Silver nanoparticles - Expired medicinal drugs waste accumulated at hail city for the local manufacturing of green corrosion inhibitor system for steel in acidic environment

The aim of the present study is to avoid the accumulation of expired drugs and chemicals in Hail City Saudi Arabia by using it for the manufacturing of eco-friendly corrosion inhibitors as a local product for the Hail area. The current study looks at Ag nanoparticles' green synthesis, characterization, and inhibitory properties. Silver nitrate (AgNO3) was used as a precursor, sodium citrate as a reducing agent, and polyvinyl alcohol (PVA) as a stabilizer in the chemical reduction procedure. The effect of adding expired Baclofen drug (EMBD) collected from the Hail area to the nanoparticles was investigated. The addition of PVA and expired pharmaceuticals to the nanoparticles increased the corrosion inhibition of steel. The researchers looked at the effects of nanoparticle concentrations, reaction temperature, and mixing nanomaterials with medications. With rising nanoparticle concentrations, expired drug concentrations, and reaction temperature, corrosion inhibition was observed to rise. The inhibition is caused by nanoparticle adsorption on steel surfaces that follow the Langmuir Isotherm. The addition of EMBD to nanomaterials improved their inhibitory performance, which was found to be (Nano2- EMBD) > (Nano1- EMBD) > (Nano2) > (Nano1) > (EMBD), in that order. Nanomaterials are promoted by the expiring medication meaning that, the synergistic effect happens between nanomaterials and drug systems. The results of potentiodynamic polarization as electrochemical measurements show that the inhibitor system (Nano2- EMBD) acts as a mixed-type. Electrochemical impedance spectroscopy (EIS) data show that the inhibitor system improves polarization resistance and inhibition performance by adhering to the metal/electrolyte interface.