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
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