اثر غلظت ذرات Al2O3 بر خواص پوشش‌های کامپوزیتی Ni-Mo-Al2O3 تولیدی به‌روش رسوب‌دهی الکتریکی

نویسندگان

دانشکده مهندسی مواد، دانشگاه صنعتی شیراز، شیراز

چکیده

در این پژوهش، پوشش‌های کامپوزیتی  Ni-Mo-Al2O3روی زیرلایه فولادی کربن متوسط به‌روش رسوب‌دهی الکتریکی در یک حمام سیتراته شامل ذرات میکرونی  Al2O3تولید شدند. سپس اثر غلظت ذرات در حمام (از گستره صفر تا 30 گرم بر لیتر) بر مورفولوژی، ترکیب شیمیایی، ریزسختی و مقاومت به خوردگی پوشش‌های تولیدی بررسی شد. جهت بررسی ریزساختار، مورفولوژی سطحی و همچنین توزیع ذرات در پوشش‌ها از میکروسکوپ‌های نوری و الکترونی روبشی و آزمون‌ کمی طیف‌سنجی تفکیک انرژی استفاده شد. رفتار خوردگی پوشش‌های تولیدی در محلول 5/3 درصد وزنی نمک طعام بررسی شد. نتایج نشان داد که حضور ذرات اکسید آلومینیوم در پوشش مورفولوژی پوشش‌های Ni-Mo را تغییر می‌دهد و علاوه بر این باعث افزایش سختی و مقاومت به خوردگی پوشش‌های آلیاژی Ni-Mo می‌شود. همچنین مشخص شد که پوشش‌های تولیدی در غلظت ذرات 20 گرم بر لیتر در حمام دارای مورفولوژی مناسب و بدون حفره بوده و نیز دارای بیشترین سختی و مقاومت به خوردگی در بین پوشش‌های تولیدی هستند.

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Al2O3 Particles Concentration on the Properties of Ni-Mo-Al2O3 Composite Coatings Fabricated by Electrodeposition

نویسندگان [English]

  • M. Alizadeh
  • A. Cheshmpish
Department of Materials Science and Engineering, Shiraz University of Technology, Modarres Blvd, Shiraz, Iran.
چکیده [English]

In this research, Ni-Mo-Al2O3 composite coatings were electro-deposited on the mild carbon steel in a citrate bath containing micro- sized Al2O3 particles. Afterward, the effect of the particle concentration in the electrolyte bath (ranging from 0 g/L to 30 g/L) on the microstructure, microhardness, and corrosion performance was evaluated. To investigate the microstructural changes and the surface morphology of the coatings, as well as the particle distribution in the deposits, optical and scanning electron microscopy coupled with the energy dispersive X-ray spectroscopy was utilized. The corrosion behavior of the prepared coatings was investigated in a 3.5 wt. % NaCl solution. The results showed that the presence of the Al2O3 particles in the Ni-Mo coatings changed the  microstructure and also, increased the  microhardness and corrosion resistance of them. It was also found that the desirable structure of the protruding crystallite morphology with no detectable pores could  be achieved at the medium concentrations of reinforcement (e.g. 20 g/L). Further the optimum concentration of the particles in the electrolyte bath to attain the composite coating with the desirable microstructure and consequently, the desirable corrosion resistance was found to be 20 g/L.

کلیدواژه‌ها [English]

  • Ni-Mo-Al2O3 composite coatings
  • electrodeposition
  • morphology
  • Microhardness
  • corrosion resistance

مراجع

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مواد پیشرفته در مهندسی
دوره 37، شماره 2
شهریور 1397
صفحه 49-58

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