رسوب‌دهی الکتریکی پوشش نیکل- مولیبدن بر فولاد زنگ‌نزن جهت استفاده به‌عنوان صفحات دوقطبی پیل سوختی پلیمری

نویسندگان

دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان، اصفهان

چکیده

صفحات دوقطبی فولاد زنگ‌نزن گزینه‌ای مناسب جهت به کارگیری در پیل سوختی پلیمری هستند، لیکن با توجه به دمای کاری 80 درجه سانتی‌گراد و محیط اسیدی و خورنده پیل سوختی پلیمری، برای افزایش پایداری و عمر مفید صفحات دوقطبی فلزی نیاز است تا سطح آنها با اعمال پوشش‌های هادی الکتریسیته و مقاوم به خوردگی محافظت شود. در این پژوهش، با اعمال پوشش‌هایNi–Mo  و Ni–Mo–P به روش رسوب‌دهی الکتریکی بر صفحه دوقطبی فولاد زنگ‌نزن L‌316، مقاومت به خوردگی بهبود و تشکیل لایه‌های اکسیدی روی سطح زیرلایه که عامل افزایش مقاومت الکتریکی است، کاهش یافته و عملکرد صفحات دوقطبی پیل بهبود یافت. بررسی‌های انجام شده شامل مطالعات ریزساختاری و فازی برای بررسی ترکیب پوشش‌های اعمالی، آزمون ولتامتری سیکلی جهت بررسی رفتار الکتروشیمیایی، آزمون ترشوندگی سطح پوشش‌ها جهت تعیین میزان آبگریزی، آزمون مقاومت تماسی برای تعیین مقاومت الکتریکی پوشش و آزمون پلاریزاسیون پیل سوختی جهت بررسی عملکرد صفحات دوقطبی در شرایط کاری در یک سلول پیل سوختی است. درنهایت نتایج نشان دادند که پوشش‌های فوق به‌طور مؤثری خوردگی و مقاومت الکتریکی تماسی فولاد زنگ‌نزن  را کاهش دادند.

کلیدواژه‌ها

عنوان مقاله [English]

Electroplating of Ni-Mo Coating on Stainless Steel for Application in Proton Exchange Membrane Fuel Cell Bipolar Plate

نویسندگان [English]

  • H. Rashtchi
  • K. Raeissi
  • M. Shamanian
  • K. Raeissi
Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran.
چکیده [English]

Stainless steel bipolar plates are preferred choice for use in Proton Exchange Membrane Fuel Cells (PEMFCs). However, regarding the working temperature of 80 °C and corrosive and acidic environment of PEMFC, it is necessary to apply conductive protective coatings resistant to corrosion on metallic bipolar plate surfaces to enhance its chemical stability and performance. In the present study, by applying Ni-Mo and Ni-Mo-P alloy coatings via electroplating technique, corrosion resistance was improved, oxid layers formation on substrates which led to increased electrical conductivity of the surface was reduced and consequently bipolar plates fuction was enhanced. Evaluation tests included microstructural and phase characterizations for evaluating coating components; cyclic voltammetry test for electrochemical behavior investigations; wettability test for measuring hydrophobicity characterizations of the coatings surfaces; interfacial contact resistance measurements of the coatings for evaluating the composition of applied coatings; and polarization tests of fuel cells for evaluating bipolar plates function in working conditions. Finally, the results showed that the above-mentioned coatings considerably decreased the corrosion and electrical resistance of the stainless steel.

کلیدواژه‌ها [English]

  • PEM fuel cell
  • Bipolar plate
  • Ni-Mo coatings
  • Electroplating
  • wettability
  • Polarization test

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مواد پیشرفته در مهندسی
دوره 36، شماره 4
اسفند 1396
صفحه 1-20

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