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CO2 CORROSION OF THE WELDED JOINT OF AN X65 STEEL: ANALYSIS OF SURFACE FILM FORMED
Abstract:
Corrosion is a critical concern in various industries, especially in the oil and gas sector, where steel pipelines are exposed to aggressive environments. Carbon dioxide (CO2) corrosion is a prevalent form of corrosion that can significantly impact the integrity and lifespan of steel structures. This study focuses on investigating the CO2 corrosion behavior of the welded joint of an X65 steel and analyzing the composition and characteristics of the surface film formed during corrosion.
The experimental investigation involved subjecting X65 steel specimens, specifically the welded joints, to a simulated CO2 corrosion environment under controlled conditions. Corrosion tests were conducted using a high-pressure autoclave system, which simulated the exposure of the welded joint to CO2-rich solutions at elevated temperatures and pressures. The test duration was extended to allow for the formation of a representative corrosion product film.
Surface analysis techniques, including scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD), were employed to examine the surface film formed on the corroded specimens. SEM provided high-resolution images of the surface, allowing for the observation of morphological features and corrosion product distribution. EDS analysis facilitated the identification and quantification of the elemental composition of the surface film. XRD analysis was used to determine the crystallographic phases present in the film.
The results revealed that the welded joint of X65 steel exhibited localized corrosion in the form of pitting. The surface film formed during CO2 corrosion was found to be predominantly composed of iron carbonate (FeCO3), iron oxide/hydroxide (FeO/Fe(OH)2), and other corrosion by-products. The composition and morphology of the surface film varied depending on the exposure time and environmental conditions.
Understanding the composition and characteristics of the surface film formed during CO2 corrosion is crucial for assessing the corrosion resistance and performance of welded joints in CO2-rich environments. The findings of this study contribute to the knowledge of CO2 corrosion mechanisms and provide valuable insights for the development of effective corrosion mitigation strategies for X65 steel in similar operating conditions.
CO2 CORROSION OF THE WELDED JOINT OF AN X65 STEEL: ANALYSIS OF SURFACE FILM FORMED. GET MORE MATERIALS SCIENCE AND ENGINEERING
