مطالعه اثر دما و غلظت ممانعت کننده ایمیدازولینی سنتز شده و بر همکنش آن‌ها بر خوردگی فولاد کربنی به روش DOE

محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین

سیروس جوادپور ¹ , محمدابراهیم بحرالعلوم ² , مرتضی رودکی ³

1 - بخش مهندسی و علم مواد، دانشکده مهندسی، دانشگاه شیراز، شیراز، ایران
2 - بخش مهندسی و علم مواد، دانشکده مهندسی، دانشگاه شیراز، شیراز، ایران
3 - بخش مهندسی و علوم مواد، دانشکده مهندسی، دانشگاه شیراز

تاریخ دریافت : 1400/09/14 تاریخ پذیرش : 1400/12/02 تاریخ انتشار : 1400/09/01

کلید واژه: مقاومت به خوردگی, آزمون امپدانس الکتروشیمیایی, FTIR, ممانعت کننده خوردگی, آزمون پلاریزاسیون تافل, DOE, آزمون‌های الکتروشیمیایی, HNMR,

چکیده مقاله :

مطالعه پارامترهای مختلف از قبیل دما و غلظت ممانعت کننده بر رفتار ممانعت‌کنندگی یک ماده در پژوهش های مختلف مورد بحث و بررسی بوده است. حال‌آنکه بررسی هم‌زمان اثر هر دو پارامتر و همچنین تداخل اثر آن ها مبحثی کمتر پرداخته شده است که نیازمند دیدی دقیق‌تر است و بحث پژوهش حاضر می‌باشد. در این پژوهش یک ممانعت کننده امیدازولینی با استفاده از اولئیک اسید و دی اتیلن تری آمین (DETA) تولید شد. مشخصه یابی ترکیب تولید شده به‌وسیله روش‌های FTIR و HNMR صورت پذیرفت. همچنین به‌منظور بررسی خواص ممانعت‌کنندگی ترکیب تولید شده، آزمون­های پلاریزاسیون تافل و طیف‌سنجی امپدانس الکتروشیمیایی (EIS) در محیط %NaCl 3wt  اشباع از گاز CO₂ انجام شد. پتاسیم یدید نیز به محیط حاوی ممانعت کننده افزوده شد و تأثیر آن مورد بررسی قرار گرفت. میزان بهینه نرخ خوردگی­هایی که به‌وسیله آزمون های الکتروشیمیایی اندازه‌گیری شد به کمک نرم‌افزار Design Expert 10.0.7، با طراحی central composite design و روش response surface  تخمین زده شد. نرم‌افزار DOE پیش‌بینی می‌کند که بیشترین ممانعت‌کنندگی از خوردگی در دمای 25^oC و با غلظت ppm 100 از ممانعت کننده سنتز شده و با حضور ppm KI 2000 اتفاق می افتد. نرخ خوردگی و مقاومت پلاریزاسیون پیش‌بینی شده در این شرایط توسط نرم افزار، به ترتیب µm/year 8.822 و Ω  35339 می‌باشد. رفتار جذبی ممانعت کننده تولید شده با ایزوترم جذب Langmuir مطابقت دارد و افزودن KI تأثیری بر مکانیزم جذب ندارد.
 

چکیده انگلیسی:

An imidazoline based inhibitor was synthesized using oleic acid and diethylenetriamine (DETA). The characteristic properties of the synthesized inhibitor were investigated by FTIR and HNMR tests. Tafel polarization technique and electrochemical impedance spectroscopy (EIS) were used to study the electrochemical and corrosion inhibition properties of the inhibitor in CO2 saturated 3% NaCl solution. Potassium iodide was added to the corrosion media to enhance the inhibition efficiency of the inhibitor. The measured corrosion rates were optimized by Design Expert 10.0.7 software using central composite design and response surface method. Temperature and inhibitor concentration were selected as the most effective parameters. Analyses of variance (ANOVA) were performed on the results of the designed experiments. It was found that temperature and inhibitor concentration effects on corrosion rate and inhibition efficiency are complicated and their interactions. Addition of KI to the inhibitor system had a synergistic effect on the corrosion inhibition. It almost eliminated the dependency of the corrosion rate to temperature and inhibitor concentration which is a great achievement in inhibitor applications in oil and gas industries. DOE data revealed that the best inhibition of corrosion occurred at 25oC with 37.7ppm of synthesized Imidazoline inhibitor and 2000ppm KI. It is estimated by the software that at this point the corrosion rate is 6µm/year and polarization resistance is 30788Ω. The synthesized inhibitor conforms perfectly to the Langmuir adsorption isotherm.

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