Green synthesis of silver nanoparticles and their inhibitory efficacy on corrosion of carbon steel in hydrochloric acid solution
Saedah R. Al‐Mhyawi
Abstract
Silver nanoparticles were created by an easy green synthesis method using plant extract. The relationship between the size and form of silver nanoparticles and the concentration of silver nitrate salt was examined. Using plant extract (tobacco leaf extract) at concentrations of 3, 5, and 10 mill moles (mMol) of AgNO3, silver nanoparticles were produced. Using scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively, the form and structure of the prepared samples were analyzed. The relation between salt concentrations and the size of silver nanoparticles is depicted linearly in SEM images. The capacity of these nanomaterials to prevent the corrosion of carbon steel used in the petroleum industry when exposed to 1.0 N hydrochloric acid, a corrosive medium, is being investigated. Using chemical, electrochemical, and analytical techniques, the effect of concentration (50-200ppm) and temperature (303-333 K) on the ability of generated materials to inhibit growth was studied. It was revealed that the inhibitory efficacy decreased at higher temperatures and increased with higher doses. The maximum inhibition efficiency of 98% was achieved using 200 ppm of the nanomaterials 3. The inhibition is due to the Nano molecules’ adhesion and adsorption on the metal surface via Langmuir adsorption. There is a linear relationship between the size of nanoparticles and their inhibition efficiency, similar to the linear relationship observed between the size of silver nanoparticles and the salt concentration, as demonstrated by the order of inhibition efficiency for the three nanomaterial samples used: Nanomaterials Samples 3 > Nanomaterials Samples 2 > Nanomaterials Samples 1.