Nanometer scaled materials have attracted tremendous interest as corrosion protective films due to their high ability to form self-assembled films on the metal surfaces. It is well known that the silver nanoparticles have higher reactivity towards aqueous acidic solution. The present work aims to prepare coated silver nanoparticles to protect carbon steel alloys from aqueous acidic corrosive media. In this respect, Ag nanoparticles colloid solutions were produced through reducing AgNO3 separately with trisodium citrate in an aqueous solution or in the presence of stabilizer such as poly(ethylene glycol) thiol and poly(vinyl pyrrolidone). The morphology of the modified silver nanoparticles was investigated by TEM and DLS. UV-Vis absorption spectrum was used to study the effect of HCl on the stability of the dispersed silver nanoparticles. The corrosion inhibition efficiency of the poly (ethylene glycol)thiol, the self-assembled monolayers of Ag nanoparticles, was determined by polarization method and electrochemical impedance spectroscopy (EIS). Polarization curves indicated that the coated silver poly (ethylene glycol)thiol acted as a mixed type inhibitor. The data of inhibition efficiencies obtained measured by polarization measurements are in good agreement with those obtained with electrochemical impedance. 1. Introduction Due to its particular properties (excellent thermal and electrical conductivity, malleability, ductility, etc.), iron is widely used in industrial production and many other areas which make it very important to research corrosion and protection of iron and its alloy. The high anticorrosion materials for iron are called self-assembled materials (SAMs). The stable SAMs [1] form can prevent corrosive ions from transferring to the metal surface and can protect the metal from corrosion effectively [2, 3]. There are a lot of materials that have been used to make SAMs as corrosion inhibitors on the copper and iron [4–6]. Shimura and Aramaki [7–9] succeeded to protect iron from corrosion by covering it with ultrathin films. Feng and coworkers investigated self-assembly technique to enhance the iron resistance against environmental corrosion [10, 11]. In the past few years, many efforts have been focused on the fabrication of Ag nanoparticles due to their unique chemical and physical properties [12]. At present, there are many techniques available for the synthesis of metal nanoparticles, which includes gas reduction process [13], precursor pyrolysis [14], microwave plasma synthesis, hydrodynamic cavitations and liquid chemical reduction
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