PDP, EIS, and Surface Studies of the Low-Carbon Steel by the Extract of Tinospora cordifolia : A Green Approach to the C
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RESEARCH ARTICLE-CHEMISTRY
PDP, EIS, and Surface Studies of the Low-Carbon Steel by the Extract of Tinospora cordifolia: A Green Approach to the Corrosion Inhibition Akhil Saxena1 · Dwarika Prasad2 · Kamal Kishor Thakur1 · Jasdeep Kaur1 Received: 4 May 2020 / Accepted: 18 August 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract The influence of the Tinospora cordifolia extract on the low-carbon steel corrosion resistance in 0.5 M H2 SO4 medium was investigated by using weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy measurements coupled with surface analysis; scanning electron microscopy (SEM) and atomic force microscopy (AFM). Potentiodynamic polarization showed that the T. cordifolia extract acts as a mix-type inhibitor and 87.18% effectiveness was observed at 500 mg/L inhibitor concentration. This extract displays significant corrosion hindrance at particular concentrations. It is determined that the inhibition effectiveness boosts up with a rise in the concentration of the T. cordifolia extract. The adsorption nature of the T. cordifolia extract follows the Langmuir’s isotherm. Finally, the SEM and AFM analyses confirm the protection offered by the T. cordifolia extract on the steel surface in aggressive media. Keywords Tinospora cordifolia · EIS · XRD · Polarization measurements · AFM
1 Introduction For many years, the control of corrosion of metals is becoming an interesting field of research. As steel is commonly used alloy in industries and household purposes due to its easy availability and exceptionally good mechanical strength with minimal price. Despite the relatively important applications of low-carbon steel, its corrosion remains an important problem, especially in industries. In industries, the boilers and other equipment made from carbon steel are cleaned with acid solutions, but it creates corrosion to the metal surface [1]. Therefore, to protect the metal surface during cleansing with acid, there must be a mixing of some essential additives in acid solution. Numerous researchers have been discovered that imidazole derivatives, Gum Arabic, Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13369-020-04894-9) contains supplementary material, which is available to authorized users.
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Dwarika Prasad [email protected]
1
Division of Chemistry, Department of Applied Sciences, Chandigarh University, Mohali, India
2
Department of Chemistry, Shri Guru Ram Rai University, Dehradun 248001, India
of l-methionine amino acid, and other heterocyclic compounds are capable to reduce the corrosion procedure of the metal, but there are limitations of these derivatives because of their expensive synthesis and harmful impact on the atmosphere and mankind [2–8]. Such drawbacks of the synthetic inhibitors can be overcome with the utilization of natural products like fruits, bark, seeds, or some weeds and therapeutic plants as corrosion inhibitors, which have just been tried for their disease curing proper
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