تهیه بازهای شیف جدید برپایه تیوسمی کاربازید و بررسی خواص بازدارندگی آنها بر خوردگی فولاد کربنی در محیط اسیدی

نوع مقاله : مقاله علمی پژوهشی

نویسندگان

گروه شیمی، دانشکده علوم پایه، دانشگاه گیلان، رشت، ایران

چکیده

در این پژوهش دو ترکیب باز شیف با نام های 1- (2-هیدروکسی بنزیلیدین)-4- فنیل تیوسمی کاربازید (2-HTSC) و 1- (3-هیدروکسی بنزیلیدین)-4- فنیل تیوسمی کاربازید (3-HTSC) سنتز و اثر بازدارندگی آن‌ها روی خوردگی فولادکربنی در محیط هیدروکلریک اسید 15% بررسی شد. در این راستا اثر بازدارندگی این دو ترکیب به ‌وسیله‏ی روش‏های کاهش وزن، روش‏های الکتروشیمیایی نظیر اسپکتروسکوپی امپدانس الکتروشیمیایی (EIS) و پلاریزاسیون، آنالیز میکروسکوپ الکترونی روبشی (SEM)، طیف‏سنجی پراش اشعه X (EDX) و ایزوترم جذب مورد بررسی قرار گرفت. غلظت‏های 5/0، 1، 5/1 و 2 میلی‌مولار از بازدارنده بررسی شدند که بهترین نتیجه در غلظت 5/1 میلی‏مولار به‏دست آمد. نتایج نشان داد که باز شیف 3-HTSC درصد بازدارندگی بهتری نسبت به باز شیف 2-HTSC دارد. نتایج حاصل از پلاریزاسیون نشان می‌دهد که بازدارنده‌های مورد استفاده به‌ عنوان بازدانده مختلط عمل کرده و پتانسیل خوردگی را به‌ طور چشمگیری جابه‌جا نمی‌کند. جذب بازارنده‌ها روی سطح فولاد از هم‌ دمای جذب لانگمویر پیروی می‌کند و نتایج حاصل از پارامترهای ترمودینامیکی نشان از جذب فیزیکی-شیمیایی دارد. در حضور بازدارنده میزان جذب سطحی یون‏های مهاجم کلراید بر بستر فلز به ترتیب برای بازدارنده 2-HTSC و 3-HTSC به ترتیب 26% و 74% کاهش یافت که ناشی از غالب بودن برهمکنش‏های بهتر 3-HTSC با بستر فلز در مقایسه با بازدارنده 2-HTSC است.

کلیدواژه‌ها


عنوان مقاله [English]

Preparation of new Schiff bases based on thiosemicarbazide and evaluation of their inhibitory properties on corrosion of carbon steel in acidic environment

نویسندگان [English]

  • Homayoon Eslamizadeh
  • Asadollah Mohammadi
  • Somayeh Mohammadi
Department of Chemistry, Faculty of Basic Sciences, University of Guilan, Rasht, Iran
چکیده [English]

In this work, two Schiff bases named 1-(2-hydroxybenzylidene)-4-phenylthiosemicarbazide (2-HTSC) and 1-(3-hydroxybenzylidene)-4-phenylthiosemicarbazide (3-HTSC) were synthesized and evaluated their inhibitory properties on corrosion of carbon steel in 15% HCl environment. Inhibitory effect of compounds were investigated by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), polarization, Scanning electron microscopy (SEM) analysis, X-ray diffraction (EDX) spectroscopy and absorption isotherms. Concentrations of 0.5, 1, 1.5 and 2 mM of the inhibitor were evaluated and the best result was obtained at a concentration of 1.5 mM. The results showed that the 3-HTSC Schiff base has a better inhibitory percentage than the Schiff base 2-HTSC. Adsorption of inhibitors on the steel surface follows all Langmuir adsorption isotherm and the results of thermodynamic parameters indicate physico-chemical adsorption. In the presence of inhibitor, the adsorption rate of chloride ions on the metal substrate decreased by 26% and 74% for inhibitors 2-HTSC and 3-HTSC, respectively, due to the predominance of better interactions of 3-HTSC with the metal substrate in Comparison with 2-HTSC inhibitor.

کلیدواژه‌ها [English]

  • Corrosion inhibitor
  • Schiff base
  • Thiosemicarbazide
  • Carbon steel
  • Hydrochloric acid

This is an open access article under the CC-BY-SA 4.0 license.( https://creativecommons.org/licenses/by-sa/4.0/)

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