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

نوع مقاله : مقاله پژوهشی

نویسندگان

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

چکیده

مقدمه و اهداف: خواص پوشش‌های حاصل از پاشش سرد به متغیرهای فرایند وابسته است. هدف از این پژوهش، بررسی اثر فشار گاز و فاصله پاشش در فرایند پاشش سرد فلز روی بر بستر فولاد کم‌کربن است. 
مواد و روش‌ها: در این پژوهش، 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.
یافته‌ها: 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 داد که پوشش نسبت به بستر ماهیت فداشونده دارد و چگالی جریان خوردگی را 48 درصد و نرخ خوردگی را 33 درصد نسبت به بستر کاهش می‌دهد.
نتیجه‌گیری: در این پژوهش، تأثیر فشار گاز و فاصله پاشش در فرایند پاشش سرد فلز روی بر بستر فولاد کم‌کربن بررسی شد. نتایج نشان داد که افزایش فشار گاز از 20 به 30 بار و کاهش فاصله پاشش از 30 به 20 میلی‌متر باعث بهبود تخلخل و افزایش ریزسختی پوشش‌ها می‌شود. یافته‌های این تحقیق، می‌تواند در بهینه‌سازی متغیرهای فرایند پاشش سرد فلز روی برای استفاده در صنایع مختلفی مانند خودروسازی، نیروگاهی و زیرساخت‌های دریایی به کار رود.

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]

  • Mohammad Hadi Khanbabaee Saatloo
  • Amir Abdollah-Zadeh
  • Rajab Ali Seraj
Department of Materials Engineering, Faculty of Mining and Materials Engineering, Tarbiat Modares University, Tehran, Iran
چکیده [English]

Introduction and Objectives: The properties of coatings deposited by cold spray depend on the parameters of the process. The aim of this research is to investigate the effect of gas pressure and stand-off distance of cold spray process of zinc on a low carbon steel substrate.
Materials and Methods: In this research, 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 using 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.
Results: The results showed that increasing the gas pressure from 20 to 30 bar decreased the porosity and increased the micro-hardness due to further deformation. Also, for a constant pressure, the stand-off distance of 20 mm has the lowest porosity and the highest micro-hardness due to the higher temperature of the particles when impact 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 by 33% compared to the substrate.
Conclusion: In this study, the effect of gas pressure and stand-off distance of cold spray process of zinc on low carbon steel substrate was investigated. The results showed that increasing the gas pressure from 20 to 30 bar and reducing the stand-off distance from 30 to 20 mm improved porosity and increased coatings micro-hardness. The results of this study can be used to optimize the parameters of the cold spraying of zinc for use in various industries such as automotive, power plants and marine infrastructure.

کلیدواژه‌ها [English]

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

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