شیمى کاربردى روز

شیمى کاربردى روز

بررسی رفتار ترکیبات آزو-آزومتین برای محافظت از فولاد A516 در مقابل خوردگی در محلول هیدروکلریک اسید

نوع مقاله : مقاله علمی پژوهشی

نویسندگان
1 گروه شیمی معدنی- دانشکده شیمی و علوم نفت- دانشگاه بوعلی سینا
2 گروه شیمی، دانشکده علوم پایه، دانشگاه اراک، 384817758-اراک، ایران
چکیده
دو ترکیب آزو-آزومتین جدید 1L، با ساختار مسطح، و 2L، با ساختار سه پایه‌ای، به ترتیب از واکنش‌ تراکمی 1-( 3- فرمیل-4-هیدروکسی فنیل آزو)-4-کلروبنزن با 2- آمینو نفتالن و تریس(2-آمینو اتیل) آمین سنتز و با استفاده از روش‌های FT-IR ، H NMR1 و تجزیه عنصری شناسایی شدند. رفتار بازدارندگی 1L و 2L برای محافظت از خوردگی فولاد A516در محلول هیدروکلریک اسید با استفاده از روش‌های انداز‌ه‌گیری کاهش وزن، طیف‌سنجی امپدانس الکتروشیمیایی و قطبش تافل در غلظت‌ها و دماهای مختلف مورد مطالعه قرار گرفت. مطالعه
FE-SEM و AFM سطح فولاد قبل و بعد از قرارگرفتن در محیط اسیدی، در حضور و یا عدم حضور بازدارنده‌ها نشان می‌دهد 1L به دلیل ساختار مسطح، لایه پوششی مناسبی در سطح فولاد تشکیل می‌دهد و به‌عنوان یک بازدارنده مناسب، در مقایسه با 2L، به‌طور موثری از فولاد A516 در برابر خوردگی در محلول هیدروکلریک اسید M 0.1 محافظت می‌کند. بازده بازدارندگی از خوردگی فولاد با افزایش غلظت 1L تا مقدار بهینه µmol/lit 40 به 73.70% میرسد و بعد از آن با افزایش غلظت بازدارنده، بازده بازدارندگی کاهش پیدا می‌کند. بررسی رفتار فصل مشترک محلول هیدروکلریک اسید حاوی 1L و فولاد بر اساس آزمون امپدانس الکتروشیمیایی نشان می‌دهد در غلظت‌های بالاتر از مقدار بهینه، مقاومت انتقال بار سطح فولاد کاهش می‌یابد که در نتیجه آن نرخ خوردگی فولاد در محیط خورنده افزایش پیدا می‌کند. منحنی‌های پلاریزاسیون تافل نشان می‌دهند مکانیزم عملکرد 1L برای محافظت از خوردگی فولاد در برابر خوردگی در محیط خورنده ذکر شده از نوع مختلط، و تا اندازه‌ای متمایل به بازدارندگی کاتدی، است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Investigation of Azo-Azomethine Compounds for Corrosion Protection of A516 Steel in Hydrochloric Acid Solution

نویسندگان English

Hamid Khanmohammadi 1
Shakila Dehnadi 2
1 Department of Inorganic Chemistry, Faculty of Chemistry and Petroleum Sciences, Bu-Ali Sina University, Hamedan, Iran
2 Department of Chemistry, Faculty of Science, Arak University, Arak 384817758, Iran
چکیده English

Two new azo-azomethine compounds, L1, with a planar structure, and L2, with a tripodal structure, were synthesized from the condensation reaction of 1-(3-formyl-4-hydroxyphenylazo)-4-chlorobenzene with 2-aminonaphthalene and tris(2-aminoethyl)amine, respectively, and characterized using FT-IR, 1H NMR, and elemental analysis. The inhibitory behaviour of L1 and L2 for corrosion protection of A516 steel in 0.1 M hydrochloric acid solution was studied by weight loss measurements, electrochemical impedance spectroscopy, and Tafel polarization at different concentrations and temperatures. FE-SEM and AFM studies of the steel surface before and after exposure to an acidic environment, in the presence or absence of the current inhibitor, show that L1 forms a suitable coating layer on the steel surface due to its planar structure and, as a suitable inhibitor, effectively protects A516 steel against hydrochloric acid solution compared to L2. The inhibition efficiency of steel corrosion reaches 73.7 % with an increase L1 concentration up to the optimum value of 40 µmol/lit. After further increases in inhibitor concentration, the inhibition efficiency decreases. Electrochemical impedance analysis of the HCl/L1/steel interface reveals that at concentrations above the optimum, charge-transfer resistance of the steel surface declines, resulting in an increased corrosion rate. Tafel polarization curves indicate that the inhibition mechanism of L1 is mixed type, with a slight inclination toward cathodic inhibition.

کلیدواژه‌ها English

Corrosion
Corrosion Inhibitors
Azo-Azomethine
Hydrochloric Acid
Weight loss Measurement
Electrochemical Impedance Spectroscopy
Tafel Polarization
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