مهندسی متالورژی

مهندسی متالورژی

بررسی رفتار خوردگی پوشش هوشمند کامپوزیتی اصلاح شده LDH با استئاریک اسید

نوع مقاله : مقاله پژوهشی

نویسندگان
ارسلان کارآزما 1
یحیی پالیزدار 2
محمد رضا ابوطالبی 1
وحدت زاهدی 2
1 دانشگاه علم و صنعت ایران
2 پژوهشگاه مواد و انرژی کرج
10.22076/me.2024.1995854.1375
چکیده
در این پژوهش، پوشش آب‌گریز هیدروکسید دوگانه لایه‌ایی Mg-Al LDH بر روی آلیاژ منیزیم 31AZ از طریق یک روش هیدروترمال آسان و به دنبال آن اصلاح شیمیایی توسط استئاریک اسید سنتز شده است. ویژگی پوشش‌های مورد نظر با پراش پرتو ایکس (XRD)، میکروسکوپ الکترونی روبشی (SEM)، طیف سنجی مادون قرمز (FT-IR) مورد بررسی قرار گرفت. الگوهای XRD و SEM نشان دادند که سطوح فیلم LDH در مقیاس نانو/میکرو لایه‌ایی بوده و صفحات LDH تمایل دارند که به صورت عمودی روی سطح رشد کنند. زاویه تماس استاتیک (CA) برای سطوح مختلف نمونه ها محاسبه شد که در حدود 114.4 درجه مشاهده شده است. مقاومت به خوردگی پوشش آب‌گریز LDH-SA با استفاده از طیف سنجی الکتروشیمیایی (EIS) وآزمون پلاریزاسیون دینامیکی (PDP) اندازه گیری شد و مدار معادل سیستم مورد بررسی رسم شد. اندازه‌گیری EIS و منحنی پلاریزاسیون نشان داد که آلیاژ منیزیم پوشش داده شده آب‌گریز، مقاومت به خوردگی بهتری در محلول 3.5 درصد وزنی NaCl داشت. مقدار Z برای پوشش‌ حاوی استئاریک اسید نزدیک به Ω.m2 105 است.
کلیدواژه‌ها
رفتار خوردگی
پوشش
LDH
استئاریک اسید

عنوان مقاله English

Investigating the corrosion behavior of LDH modified smart composite coating using stearic acid

نویسندگان English

Arsalan Karazma 1
Yahya Palizdar 2
Mohammad Reza Abotalebi 1
Vahdat Zahedi 2
1 University of Science and Technology of Iran
2 Materials and Energy Research center (MERC)
چکیده English

In this research, a hydrophobic double layer Mg-Al LDH hydroxide coating has been synthesized on AZ31 magnesium alloy through a facile hydrothermal method followed by chemical modification by stearic acid. The characteristics of the intended coatings were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and infrared spectroscopy (FT-IR). XRD and SEM patterns showed that the LDH film surfaces were nano/micro-layered and the LDH sheets tended to grow vertically on the surface. The static contact angle (CA) was calculated for different surfaces of the samples, which was found to be around 114.4 degree. The corrosion resistance of LDH-SA hydrophobic coating was measured using electrochemical spectroscopy (EIS) and dynamic polarization (PDP) test and the equivalent circuit of the investigated system was drawn. EIS measurement and polarization curve showed that the hydrophobic coated magnesium alloy had better corrosion resistance in 3.5 wt% NaCl solution. The value of Z for the coating containing stearic acid is close to 10^5 Ω.m^2.

کلیدواژه‌ها English

corrosion behavior
coating
LDH
stearic acid
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  • تاریخ دریافت 20 اسفند 1401
  • تاریخ بازنگری 30 مرداد 1402
  • تاریخ پذیرش 15 اسفند 1402