مطالعه سختی، ریز ساختار و رفتار سایشی پوششهای آلیاژی روی- نیکل

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استاد، دانشکده مهندسی متالورژی و مواد، دانشگاه تهران

2 فارغ التحصیل ارشد/ دانشکده مهندسی متالورژی و مواد، پردیس دانشکده‌های فنی دانشگاه تهران

چکیده

در این پژوهش پوشش‌های آلیاژی Zn-Ni از طریق حمام سولفاتی اسیدی رسوب گذاری الکتریکی شده و سختی، ساختار فازی و رفتار سایشی آنها مورد مطالعه قرار گرفت. به جهت بررسی ساختار فازی از دستگاه پراش اشعه ایکس (XRD) استفاده شد. به منظور بررسی رفتار سایشی، آزمون سایش به روش پین روی دیسک روی نمونه‌ها انجام گرفت. همچنین سختی‌سنجی نمونه‌ها توسط دستگاه اندازه‌گیری میکروسختی ویکرز از سطح نمونه‌ها انجام شد. تصاویر برگشتی و ثانویه از مسیر سایش در پوشش‌ها توسط میکروسکوپ الکترونی روبشی (SEM) و ترکیب شیمیایی آنها توسط آنالیزور (EDX) بررسی شد. نتایج حاکی از آن است که مقدار نیکل تأثیر زیادی بر سختی پوشش‌های آلیاژی Zn-Ni دارد به طوریکه با افزایش مقدار نیکل سختی پوشش‌ها افزایش می‌یابد. همچنین پوشش Zn-14%Ni دارای تک فاز Ni5Zn21 - مکعبی مرکز دار بوده است که این پوشش کمترین ضریب اصطکاک و نرخ سایش را در بین تمامی پوشش‌ها با ترکیب شیمیایی دیگر دارا است.

کلیدواژه‌ها


عنوان مقاله [English]

Study on micro structure and wear behavior of Zn–Ni alloy coatings

نویسندگان [English]

  • Saeed Reza Allahkaram 1
  • Mahshid Tafreshi 2
1 Professor, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran
2 MSc School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran
چکیده [English]

Zn–Ni alloy coatings were electrodeposited from an acidic sulfate bath, while their microstructures, corrosion properties and wear behavior were investigated. To study their structures, X-ray diffraction (XRD) was used. To evaluate the wear behavior, wear tests via pin-on-disc were performed. Hardness measurements were carried out via Vickers microhardness testing machine. Secondary and backscattered electron micrographs were taken from the worn surfaces and chemical compositions of the coatings were also investigated using Scanning Electron Microscope (SEM) equipped with Energy Dispersive Spectroscopy (EDS) analyzer. X-ray diffraction (XRD) technique was also used to determine the phase structures of the coatings. The results indicated that the amount of nickel in the coating had a strong impact on their properties so that by increasing the amount of nickel an increase in the coating hardness was obtained. Finally, Zn-14% Ni coating which contained a single phase -Ni5Zn21 face centered cubic had the lowest coefficient of friction as well as wear rate among all other coatings with different chemical compositions.

کلیدواژه‌ها [English]

  • Zn–Ni alloy
  • Electrodeposition
  • Hardness
  • Microstructure
  • Wear
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