Electrochemical investigation into the dynamic mechanism of CO2 corrosion product film formation on the carbon steel under the water-condensation condition

2021 ◽  
pp. 138880
Author(s):  
Md Mayeedul Islam ◽  
Thunyaluk Pojtanabuntoeng ◽  
Rolf Gubner ◽  
Brian Kinsella
Keyword(s):  
Carbon Steel ◽  
Corrosion Product ◽  
Film Formation ◽  
Dynamic Mechanism ◽  
Co2 Corrosion ◽  
Electrochemical Investigation ◽  
Corrosion Product Film ◽  
Water Condensation ◽  
Product Film ◽  
Condensation Condition

scholarly journals CO2 corrosion prediction of 20# steel under the influence of corrosion product film

Petroleum ◽  
2021 ◽  
Author(s):  
Yingxue Liu ◽  
Hongye Jiang ◽  
Taolong Xu ◽  
Youlv Li
Keyword(s):  
Corrosion Product ◽  
Co2 Corrosion ◽  
Corrosion Product Film ◽  
Product Film

Errosion-Corrosion Critical Performance of Surface Nanocrystalline 20 Carbon Steel in Condensate Water

2011 ◽  
Vol 189-193 ◽  
pp. 958-964 ◽  
Author(s):  
Xiao Lei Zhu ◽  
Xiao Feng Lu ◽  
Xiang Ling
Keyword(s):  
Carbon Steel ◽  
Impact Strength ◽  
Corrosion Product ◽  
Critical Velocity ◽  
Anodic Process ◽  
Test Surface ◽  
Surface Nanocrystallization ◽  
Corrosion Product Film ◽  
Product Film ◽  
The Impact

In this paper, the ultrasonic shot peening (USSP) technology was used to obtained surface nanocrystalline of 20 carbon steel. The grain size of test surface and the thickness of nanocrystallization layer were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The three electrode electrochemical measurement was employed to investigate the electrochemical corrosion performance and the critical character of USSP surface nanocrystallization samples in different impact strength. The results showed that the USSP surface nanocrystallization could obtain the nanocrystalline grain. The thickness of nanocrystallization layer increased and grain sizes reduced with the increase of the impact strength. Nanocrystallization layer took the way to expand concentric circles with impact crater as the center. The corrosion current of nanocrystallization sample was much larger than as-received. The controlled step of corrosion process was turned from cathodic process to anodic process by USSP surface nanocrystallization. The sample surface formed two layers corrosion product films in condensate water, which were compact Fe3O4membrane as inner corrosion product film and loose Fe3O4membrane or Fe2O3membrane as outer layer. With the increase of the impact strength, critical velocity of the outer corrosion product film increased gradually. The critical velocity of inner corrosion product film had an increasing trend, but the critical velocity tended to be a constant value when impact strength was more than 1.9904min/cm2

scholarly journals The Formation of Sulfide Scales on Carbon Steel in Saturated H2S

2020 ◽  
Author(s):  
Noora Alqahtani ◽  
Jiahui Qi ◽  
Aboubakr M. Abdullah ◽  
Nicholas J. Laycock ◽  
Mary P. Ryan
Keyword(s):  
Carbon Steel ◽  
Corrosion Product ◽  
Film Formation ◽  
Open Circuit ◽  
Iron Surface ◽  
Ion Concentration ◽  
Bulk Solution ◽  
Formation Mechanisms ◽  
Structure Thickness ◽  
Circuit Technique

There are three contributing elements of corrosion of Carbon Steel in H₂ S environment: the effect of H2S on water chemistry; electrochemical reactions of the bare iron surface (both anodic and cathodic processes); and the formation and growth of corrosion product layers. The electrochemical reaction commonly contains three stages: first, the reactant transported from the solution (bulk) to the metal surface; then the transfer of the charge reaction on the surface, followed by the reaction product transported away from the iron surface to the bulk solution or the formation and development of the corrosion product which then can decrease the corrosion rate. Development of a robust corrosion model to predict the corrosion process in H2S requires a mechanistic understanding of all these elements. An experimental study was carried out to assess the corrosion of C-steel under open-circuit technique conditions and in solutions at several ranges of time and temperatures. The effect of film composition, morphology, structure, thickness, and ion- concentration of corrosion product films formed on pipeline Carbon Steel in an acid sour solution were examined. The electrochemical behavior of the filmed steel was measured, and the film properties assessed using a range of advanced techniques including Scanning Electron Microscopy (SEM), and Raman spectroscopy (RS). The data will be discussed in terms of film formation mechanisms.

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