بررسی اثرات بازدارندگی خوردگی دو مشتق تیازولی برآلیاژ فولاد در اسید کلریدریک

محورهای موضوعی : خوردگی و حفاظت مواد

ایمان دانایی ¹ , علیرضا حسین زاده ² , محمدحسین مداحی ³

1 - دانشگاه صنعت نفت آبادان
2 - کارشناسی ارشد، دانشکده نفت آبادان
3 - مربی، دانشگاه صنعت نفت، دانشکده نفت آبادان

تاریخ دریافت : 1395/09/04 تاریخ پذیرش : 1395/12/21 تاریخ انتشار : 1395/12/01

کلید واژه: طیف سنجی امپدانس الکتروشیمیایی, بازدارندگی, خوردگی, مشتقات تیازولی, پلاریزاسیون,

چکیده مقاله :

درصنایع محلول های اسیدی به طور گسترده برای اسید شویی، جرم گیری، اسیدی کردن چاههای نفت و از بین بردن آلودگیهای سطحی به کار می روند. روش حفاظتی مطلوب استفاده از ممانعت کننده های خوردگی سازگار با محیط زیست میباشد. در تحقیق ارائه شده، توانایی بازدارندگی 2- مرکاپتوبنزوتیازول (MBT) و 2- آمینو5- نیتروتیازول (Nitramine) (دو مشتق تیازولی) در برابر خوردگی فولاد AISI 4130 در محیط 1 مولار اسید کلریدریک ارزیابی شد. برای این منظور از روش های پلاریزاسیون تافل (Tafel) و طیف سنجی امپدانس الکتروشیمیایی (EIS) استفاده شد. مطالعات پلاریزاسیون نشان داد که MBT سرعت دو واکنش کاتدی و آندی و Nitramine سرعت واکنش آندی را از طریق جذب شیمیایی روی سطح و مسدود کردن سایت های فعال خوردگی کاهش می دهند. مدار معادل استخراج شده از داده های آزمایش EIS نشان داد که باافزایش غلظت بازدارنده، مقاومت انتقال بار در فولاد افزایش و ظرفیت خازن های دو لایه کاهش یافت. پارامترهای ترمودینامیکی مانند آنتالپی، آنتروپی و انرژی آزاد جذب محاسبه شد ومیکروسکوپ نیروی اتمی (AFM) برای مشاهده ی سطح فولاد در غیاب ودر حضوربازدارنده ها مورد استفاده قرار گرفت.

چکیده انگلیسی:

In most industrial processes, acidic solution are commonly used for the pickling, industrial acid cleaning, acid descaling, oil well acidifying, etc. Corrosion prevention systems favor the use of corrosion inhibitors with low or zero environmental impacts. In this work, the inhibition ability of 2-Mercaptobenzothiazole (MBT) and 2-amino-5-nitrothiazole (Nitramine) (two thiazole derivatives) against the corrosion of AISI steel 4130 in 1 M HCl solution were evaluated by polarization and electrochemical impedance spectroscopy (EIS). Polarization studies indicated that MBT retards both the cathodic and anodic reaction and Nitramine retards anodic reaction through chemical adsorption and blocking the active corrosion sites. EIS data was analyzed to equivalent circuit model shows that as the inhibitor concentration increased the charge transfer resistance of steel increased whilst double layer capacitance decreased. Thermodynamic parameters such as activation energy, enthalpy, entropy and free energy of adsorption were calculated and Atomic force microscopy (AFM) was used to study the steel surface with and without inhibitors.

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