اثر فشار گاز و فاصله پاشش فرایند پاشش سرد بر خواص پوشش‌های فلز روی بر بستر فولادی

مقالات آماده انتشار

نوع مقاله : مقاله پژوهشی

نویسندگان

بخش مهندسی مواد، دانشکده مهندسی معدن و مواد، دانشگاه تربیت مدرس، تهران، ایران

چکیده

هدف از این پژوهش، بررسی اثر فشار گاز و فاصله پاشش فرایند پاشش سرد فلز روی بر بستر فولاد کم کربن است. به همین منظور، ابتدا پودر فلز روی در فشارهای 20 و 30 بار و فواصل پاشش 20 و 30 میلی‌متر پاشش شدند. ریزساختار پوشش‌های ایجادشده با میکروسکوپ‌های نوری و الکترونی روبشی بررسی و ریزسختی پوشش‌ها اندازه‌گیری شد. سپس، پوشش‌ منتخب و بستر فولادی تحت آزمون‌ خوردگی پلاریزاسیون تافل قرار گرفتند. نتایج نشان داد که افزایش فشار گاز از 20 به 30 بار باعث کاهش تخلخل و افزایش ریزسختی ناشی از تغییرشکل بیشتر می‌شود. همچنین در فشار ثابت، فاصله پاشش 20 میلی‌متر، کم‌ترین تخلخل و بیش‌ترین ریزسختی را به دلیل دمای بالاتر ذرات هنگام برخورد به بستر دارد. نتایج به‌دست آمده از آزمون پلاریزاسیون نشان می‌دهد که پوشش نسبت به بستر ماهیت فداشونده دارد و چگالی جریان خوردگی را 48% و نرخ خوردگی را 33% نسبت به بستر کاهش می‌دهد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of Gas Pressure and Stand-Off Distance on the Properties of Cold Sprayed Zinc on Steel Substrate

نویسندگان [English]

  • M.H. Khanbabaee Saatloo
  • َA. Abdollah-zadeh
  • R.A. Seraj
Department of Materials Engineering, Faculty of Mining and Materials Engineering, Tarbiat Modares University, Tehran, Iran
چکیده [English]

The aim of this research is to investigate the effect of gas pressure and stand-off distance of cold spray process of zinc on low carbon steel substrate. For this purpose, zinc powder was sprayed at pressures of 20 and 30 bar and stand-off distances of 20 and 30 mm. The microstructure of the coatings was investigated with optical and scanning electron microscope and the micro-hardness of the coatings was measured. Then, the selected coating and steel substrate were subjected to polarization corrosion test. The results showed that increasing the gas pressure from 20 to 30 bar decreases the porosity and increases the micro-hardness due to further deformation. Also, the stand-off distance of 20 mm has lowest porosity and the highest micro-hardness due to the higher temperature of the particles when impacts the substrate. The results obtained from the polarization test show that the coating has a sacrificial nature compared to the substrate and reduces the corrosion current density by 48% and corrosion rate of 33% compared to the substrate.

کلیدواژه‌ها [English]

  • Cold spray
  • Steel
  • Zinc
  • Porosity
  • Corrosion resistance

مراجع

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مقالات آماده انتشار، پذیرفته شده
انتشار آنلاین از تاریخ 23 دی 1403

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