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Abstract
Corrosion is clearly one of the more common causes of materials failure in stainless steel. To manage corrosion, chemical inhibitors are often used for prevention and control. Ionic liquids due to their hydrophobic and corrosion-resistant property are being explored as alternative protective coatings and anti-corrosion materials. In this particular study, ionic liquids containing functionalized imidazolium cations and tris(pentafluoroethyl)trifluorophosphate (FAP) anions were investigated for their ability to inhibit corrosion on stainless steel surfaces in acidic environment. Using surface characterization techniques, specifically scanning electron microscopy and energy-dispersive X-ray (EDX), the morphology and the elemental composition of the steel surfaces before and after corrosion were determined. Contact angle measurements were also performed to determine how these ionic liquids were able to wet the stainless steel surface. In addition, potentiodynamic studies were carried out to ensure that corrosion inhibition has occurred. Results show that these ionic liquids were able to inhibit corrosion on the stainless steel surfaces. This indicates promise in the use of these FAP-based ionic liquids for corrosion management in stainless steel.
Highlights
Stainless steel is widely used in various applications such as in construction, maritime transport and aerospace engineering [1,2].royalsocietypublishing.org/journal/rsos R
scanning electron microscopy (SEM) images of the ionic liquid-free or uncoated stainless steel substrates were acquired before acid exposure to ensure that initial microstructure deformation on the stainless steel surfaces, which can be mistaken for corrosion, are not present
Seventy-two hours were necessary to corrode the S30400 substrate using vapour coming from 50% formic acid, while 24 h was the needed exposure time for the S20200
Summary
Stainless steel is widely used in various applications such as in construction, maritime transport and aerospace engineering [1,2].royalsocietypublishing.org/journal/rsos R. Among the many types of stainless steel, the austenitic grade is noted for its increased corrosion resistance, good durability and relatively high tensile stress [4]. The nickel-containing types are classified as the 300 series, which are more formable and ductile compared to the manganese-containing ones, designated as the 200 series stainless steel [1,3]. These materials are known to be corrosion resistant, they may deteriorate when exposed to static stress and hostile environments, such as in acidic, alkaline and saline media [5,6,7]. The risk is even more pronounced in lubricated steel or steel contacts, and at high temperature and high pressure conditions common in industrial plants [7]
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