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The latest research in the "Building and Building Materials" magazine outlines the self-healing properties of a new epoxy coating containing multi-walled carbon nanotubes (MWCNT) as nanocontainers, which can act as a powerful corrosion inhibitor.
Research: Self-healing epoxy resin coating with Elaesis guineensis/silver nanoparticles: a powerful corrosion inhibitor. Image Credit: Rost9/Shutterstock.com
These smart nano-containers can basically be used for low-carbon steel and other metals in unfavorable seawater environments.
According to the latest research, metal materials have a wide range of uses in various industries, including drilling, dams, casing, tubing, tanks, pumps, structures, valves, and bridges. Despite its excellent performance, metals often become thermodynamically unstable and corrode in a variety of harsh environments. The main corrosives include H2S, Cl-1, dissolved O2, SO42- and H2O.
Corrosion causes significant losses, especially in the civil engineering, mechanical engineering and structural engineering sectors. In order to prevent metal corrosion, many strategies are being explored. Metal forms, electroplating, galvanizing, corrosion protection, insulating films, and corrosion inhibitors are examples of these protection strategies.
The latest research shows that low-carbon steel plates are physically cut into (40 mm × 30 mm × 1 mm) pieces, peeled using emery pieces with a particle size of up to 1500, and then degreased with 70% acetone. To collect EG inhibitors, leaf extracts of Elaeis guineensis (palm tree) were harvested manually, washed under running fresh water, and dried in a dark area. The dried leaves are crushed into powder.
The MWCNTs container (purchased from Cheap Tubes, USA) has an outer diameter of 10-20 nm, a conductivity of less than 100 s/m, a surface area of 233 m2/g, a length of 10-30 m, and a density of 2.1 g/cm3.
The MWCNTs container is filled with EG/AgNPs corrosion inhibitor powder, which is dissolved in 200 mL (70% acetone, (RCI Labscan)) for 48 hours to form a saturated solution.
In order to check the electrochemical performance of ordinary and coated mild steel (MS) with blank coating and modified with MWCNTs-EG/AgNPs in brine, potentiodynamic polarization and EIS measurements were carried out.
The DC polarization experiment was carried out in the potential voltage range of 250 mV to 250 mV, and the open circuit potential was 0.5 mV/s.
In the new study, the AFM method (Nano-guide 3, JPK) was used to photograph the epoxy resin coating of the voids on the surface of low carbon steel (30 mm × 40 mm × 1 mm) and fill the smart nano container. The XRD pattern was obtained using the Rigaku SmartLab 3 kW frame to analyze the chemical properties of the surface reaction products of mild steel in the scraped area after being immersed in salt water for 42 days.
The adhesive strength of the blank epoxy resin adhesive and the coated mild steel (30 mm × 40 mm × 1 mm) filled with the smart nano container was measured using the American DeFelsko pull-out adhesion tester.
Metal corrosion. Image Credit: Quisquilia/Shutterstock.com
Before and after loading the green EG/AgNPs inhibitor, FESEM (model-Hitachi, SU8020) was used to study the surface morphology of MWCNT under 2 kV acceleration voltage.
MWCNTs and MWCNTs-EG/AgNPs have different diameters, and the green nanoparticle inhibitor mainly exists in the nanotubes themselves. This resulted in the tube diameter typically increasing from 12.7 nm to 42.7 nm, indicating that the inhibitor was effectively loaded into the carbon nanotubes.
In the presence and absence of 5% EG/AgNPs at 7, 21, and 42 days, the corrosion behavior of epoxy resin coated MS in seawater solution was examined by the EIS method. According to impedance spectroscopy, when EG/AgNPs inhibitors are present, the increase in the diameter of the semicircle is proportional to the exposure time of the mild steel.
The weight of smart nanocontainers (MWCNTs-EG/AgNPs) decreases with increasing temperature, showing three stages of weightlessness. The inhibitory effect of EG/AgNPs extract increased with the extension of the immersion time, reaching a maximum of 93.59% after being exposed to salt water for 42 days.
In view of this, it is obvious that the EG/AgNPs extract has a considerable inhibitory effect on the corrosion of mild steel in a salt water environment.
This means that the epoxy resin coating mainly prevents mild steel corrosion through the cathodic mode, while MWCNTs-EG/AgNPs improves the corrosion protection of the self-healing coating.
The reported corrosion reduction (improved corrosion resistance) is attributed to the effect of the repassivation process caused by the self-healing properties of the conversion coating. After 42 days of exposure, the blank coating increased the values of ba and bc to 1.180 V/dec and 5.680 V/dec, respectively, but the MWCNTs-EG/AgNPs coating decreased the values to 0.613 V/dec and 0.581 V/dec, respectively.
In short, the results show that the smart nanocontainer with epoxy resin exhibits a considerable reduction in the corrosion process. This not only ensures structural integrity, but also extends the service life of mechanical structures and saves millions of dollars.
Asaad, MA, Raja, PB, Huseien, GF, Fediuk, R., Ismail, M., & Alyousef, R. (2021). Self-healing epoxy resin coating doped with Elaesis guineensis/silver nanoparticles: a powerful corrosion inhibitor. Construction and building materials. -https://www.sciencedirect.com/science/article/pii/S0950061821031366
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Ibtisam graduated from the Islamabad Institute of Space Technology with a bachelor's degree in aerospace engineering. During his academic career, he participated in multiple research projects and successfully managed multiple extracurricular activities such as International World Space Week and International Aerospace Engineering Conference. Ibtisam participated in an English essay competition during his undergraduate course and has always been interested in research, writing and editing. Soon after graduation, he joined AzoNetwork as a freelancer to improve his skills. Ibtisam likes to travel, especially to the countryside. He has always been a sports fan and likes watching tennis, football and cricket. Ibtisam was born in Pakistan and one day hopes to travel the world, build strong bonds of friendship, and spread the message of peace and love.
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