Abstract
Our study aims to implement a strategy to reduce the carbon steel corrosion rate in a sulfuric acid solution, using an expired drug with adsorption affinity on the metal surface. To investigate the corrosion protection efficiency of an environmental friendly inhibitor, namely neomycin sulfate (NMS), the electrochemical measurements were applied on carbon steel immersed in 1.0 M H2SO4 solution with and without NMS. The protective layer that formed on the steel surface was studied by atomic force microscopy (AFM). The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) showed that the presence of the neomycin sulfate in acid solution leads to the decrease in corrosion current density (icorr) and the increase of polarization resistance (Rp). The mixed mechanism between physical and chemical adsorption of NMS molecules on the steel surface was proposed according to the Langmuir adsorption isotherm. AFM indicated that the NMS molecules contributed to a protective layer formation by their adsorption on the steel surface. The AFM parameters, such as root mean square roughness (Rq), average roughness (Ra), and maximum peak to valley height (Rp−v) revealed that in the presence of NMS a smoother surface of carbon steel was obtained, compared to the steel surface corroded in sulfuric acid blank solution.
Highlights
The different types of steel are widely utilized in many industrial fields due to their specific characteristics and properties
Fouda et al [18] have studied the behavior of the neomycin sulfate as corrosion inhibitor for carbon steel in 1.0 M HCl solution using chemical and electrochemical measurements, yielding from electrochemical impedance spectroscopy (EIS), an inhibition efficiency value of 81.7%, the inhibitor concentration being of 15 × 10−6 M
Neomycin sulfate was investigated as an inhibitor for carbon steel corrosion in 1.0 M H2 SO4 solution, using potentiodynamic polarization and electrochemical impedance spectroscopy associated with Atomic Force Microscopy (AFM)
Summary
The different types of steel are widely utilized in many industrial fields due to their specific characteristics and properties. Fouda et al [18] have studied the behavior of the neomycin sulfate as corrosion inhibitor for carbon steel in 1.0 M HCl solution using chemical and electrochemical measurements, yielding from EIS, an inhibition efficiency value of 81.7%, the inhibitor concentration being of 15 × 10−6 M. They conclude that the neomycin acted by adsorption, mainly due to electrostatic interactions between the inhibitor molecules and the steel surface. The changes appeared in the surface morphology, and the protective layer characteristics formed by adsorption of NMS molecules were studied by atomic force microscopy (AFM)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
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 call
