شیمى کاربردى روز

شیمى کاربردى روز

اثر بازدارندگی سورفکتانت های مختلف روی خوردگی فولاد آلیاژی A335 درمحلول سدیم هیدروکسید

نوع مقاله : مقاله علمی پژوهشی

نویسندگان
دانشکده شیمی، دانشگاه سمنان، سمنان، ایران
چکیده
در این پژوهش، عملکرد بازدارندگی خوردگی پنج نوع سورفکتانت مختلف شامل سه سورفکتانت کاتیونی دو دسیل تری متیل آمونیوم بروماید (DOTAB) ، ستیل تری متیل آمونیوم بروماید (CTAB)، ستیل تری متیل آمونیوم کلراید (CTAC)، یک سورفکتانت غیر یونی: تریتون ایکس 100 (Triton X-100) و یک سورفکتانت آنیونی: سدیم دو دسیل سولفات (SDS) روی فولاد آلیاژی A335 در محیط سدیم هیدروکسید ۴ مولار بررسی شد. برای ارزیابی رفتار خوردگی، از روش‌های الکتروشیمیایی پلاریزاسیون تافل و طیف‌سنجی امپدانس الکتروشیمیایی استفاده گردید. نتایج حاصل نشان داد که تمامی سورفکتانت‌ها موجب کاهش سرعت خوردگی نمونه فولاد شده‌اند، ولی بیشترین راندمان بازدارندگی مربوط به DOTAB با راندمان 1/84 درصد و SDS با راندمان 3/85 می باشد. تصاویر میکروسکوپ الکترونی روبشی نیز کاهش آسیب سطحی در حضور این بازدارنده‌ها را تأیید نمودند. نتایج این تحقیق نشان می‌دهد که استفاده از سورفکتانت‌ها می‌تواند روشی مؤثر و اقتصادی برای افزایش مقاومت خوردگی فولاد A335 در محیط‌های قلیایی باشد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

The inhibitory effect of different surfactants on the corrosion of A335 alloy steel in sodium hydroxide solution

نویسندگان English

Abbas Ejlali
Ali Arab
Department of Chemistry, Semnan University, Semnan, Iran
چکیده English

In this study, the corrosion inhibition performance of five different surfactants, including three cationic surfactants: dodecyl trimethyl ammonium bromide (DOTAB), cetyl trimethyl ammonium bromide (CTAB), cetyl trimethyl ammonium chloride (CTAC) a nonionic surfactant: Triton X-100, and an anionic surfactants: sodium dodecyl sulfate (SDS), was investigated on A335 alloy steel in a 4M sodium hydroxide solution. To evaluate the corrosion behavior, electrochemical methods including Tafel polarization and electrochemical impedance spectroscopy were employed. The results showed that all surfactants reduced the corrosion rate of the steel sample, but the highest inhibition was related to DOTAB with an efficiency of 84.1% and SDS with an efficiency of 85.3%. FE-SEM images also confirmed the reduction of surface damage in the presence of these inhibitors. The results of this study indicate that the use of surfactants can be an effective and economical method to increase the corrosion resistance of A335 steel in alkaline environments.

کلیدواژه‌ها English

A335 steel
corrosion inhibitors
sodium hydroxide
inhibition efficiency
electrochemical impedance spectroscopy
Tafel polarization
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