مقایسه رفتار فوق‌آب‌گریزی به همراه خواص ضدخوردگی، ضدیخ‌زدگی و خودتمیزشوندگی پوشش‌های نیکل و کبالت حاصل از یک مرحله رسوب‌دهی الکتریکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان

2 مرکز تحقیقات دندانی، موسسه تحقیقات دندان، دانشکده دندانپزشکی، دانشگاه علوم پزشکی اصفهان

چکیده

در این پژوهش پوشش‌های فوق‌آب‌گریز نیکل و کبالت با ساختار سلسله‌مراتبی میکرو- نانومتری طی یک مرحله رسوب‌دهی الکتریکی سریع روی زیرلایه مسی ایجاد شد. ریزساختار، ترشوندگی، مقاومت به خوردگی، خاصیت‌های خودتمیزشوندگی و ضدیخ‌زدگی پوشش‌ها به‌ترتیب از طریق میکروسکوپ الکترونی روبشی، اندازه‌گیری زاویه تماس، آزمون امپدانس الکتروشیمیایی، استفاده از پودر آلومینا به‌عنوان آلودگی و قرارگیری در دمای منفی 15 درجه سانتی‌گراد ارزیابی شدند. طبق نتایج حاصل، انجماد قطره آب روی سطح پوشش نیکل با زاویه تماس بالاتر (172/3 درجه) نسبت به پوشش کبالت (155/6 درجه)، در حدود 6 دقیقه دیرتر رخ می‌دهد. هر دو پوشش به دلیل انرژی سطحی پایین از روغن‌گریزی خوبی برخوردار بودند و برای گلیسرول و اتیلن‌گلیکول زوایای تماس آب بالای 120 درجه را به همراه داشتند. مقاومت انتقال بار بسیار بالای 2370 و 756/3 کیلو اهم در سانتی‌متر مربع به‌ترتیب برای پوشش‌های نیکل و کبالت پس از رسیدن به پتانسیل مدار باز در محلول 3/5 درصد نمک ثبت شد. پس از 16 روز غوطه‌وری در محلول آب‌نمک، زاویه تماس پوشش‌ها همچنان در محدوده آب‌گریز و به‌ترتیب معادل 128/7 درجه و 98/6 درجه برای پوشش‌های نیکل و کبالت به‌دست آمد. برای پوشش کبالت، با وجود رفتار ترشوندگی ضعیف‌تر، خاصیت خودتمیزشوندگی بهتری مشاهده شد که به مناسب‌تر بودن میکروساختار سطحی آن در مقایسه با پوشش نیکل مربوط است.

کلیدواژه‌ها


عنوان مقاله [English]

Comparison of Superhydrophobicity, Anti-Corrosion, Anti-Icing, and Self-Cleaning Properties of Nickel and Cobalt Coatings Fabricated by one-Step Electrodeposition

نویسندگان [English]

  • A. Daneshnia 1
  • K. Raeissi 1
  • P. Salehikahrizsangi 2
1 Department of Materials Engineering, Isfahan University of Technology, Isfahan 8415683111, Iran
2 Dental Research Center, Dental Research Institute, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
چکیده [English]

In this research, superhydrophobic nickel and cobalt coatings with a hierarchical micro-nano structure were deposited on copper substrate by rapid one-step electrodeposition. The microstructure, wettability, corrosion resistance, self-cleaning and anti-icing properties of the coatings were evaluated using a scanning electron microscope (SEM), contact angle measurement, electrochemical impedance spectroscopy (EIS), alumina powder as contaminants and keeping at minus 15 °C, respectively. According to the obtained results, nickel coating with a higher contact angle of 172.3° delays the freezing of the droplet on the surface by 6 min more than the cobalt coating with a lower contact angle of 155.6°. The surface energies of both coatings were low enough to benefit from oleophobicity and for glycerol and ethylene glycol, both coatings had water contact angles higher than 120°. When the open circuit potentials were atablized in 3.5 wt.% NaCl solution, very high charge transfer resistances of 2370 and 756.3 kΩ.cm2 were recorded for nickel and cobalt coatings, respectively. After 16 days of immersion in saline solution, the contact angles were still in the hydrophobic range (128.7° and 98.6° for nickel and cobalt coatings, respectively). For cobalt coating with more appropriate surface microstructure and despite its lower water contact angle compared to nickel coating, better self-cleaning properties were observed.

کلیدواژه‌ها [English]

  • Superhydrophobicity
  • Electrodeposition
  • Corrosion resistance
  • Oleophobicity
  • Anti-icing
  • Self-cleaning
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