تاثیر سدیم مولیبدات بر عملکرد ممانعت کنندگی بنزوتری آزول بر خوردگی مس در آب دریای شبیه سازی شده

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی متالورژی و مواد، پردیس فنی، دانشگاه تهران، ایران

2 دانشگاه تهران-پردیس فنی-دانشکده مهندسی متالورژی و مواد

چکیده

سیستم‌های خنک‌کننده در نیروگاه‌ها، بخش‌های تولیدی و پالایشگاه‌ها برای کاهش گرمای سیستم‌ها و افزایش راندمان کاری به‌صورت گسترده مورد استفاده قرار می‌گیرند. مس به‌علت هدایت حرارتی بالا کاربرد گسترده‌ای در سیستم‌های خنک کننده دارد. خوردگی مس یکی از مشکلات اصلی این صنایع است. استفاده از بازدارنده‌های خوردگی یکی از روش‌های متداول برای کنترل خوردگی در سیستم‌های خنک‌کننده است. به منظور حفاظت از فلزات مختلف در سیستم‌های خنک کننده بازدارنده‌های مختلفی مورد استفاده قرار می‌گیرد. اثر هم افزایی یا رقابتی بازدارنده‌ها بر یکدیگر ممکن است راندمان یازدارندگی را تحت تاثیر قرار دهد. عملکرد ممانعت کنندگی بنزوتری آزول (BTA) بر خوردگی مس در آب دریا در حضور و عدم حضور سدیم مولیبدات (SM) به کمک آزمایش‌های غوطه‌وری، پلاریزاسیون و امپدانس الکتروشیمیایی مورد بررسی قرار گرفت. نتایج نشان داد جذب ممانعت‌ کننده‌های BTA و SM به سطح مس از ایزوترم جذب لانگمیر پیروی می‌کند. مقدار انرژی جذب ممانعت‌کننده‌های BTA و SM به سطح مس به‌ترتیب برابر 88/33- و kJ/mol 22/21- به‌دست آمد. سدیم مولیبدات با جذب سطحی باعث پایداری اکسیدهای سطح مس می‌شود که به نوبه خود اثر هم افزایی بر عملکرد ممانعت کنندگی بنزوتری آزول دارد. عملکرد ممانعت کنندگی سدیم مولیبدات و بنزوتری آزول به‌ترتیب به پایدار کردن اکسید سطحی مس و تشکیل کمپلکس محافظ سطحی نسبت داده شد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Sodium Molybdate on Corrosion Inhibition of 1H-Benzotriale for Copper in Simulated Sea Water

نویسندگان [English]

  • Kazem Sabet Bokati 1
  • Changiz Dehghanian 2
1 School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Iran
2 School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Iran
چکیده [English]

The cooling systems are widely used in power plants, manufacturing industries and refineries for the sake of reducing system heats and an increase in operational efficiency. Copper is widely used in cooling systems due to its high thermal conductivity. Corrosion of copper is one of main problems in these industries. The use of corrosion inhibitors is a common method to control the corrosion in cooling systems. Various inhibitors are usually used to protect the different metals in cooling systems. The synergistic or antagonistic effect of inhibitors on each other may be influenced on inhibition efficiency. The inhibition effect of 1H-benzotriazole (BTA) on corrosion of copper has been investigated in simulated sea water in the presence and absence of sodium molybdate (SM) using weight loss, Tafel polarization and electrochemical impedance spectrometry (EIS) methods. The results indicated that adsorption of BTA and SM on copper surface obeyed from Langmuir adsorption isotherm. The adsorption energy values for BTA and SM on copper surface was obtained -33.88 and -21.22 kJ/mol, respectively. The absorption of sodium molybdate promoted the stability of surface oxides on copper surface which in turn has a synergistic effect on the inhibition effectiveness of BTA. The inhibition of SM and BTA has been attributed to stabilize the effect of surface oxides and the formation of a protective complex layer, respectively.
 

کلیدواژه‌ها [English]

  • Sodium Molybdate
  • 1H-benzotriazole
  • Corrosion
  • Copper, Sea Water

[1]. Al-Borno A., Islam M. and Khraishi R., “Multicomponent corrosion inhibitor system for recirculating cooling water systems based on Nitrite, molybdate, and inorganic phosphate,” Corrosion. Vol. 45, pp. 970–975, 1989.##

[2]. Choi D. J., You S. J. and Kim J. G., “Development of an environmentally safe corrosion, scale, and microorganism inhibitor for open recirculating cooling systems,” Mater. Sci. Eng. A. Vol. 335, pp. 228–235, 2002.##

[3]. Cheng C., Phipps D. and Alkhaddar R. M., “Investigation of changes in the microbial community during the biodegradation of benzotriazole,” in: Built Environ. Nat. Environ. Conf. Liverpool, 2006.##

[4]. Kale R. R., Prasad V., Mohapatra P. P., Tiwari V. K., “Recent developments in benzotriazole methodology for construction of pharmacologically important heterocyclic skeletons,” Monatshefte Für Chemie-Chemical Mon. Vol. 141, pp. 1159–1182, 2010.##

[5]. Finšgar M., Milošev I., “Inhibition of copper corrosion by 1, 2, 3-benzotriazole: a review,” Corros. Sci. Vol. 52, pp. 2737–2749, 2010.##

[6]. Lei Y. H., Sheng N., Hyono A., Ueda M. and Ohtsuka T., “Effect of benzotriazole (BTA) addition on Polypyrrole film formation on copper and its corrosion protection,” Prog. Org. Coatings. Vol. 77, pp. 339–346, 2014.##

