes uniform corrosion, while the other two samples undergo selective corrosion. The SECM maps show that regions of polygonal ferrite generate larger anodic currents than the pearlitic structure in the early stages of corrosion. The residual cementite provides greater cathodic surface areas after the initial dissolution of ferritic lamellae within pearlite, promoting galvanic corrosion and subsequently enhanced dissolution of ferritic lamellae. According to SECM data, the dissolution of iron in polygonal ferritic grains is 2.4 times faster than that of ferritic lamellae in pearlitic regions.</p>