Abstract
The study on the action of Acetylcholine and Rivastigmine as Corrosion Inhibitors of Cu – Sn - Zn – Pb Alloy in Hydrochloric Acid Environment was carried out using density functional theory, electrochemical impedance spectroscopy, Potentiodynamic polarization, Scanning electron microscopy and weight loss. The result revealed that both Acetylcholine and Rivastigmine expired drugs were good inhibitors of Cu – Sn - Zn – Pb Alloy in Hydrochloric Acid Environment. This was confirmed from results of weight loss (99.1 % and 95.0 %), electrochemical impedance spectroscopy (EIS) (92.5 % and 91.8 %), and Potentiodynamic polarization (97.4 % and 87.1 %). Both inhibitors were able to increase the charge transfer resistance and corrosion current densities of the electrical solution and reduce the double layer capacitance of the metal – solution interface. Inhibition was as a result of adsorption of inhibitor molecules on the Cu – Sn - Zn – Pb surface. Thermodynamically, inhibitors showed greater stability on metal surface, spontaneous in the forward direction and reduction in level of disorderliness. Inhibitors demonstrated a mixed type inhibition while physical adsorption mechanism was proposed for the inhibitor – metal interaction. Langmuir adsorption isotherm was obeyed as data fitted adequately to the isotherm and regression coefficient was approximately unity. A monolayer adsorption was deduces.
Highlights
In order to transform a refined material into a chimerically stabled form which could be oxide, hydroxide, or sulfide, corrosion is always involved (Ammen 2000)
Corrosion can be influenced by factors like metals type, relative size of anode and environment (Ammen 2000; Dagdag et al, 2019)
Description of inhibitor used: A typical green inhibitor is that employed in this research (Figs. 1a – b), and their usage for this research boils down to the reasons stated earlier and not undermining the fact that there is limited work on these two in the area of corrosion science and their possible potency in corrosion inhibition as green inhibitors
Summary
In order to transform a refined material (in this case a metal) into a chimerically stabled form which could be oxide, hydroxide, or sulfide, corrosion is always involved (Ammen 2000). Corrosion is seen as the gradual destruction of materials by chemical and/or electrochemical reaction in an environment (Ammen 2000; Brady et al, 2002). The most frequently occurring type of corrosion is electrochemical corrosion in which the oxidation process M → M+ + e– is facilitated by the presence of a suitable electron acceptor, sometimes referred to as a depolarizer. Corrosion can be influenced by factors like metals type, relative size of anode and environment (temperature, humidity, salinity, etc.) (Ammen 2000; Dagdag et al, 2019). The aim of this research is to understand the possible inhibition strength of Acetylcholine and Rivastigmine expired drugs on Cu – Sn - Zn – Pb Alloy (Gun Metal) in Hydrochloric Acid Environment, their mechanism of adsorption and thermodynamic effects on the inhibitors
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Applied Sciences and Environmental Management
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
