Abstract
The research investigated the effect of silver nanoparticles on the corrosion behaviour of Mild steel and 316 Austenitic stainless steel in 0.5M H2SO4 using the potentiodynamic polarization method. The nanoparticles were synthesized from the sweet potato (Ipomoea batatas) plant extracts using Silver Nitrate (AgNO3) and were characterized using Atomic Adsorption Spectroscopy, Fourier Transform Infrared Spectroscopy and the Ultraviolet Visible Spectroscopy Technique. The AAS results showed that the plant extract is eco-friendly as it does not contain heavy metals. The FTIR results showed the different functional groups present in the extracts obtained from the different parts of the plant to be Alcohol O-H, Nitrile C≡N, Alkyne C≡C, Alkene C=C and Benzene Ring C=C. The UV-Vis results showed the presence of phenolic compound which aided inhibition. The results from the potentiodynamic polarization showed that the nanoparticle obtained from the leaf has the highest corrosion inhibition efficiency and the corrosion inhibition efficiency increases as the concentration of inhibitors increases.
Highlights
Carbon Steels are the most versatile material used in most industries since they account for over 90% of all segments of the energy sector, marine sector, transportation sector, chemical processing sector, petroleum production and refining sector and metal-production sector [1]
Recent researches, [10] - [12] demonstrated that silver nanoparticle-aided enhancement in the anti-corrosion potential and stability of plant extract as ecologically benign alternative for microbial induced corrosion treatment, the results revealed that AgNPs formed a protective layer of self-assembled film on the surface of MS1010 and reduced pit corrosion on the surface of MS1010
Elemental Constituents of the Extracts: The produced plant extracts were analysed with the Atomic Adsorption Spectroscopy (AAS) buck scientific 210 VGP to determine the metal elements present and their various concentrations in the solution
Summary
Carbon Steels are the most versatile material used in most industries since they account for over 90% of all segments of the energy sector, marine sector, transportation sector, chemical processing sector, petroleum production and refining sector and metal-production sector [1]. Austenitic stainless steels are the most common and familiar type of stainless steels and are extensively used both in domestic and industrial applications because of their strength, corrosion resistance, mechanical workability, and excellent electrical and thermal conductivities at high redhot and cryogenic temperatures. They are non-magnetic and cannot be hardened by heat treatment. Grade 316 austenitic stainless steel is alloyed with molybdenum; the molybdenum increases overall resistance to corrosion especially pitting corrosion from the chloride ion solutions, and enhances strength at considerably high temperatures [18]-[20]. This work investigates the corrosion behaviour of the mild steel and 316 Austenitic Stainless Steel in 0.5 M H2SO4 with 0.1 % and 0.3 % of silver nanoparticles as corrosion inhibitors
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