شیمى کاربردى روز

شیمى کاربردى روز

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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