Inhibition of mild steel corrosion in CO2 and H2S‐saturated acidic media by a new polyurea‐based material

Oil well acidizing is a common practice used to boost oil well productivity in the industry. This practice, however, exposes the mild steel components of the wells to extremely harsh corrosive environments. Under such conditions, highly efficient inhibitors are used to minimize corrosion attack. In...

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Bibliographic Details
Published in:Materials and corrosion 2020-04, Vol.71 (4), p.646-662
Main Authors: Abdulazeez, Ismail, Al‐Hamouz, Othman Charles S., Khaled, Mazen, Al‐Saadi, Abdulaziz A.
Format: Article
Language:English
Subjects:
adsorption
Carbon dioxide
Chemisorption
Corrosion
Corrosion currents
corrosion inhibitor
Corrosion inhibitors
Corrosion potential
Corrosion tests
density‐functional theory
Hydrogen sulfide
Low carbon steels
mild steel
Oil wells
polyurea
Quantum chemistry
Surface properties
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Summary:Oil well acidizing is a common practice used to boost oil well productivity in the industry. This practice, however, exposes the mild steel components of the wells to extremely harsh corrosive environments. Under such conditions, highly efficient inhibitors are used to minimize corrosion attack. In the present study, corrosion inhibition of mild steel in simulated acidic medium saturated with CO2 and H2S gases by a newly synthesized polyurea‐based material (PUCorr‐1) was investigated. Electrochemical studies supported with quantum chemical density‐functional theory calculations and surface characterization revealed that PUCorr‐1 adsorbs onto mild steel through a chemisorption mechanism yielding a stable protective film. The polyurea exhibited an excellent efficiency of 99.9% at a temperature of 50°C and a low concentration of 100 ppm, yielding a corrosion current density of 0.3 µA/cm2. In the presence of CO2 and H2S gases, PuCorr‐1 exhibited a remarkable performance (>93% efficiency) making it a potential corrosion inhibitor in industrial processes that involve the use of acid solutions in the presence of CO2 and H2S gases. A new polyurea‐based material (PUCorr‐1) for corrosion protection of mild steel in acidic medium was successfully synthesized. Electrochemical corrosion measurements supported with density‐functional theory calculations revealed that PUCorr‐1 adsorbs onto mild steel through a chemisorption process forming a stable protective film. Corrosion resistance of mild steel in the presence of the polymer increases with increasing temperature
ISSN:0947-5117
1521-4176
DOI:10.1002/maco.201911270