علوم و فناوری کامپوزیت

علوم و فناوری کامپوزیت

تأثیر دمای حمام آبکاری بر میکروساختار و رفتار خوردگی پوشش کامپوزیتی Zn-Co تقویت شده توسط ذرات Al2O3

نوع مقاله : مقاله پژوهشی

نویسندگان
1 کارشناس ارشد، بخش مهندسی مواد و متالورژی، دانشکده فنی و مهندسی، دانشگاه شهید باهنر کرمان، کرما ن.
2 دانشیار، بخش مهندسی مواد، دانشکده مهندسی مکانیک و مواد، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرما ن.
3 استادیار، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، مجتمع آموزش عالی بم، بم.
چکیده
در تحقیق حاضر اثر دمای حمام آبکاری (30، 35 و 40°C) روی میکروساختار و رفتار خوردگی پوشش کامپوزیتی Zn-Co-Al2O3 ایجاد شده روی زیرلایه فولادی St37 بررسی شد. میکروساختار و مورفولوژی سطح نمونه‌ها توسط میکروسکوپ الکترونی روبشی (SEM) مورد بررسی قرار گرفت. به منظور بررسی مقاومت به خوردگی نمونه بدون پوشش و نمونه‌های پوشش‌دار در محلول آبی NaCl 3.5 wt%، از آزمون‌های پلاریزاسیون پتانسیودینامیک و طیف‌نگاری امپدانس الکتروشیمیایی (EIS) استفاده شد. بررسی میکروساختار پوشش‌ها نشان داد که پوشش تشکیل شده در دمای 40°C نسبت به سایر پوشش‌ها از انسجام و یکنواختی بیشتری برخوردار است. علاوه بر این درصد ذرات Al2O3 در پوشش در این دما بیشترین مقدار ممکن است. اثر مثبت پوشش در افزایش مقاومت به خوردگی فولاد برای پوشش تشکیل شده در دمای 40°C نسبت به سایر پوشش‌ها چشمگیرتر است. در این حالت مقاومت پلاریزاسیون و دانسیته جریان خوردگی بدست‌آمده از آزمون پلاریزاسیون پتانسیودینامیک برای این پوشش نسبت به سایر پوشش‌ها به ترتیب بیشترین و کمترین مقدار خود را دارد. ظرفیت پوشش تشکیل شده در دمای 40°C نسبت به سایر پوشش‌ها در آزمون طیف‌نگاری امپدانس الکتروشیمیایی نیز مقاومت به خوردگی بالاتر این پوشش را تأیید نمود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

The effect of electroplating temperature on microstructure of corrosion behavior of Al2O3 particles reinforced Zn-Co composite coating

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, the effect of bath temperature (30, 35, and 40°C) on the microstructure and corrosion behavior of the Zn-Co-Al2O3 composite coating deposited on St37 steel substrate was investigated. The microstructure and corrosion behavior of the coating were studied by changing the bath temperature during electroplating. The coatings were deposited at 30, 35, and 40°C. The microstructure and surface morphology of the samples were investigated by scanning electron microscopy (SEM). Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests were performed in a 3.5 wt% NaCl aqueous solution to investigate the corrosion resistance of the uncoated and coated samples. The microstructural examination of the coatings revealed that the coating formed at 40°C had more cohesion and uniformity than the other coatings. Furthermore, the percentage of Al2O3 particles in the coating was maximum at this temperature. The positive effect of the coating on enhancing the corrosion resistance of the steel was more pronounced for the coating formed at 40°C compared to the others. In this case, the polarization resistance obtained from the potentiodynamic polarization test was the highest, while the corrosion current density was the lowest for this coating compared to the others. The lower capacitance of the coating formed at 40°C compared to the other coatings in the electrochemical impedance spectroscopy test also confirmed the higher corrosion resistance of this coating.

کلیدواژه‌ها English

Zn-Co-Al2O3 composite coating
Temperature
Corrosion
Potentiodynamic polarization
Electrochemical impedance spectroscopy
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