بررسی عملکرد بازدارندگی خوردگی عصاره آبی دارچین روی فولاد ساده کربنی در محیط اسید هیدروکلریک 1 مولار

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی شیمی، دانشکده مهندسی، دانشگاه گلستان، علی‌آباد کتول، ایران

2 گروه پوشش‌های سطح و خوردگی، پژوهشگاه رنگ، تهران، ایران

چکیده

بازدارنده‌های خوردگی یک روش آسان و اقتصادی جهت کنترل خوردگی فلزات در محیط‌های اسیدی می‌باشد. در این راستا بازدارنده‌های خوردگی سبز بر پایه عصاره گیاهان به‌عنوان یک جایگزین مناسب بازدارنده‌های خوردگی سنتزی رایج که عمدتاً دوست‌دار محیط‌زیست نمی‌باشند مورد توجه فراوان قرار گرفته است. حضورترکیبات فعال درعصاره آبی دارچین آن را به‌ یک منبعی از بازدارنده‌های سبز در کنترل خوردگی فولاد تبدیل کرده است. در این مطالعه عملکرد بازدارندگی عصاره دارچین توسط آزمون‌های الکتروشیمیایی و روش‌های تحلیل سطحی مورد بررسی قرار گرفت. نتایج طیف‌سنجی امپدانس الکتروشیمیایی نشان داد که پس از 2.5 ساعت غوطه‌وری فولاد در محلول 1 مولار اسید هیدروکلریکحاوی ppm 800عصاره دارچین،بازده بازدارندگی خوردگی 88% به دست آمد. علاوه­بر­این، نتایج حاصل از آزمون پلاریزاسیون پتانسیودینامیک کاهش چشمگیر چگالی جریان خوردگی و نرخ واکنش‌های آندی و کاتدی را نشان داد. تصاویر میکروسکوپی الکترونی و اتمی، تخریب کم سطح فلز که بیانگر تشکیل لایه محافظ بازدارنده روی سطح فولاد است را نشان دادند. هم‌چنین جذب بازدارنده بر روی سطح از ایزوترم جذب لانگمویر پیروی نمود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Studying the Inhibition Action of Aqueous Extract of Cinnamomum Verum for Carbon Steel in 1 M HCl Solution

نویسندگان [English]

  • A. Dehghani 1
  • Gh. Bahlakeh 1
  • B. Ramezanzadeh 2
1 Department of Chemical Engineering, Faculty of Engineering, Golestan University,Aliabad Katoul, Iran
2 Department of Surface Coatings and Corrosion, Institute for Color Science and Technology, Tehran, Iran
چکیده [English]

Corrosion inhibitors are a simple and economic method for corrosion control of metals in acidic environments. In this regard, green corrosion inhibitors based on plant extracts have received much attention as a suitable replacement to the synthetic and environmentally unsafe inhibitors. The presence of various active compounds in the aqueous extract of Cinnamomum Verum converted it to a rich source of green inhibitors for steel corrosion control. In this study, the inhibition action of Cinnamomum Verum extract was evaluated by electrochemical and surface analysis methods. The electrochemical impedance spectroscopy (EIS) results demonstrated that after 2.5 h steel immersion in 1 M HCl solution containing 800 ppm inhibitor 88% inhibition efficiency was obtained. In addition, the potentiodynamic polarization results indicated the significant reduction of corrosion current density, anodic and cathodic reactions rates. The images of scanning electron microscopy and atomic force microscopy evidenced the lower steel surface damage, indicating formation of inhibitor film over the steel surface. Furthermore, the inhibitor adsorption obeyed the Langmuir adsorption isotherm.

کلیدواژه‌ها [English]

  • Carbon steel
  • Corrosion
  • Green inhibitor
  • Potentiodynamic polarization
  • EIS
  • SEM
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