| Electrochemical studies of a base Schiff as a corrosion inhibitor for stainless steel in HCl 1.0 M |
| کد مقاله : 1075-CNF (R1) |
| نویسندگان |
|
شکوفه رضوانی نیا *1، علی بنویدی2 1دانشگاه یزد 2شیمی تجزیه، گروه شیمی، پردیس علوم پایه، دانشگاه یزد، یزد، ایران |
| چکیده مقاله |
| We live in a century where metal is one of the main materials available to humans and the use of metals in various industries and devices is increasing. Metals are naturally occurring in the form of ores and thermodynamically stable conditions along with other minerals. In order to use it, it must be extracted and, at the expense of extraction, construction and production costs, it must be turned into metal with the desired conditions. After extraction, the metal is thermodynamically unstable and returns to its stable state in the presence of suitable environmental conditions. This conversion from unstable to stable is called corrosion [1,2]. Today, corrosion has become one of the biggest problems in various industries. s. According to the National Association of Corrosion Engineers (NACE) in 2002, various nations including United States, Germany, Australia, Kuwait, Sweden, Japan, China and India loss around one to five percent of the total Gross National Product (GNP) because of corrosion. The purpose of this study is electrochemical study of inhibitors and coatings that are used to reduce the corrosion rate of metals in various industries [3,4]. Among the methods of preventing corrosion of metals, the use of corrosion inhibitors is the most effective and least expensive method [5]. Inhibitors include organic inhibitors and inorganic inhibitors. Inorganic inhibitors are very brittle and porous, which causes local corrosion of the metal surface, while organic compounds do not. Organic inhibitors often contain heteroatoms of sulfur, phosphorus, nitrogen, or oxygen, which effectively participate in adsorption centers. Organic inhibitors often contain heteroatoms of sulfur, phosphorus, nitrogen, or oxygen, which effectively participate in adsorption centers [6]. The present study investigates the adsorption and inhibitory effects of Schiff Base (2-[E)-2-phenylethenyl]benzene-1,4-diol) on 304 stainless steel (SS) in 1.0 M HCl solution. The corrosion study was performed by gravimetric, electrochemical impedance spectroscopy (EIS) and Tafel polarization curve. The corrosion current density for the electrode in the absence of inhibitor was 65.55 µA and with increasing the inhibitor to a concentration of 10-3 M, the corrosion current densitydecreased to 4.22µA. Charge transfer resistance in impedance diagrams confirms TOEFL curve results. Increasing the inhibitory concentration reduces the corrosion current density and the charge transfer resistance. The Langmuir isotherm model showed the best fit. |
| کلیدواژه ها |
| Coating, Corrosion, Electrochemical, Inhibitor, Metals |
| وضعیت: چکیده برای ارائه به صورت پوستر پذیرفته شده است |