شیمى کاربردى روز

شیمى کاربردى روز

بررسی ریزساختار و رفتار خوردگی پوشش‌های Zn-Co-Al2O3 ایجاد شده روی فولاد St37 توسط روش آبکاری الکتریکی در الکترولیت‌های با pH متفاوت‌

نوع مقاله : مقاله علمی پژوهشی

نویسندگان
1 بخش مهندسی مواد، دانشکده فنی و مهندسی، دانشگاه شهید باهنر کرمان، کرمان، ایران
2 بخش مهندسی مواد، دانشکده مهندسی مکانیک و مواد، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، ایران
3 گروه مهندسی مکانیک، دانشکده فنی و مهندسی، مجتمع آموزش عالی بم، بم، کرمان، ایران
چکیده
در مطالعه حاضر با تغییر pH الکترولیت آبکاری، پوشش‌های کامپوزیتی Zn-Co-Al2O3 متفاوتی روی زیرلایه فولادیSt37 ایجاد شد. پس از پوشش‌دهی در pHهای 5/4، 5 و 5/5 ریزساختار پوشش‌ها توسط میکروسکوپ الکترونی روبشی (SEM) بررسی شد. همچنین رفتار خوردگی نمونه‌های آزمایش در محلول wt% 5/3 کلرید سدیم توسط آزمون‌های پلاریزاسیون پتانسیودینامیک و طیف‌نگاری امپدانس الکتروشیمیایی (EIS) ارزیابی شدند. نتایج نشان داد با افزایش pH اندازه کریستالی پوشش ریزتر شده و میزان ذرات اکسید آلومینا افزایش یافت. تحلیل داده‌های پلاریزاسیون نیز نشان داد که اعمال پوشش منجر به کاهش چگالی جریان خوردگی فولاد می‌شود و این کاهش چگالی جریان برای نمونه پوشش داده شده در 5/5=pH نسبت به سایر نمونه‌های پوشش داده شده بیشتر است. بررسی نتایج امپدانس الکتروشیمیایی نیز نشان داد که مقاومت انتقال بار برای پوشش‌های تشکیل شده در pHهای 5/4، 5 و 5/5 تقریباً به ترتیب برابر با 345، 547 و Ω.cm2682 است؛ این مقادیر بیانگر مقاومت به خوردگی بالاتر نمونه پوشش داده در 5/5=pH نسبت به سایر نمونه‌ها است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Microstructural and Corrosion Behavior Analysis of Zn-Co-Al2O3 Coatings Deposited on St37 Steel by Electroplating in Electrolytes with Different pH Values

نویسندگان English

Parisa Zandi 1
Hadi Ebrahimifar 2
Farhad Mohsenifar 3
1 Department of Materials Engineering and Metallurgy, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran
2 Department of Materials Engineering, Faculty of Mechanical and Materials Engineering, Graduate University of Advanced Technology, Kerman, Iran
3 Mechanical Engineering Department, Faculty of Engineering, Higher Education Complex of Bam, Bam, Kerman, Iran
چکیده English

In the present study, by varying the pH of the electroplating electrolyte, different Zn-Co-Al2O3 composite coatings were deposited on an St37 steel substrate. After coating at pH values of 4.5, 5, and 5.5, the microstructure of the coatings was examined using a scanning electron microscope (SEM). The corrosion behavior of the test samples in 3.5 wt% sodium chloride solution was also evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results showed that increasing the pH led to finer crystallite size and a higher amount of alumina particles in the coatings. Polarization data analysis also revealed that applying the coating reduced the corrosion current density of steel, with the coating deposited at pH=5.5 exhibiting the most significant reduction compared to the other coated samples. Furthermore, EIS results indicated that the charge transfer resistance of the coatings formed at pH values of 4.5, 5, and 5.5 was approximately 345, 547, and 682 Ω.cm2, respectively. These values confirm that the coating deposited at pH=5.5 has superior corrosion resistance compared to the others.

کلیدواژه‌ها English

Zn-Co-Al2O3 composite coating
Corrosion resistance
pH
Electroplating
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