[7]. Chen Z., Huang L., Zhang G., Qiu Y., Guo X., “Benzotriazole as a volatile corrosion inhibitor during the early stage of copper corrosion under adsorbed thin electrolyte layers,” Corros. Sci. Vol. 65, pp. 214–222, 2012.##

[8]. Peng S., Zhao W., Li H., Zeng Z., Xue Q. and Wu X., “The enhancement of benzotriazole on epoxy functionalized silica sol–gel coating for copper protection,” Appl. Surf. Sci. Vol. 276, pp. 284–290, 2013.##

[9]. Sastri V. S., “Green corrosion inhibitors: Theory and practice,” John Wiley & Sons, 2012.##

[10]. Vukasovich M. S. and Farr J. P. G., “Molybdate in corrosion inhibition—A review,” Polyhedron. Vol. 5, pp. 551–559, 1986.##

[11]. Saremi M., Dehghanian C. and Sabet M. M., “The effect of molybdate concentration and hydrodynamic effect on mild steel corrosion inhibition in simulated cooling water,” Corros. Sci. Vol. 48, pp. 1404–1412, 2006.##

[12]. Farr J. P. G. and Saremi M., “Molybdate in aqueous corrosion inhibition I: effects of molybdate on the potentiodynamic behaviour of steel and some other metals,” Surf. Technol. Vol. 19, pp. 137–144, 1983.##

[13]. Mustafa C. M. and Shahinoor Islam Dulal S. M., “Molybdate and nitrite as corrosion inhibitors for copper-coupled steel in simulated cooling water,” Corrosion. Vol. 52, pp. 16-22, 1996.##

[14]. A. D1141-98, “Standard practice for the preparation of substitute ocean water,” 2008.##

[15]. Standard A., G1-03, “Stand. Pract. Prep. Cleaning, Eval. Corros. Test Specimens,” Annu. B. ASTM Stand. Vol. 3, pp. 17-25, 2003.##

[16]. Fontana M. G., “Corrosion engineering,” Tata McGraw-Hill Education, 2005.##

[17]. El Din A. M. and Wang S., L., “Mechanism of corrosion inhibition by sodium molybdate,” Desalination. Vol. 107, pp. 29-43, 1996.##

[18]. Kallip S., Bastos A. C., Yasakau K. A., Zheludkevich M. L. and Ferreira M. G. S., “Synergistic corrosion inhibition on galvanically coupled metallic materials,” Electrochem. Commun. Vol. 20, pp. 101-104, 2012.##

[19]. Afshari V. and Dehghanian C., “Inhibitor effect of sodium benzoate on the corrosion behavior of nanocrystalline pure iron metal in near-neutral aqueous solutions,” J. Solid State Electrochem. Vol. 14, pp. 1855–1861, 2010.##

[20]. Sastri V. S., “Green corrosion inhibitors: Theory and practice,” John Wiley & Sons, 2012.##

[21]. Singh A. K., Shukla S. K., Singh M. and Quraishi M. A., “Inhibitive effect of ceftazidime on corrosion of mild steel in hydrochloric acid solution,” Mater. Chem. Phys. Vol. 129, pp. 68-76, 2011.##

[22]. Moretti G., Quartarone G., Tassan A. and Zlngales A., “5-Amino-and 5-chloro-indole as mild steel corrosion inhibitors in 1 N sulphuric acid,” Electrochim. Acta. Vol. 41, pp. 1971–1980, 1996.##

[23]. Atkins P., de Paula, Atkins’J. “Physical Chemistry,” Oxford Univ. Press., 2006.##

[24]. Rao B. V. A. and Kumar K. C., “Effect of hydrodynamic conditions on corrosion inhibition of Cu–Ni (90/10) alloy in seawater and sulphide containing seawater using 1, 2, 3-Benzotriazole,” J. Mater. Sci. Technol. Vol. 30, pp. 65–76, 2014.##

[25]. Nikfahm A., Danaee I., Ashrafi A. and Toroghinejad M. R., “Effect of grain size changes on corrosion behavior of copper produced by accumulative roll bonding process,” Mater. Res. Vol. 16, pp. 1379–1386, 2013.##

[26]. Zhang D., Goun Joo H. and Yong Lee K., “Investigation of molybdate–benzotriazole surface treatment against copper tarnishing,” Surf. Interface Anal. Vol. 41, pp. 164–169, 2009.##

[27]. Khaled K. F., Molecular simulation, “Quantum chemical calculations and electrochemical studies for inhibition of mild steel by triazoles,” Electrochim. Acta. Vol. 53, pp. 3484–3492, 2008.##

[28]. Ahamad I., Prasad R., Quraishi M. A., “Thermodynamic, electrochemical and quantum chemical investigation of some Schiff bases as corrosion inhibitors for mild steel in hydrochloric acid solutions,” Corros. Sci. Vol. 52, pp. 933–942, 2010.##

[29]. Liu C., Bi Q., Leyland A. and Matthews A., “An electrochemical impedance spectroscopy study of the corrosion behaviour of PVD coated steels in 0.5 N NaCl aqueous solution: Part II.: EIS interpretation of corrosion behaviour,” Corros. Sci. Vol. 45, pp. 1257–1273, 2003.##

[30]. Zheludkevich M. L., Yasakau K. A., Poznyak S. K., Ferreira M. G. S., “Triazole and thiazole derivatives as corrosion inhibitors for AA2024 aluminium alloy,” Corros. Sci. Vol. 47, pp. 3368–3383, 2005.##

[31]. Kosec T., Merl D. K. and Milošev I., “Impedance and XPS study of benzotriazole films formed on copper, copper–zinc alloys and zinc in chloride solution,” Corros. Sci. Vol. 50, pp. 1987–1997, 2008. ##