بررسی اثر هم‌افزایی ذرات نرم و سخت بر رفتار مقاومت به خوردگی و سایش پوشش الکترولس Ni-B-PTFE-Si3N4 روی فولاد ساده کربنی

محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین

دانیال بهروزی ¹ (دانشکده فنی و مهندسی ، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران)
ناهید پیرهادی تواندشتی ² (استادیار، دانشکده فنی و مهندسی، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران)

تاریخ دریافت : 1399/08/06 تاریخ پذیرش : 1400/04/08 تاریخ انتشار : 1400/03/01

کلید واژه: مقاومت به خوردگی, مقاومت به سایش, پوشش الکترولس Ni-B, ذرات PTFE, نانوذرات Si3N4,

چکیده مقاله :

شدند و پوشش نانوکامپوزیتی Ni-B-PTFE-Si₃N₄ روی فولاد ساده کربنی تهیه شد. ریزساختار و مورفولوژی پوشش­ها توسط میکروسکوپ الکترونی روبشی و مقاومت به خوردگی توسط پلاریزاسیون پتانسیودینامیک و طیف­سنجی امپدانس الکتروشیمیایی بررسی شد. نتایج نشان داد که با افزودن ذرات PTFE به حمام پوشش­دهی، این ذرات بطور موفقیت آمیزی در تشکیل پوشش شرکت می­کنند. بهترین مقاومت به خوردگی در پوشش Ni-B-PTFE در غلظت g/L 3 و با چگالی جریان خوردگی µA/cm² 3/2 به دست آمد. هم­چنین، افزودن نانوذرات سخت  Si₃N₄به پوشش Ni-B می­تواند منجر به افزایش تراکم پوشش و بهبود مقاومت به خوردگی گردد. بهترین مقاومت به خوردگی در پوشش Ni-B- Si₃N₄در غلظت g/L 4 و با چگالی جریان خوردگی µA/cm² 2/2 به دست آمد. به کار بردن همزمان ذرات سخت و نرم در پوشش منجر به افزایش مقاومت به خوردگی شده و کمترین چگالی جریان خوردگی برابر با µA/cm² 76/0 حاصل شد. نتایج سختی­سنجی و آزمون سایش نشان داد که افزودن نانوذرات سخت Si₃N₄منجر به افزایش سختی و ضریب اصطکاک پوشش Ni-B از HV 847 و 6/0 به HV 963 و 78/0 می­گردد. همچنین افزودن ذرات PTFE منجر به کاهش سختی و ضریب اصطکاک به HV 572 و 35/0 می­شود. به کار بردن همزمان ذرات سخت و نرم، میزان سختی HV 871 و ضریب اصطکاک 6/0 را نتیجه داد.

چکیده انگلیسی:

In this study, soft PTFE particles and hard Si3N4 nanoparticles were simultaneously introduced into the Ni-B electroless coating and the Ni-B-PTFE-Si3N4 nanocomposite coating was prepared on plain carbon steel. The microstructure and morphology of the coatings were examined by scanning electron microscopy, and the corrosion resistance was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The results showed that by introducing PTFE particles into the coating bath, Ni-B-PTFE composite coating was successfully prepared. The best corrosion resistance of Ni-B-PTFE coating was achieved when a concentration of 3 g/L PTFE particles were used. The corrosion current density was 2.3 μA/cm2. However, introduction of Si3N4 nanoparticles into the Ni-B coating can also improve the corrosion resistance of the coating. The best corrosion resistance of Ni-B-Si3N4 coating was obtained at a concentration of 4 g/L Si3N4 nanoparticles, with a corrosion current density of 2.2 μA/cm2. Simultaneous application of hard and soft particles in the coating increased corrosion resistance, and the corrosion current density was 0.76 μA/cm2 for Ni-B-PTFE-Si3N4 coating. The results of hardness and abrasion tests showed that the addition of Si3N4 nanoparticles leads to an increase in the hardness and friction coefficient of Ni-B coating from 847 Vickers and 0.6 to 963 Vickers and 0.78, respectively. Nevertheless, the incorporation of PTFE particles reduces the hardness and coefficient of friction to 572 Vickers and 0.35, respectively. Simultaneous application of hard and soft particles resulted a hardness of 871 Vickers and friction coefficient of 0.6.

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