فهرست نشریات علمی دسترسی آزاد ایران

Corrosion is a significant chemical and electrochemical process that leads to the degradation of metals through reactions with their environment- including air, moisture, acids, and salts. This occurrence represents a serious industrial and economic issue, causing significant financial losses annually and affecting the soundness of metal structures such as bridges, pipelines, and industrial equipment. In light of the critical need to mitigate corrosion damage, scientific research has prioritized the study of its underlying mechanisms and prevention strategies. Key advancements include the application of corrosion inhibitors, protective coatings, and nanomaterials, all of which have demonstrated significant efficacy in lowering corrosion rates and enhancing the longevity of metallic substrates. In this study, novel nanocomposites were synthesized, beginning with the preparation of 2,5-dimercapto-1,3,4-thiadiazole [1]. This precursor was obtained through the reaction of NH2NH2.H2O (0.01 mol, 99%) with carbon disulfide (0.02 mol). Subsequently, compound [1] was reacted with chloroacetic acid and anhydrous sodium carbonate in distilled water to yield 2,2’-((1,3,4-thiadiazole-2,5-diyl)bis(sulfanediyl))diacetic acid [2]. To prepare the corresponding acid chloride, compound [2] was treated with thionyl chloride in benzene to produce compound [3]. Finally, the O-chitosan derivative [4] was synthesized via the esterification of chitosan with compound [3] in an acidic aqueous medium, following the Fischer esterification method. O,N-carboxymethyl chitosan [5] was synthesized via the reaction of chitosan with compound [4] in a mixture of chloroform and pyridine. Subsequently, the modified chitosan derivatives [4, 5] were blended with carboxymethyl cellulose (CMC) to yield polymer blends [6, 7]. These blends were further incorporated with copper, silver, or zinc nanoparticles using a hotplate stirrer for three hours to produce nanocomposites [8–13]. The structural and morphological characteristics of the synthesized polymers and composites were characterized using (FTIR), (1H-NMR), Field Emission Scanning Electron Microscopy (FESEM), and Transmission Electron Microscopy (TEM). Testing the corrosion inhibition of modified CS, modified CS /CMC and nanocomposites on mild steel in 0.1M HCl was conducted by weight loss analysis and electrochemical measurements were used to explore the corrosion inhibition study. The results show that nanocomposites [11-13] have a higher inhibition rate than blended polymer [7], modified CS[5] against the corrosion of carbon steel.