بررسی خواص و مقایسه خوردگی و سایش پوشش‌های Zn-Ni و Zn-Ni/P

نویسندگان

1 1- دانشکده مهندسی متالورژی و مواد، پردیس دانشکده‌های فنی دانشگاه تهران

2 2- مرکز تحقیقات مواد پیشرفته، دانشکده مهندسی مواد، دانشگاه صنعتی سهند

چکیده

در این تحقیق پوشش‌های ساده Zn-Ni و کامپوزیتی Zn-Ni/PTFE از حمام‌های سولفاتی رسوب‌گذاری الکتریکی شدند. از آزمون پلاریزاسیون پتانسیودینامیک و طیف‌نگاری امپدانس الکتروشیمیایی (EIS) برای بررسی رفتار خوردگی پوشش‌ها استفاده شد. سختی و رفتار تریبولوژیکی پوشش‌ها به‌ترتیب با استفاده از دستگاه سختی‌سنجی ویکرز و روش پین روی دیسک مورد بررسی قرار گرفتند. به‌منظور بررسی ترکیب و مورفولوژی پوشش‌ها و مسیر سایش از میکروسکوپ الکترونی روبشی (SEM) مجهز به طیف‌نگار پرتو ایکس (EDS) استفاده شد. نتایج آزمون خوردگی حاکی از آن است که دانسیته جریان خوردگی پوشش Zn-Ni حدود 30 درصد پوشش کامپوزیتی است. سختی پوشش ساده نیز با افزودن ذرات پلی تترا فلوئوراتیلن کاهش یافته است. با وجود این کاهش سختی، مقدار تلفات سایشی و ضریب اصطکاک با ورود ذرات پلی تترا فلوئوراتیلن حدوداً نصف می‌شود. همچنین مکانیزم سایش در پوشش کامپوزیتی از نوع خراشان خفیف بوده ولی در پوشش فاقد ذرات تغییر فرم پلاستیک و سایش چسبان مکانیزم اصلی سایش هستند. مقدار تلفات سایشی و ضریب اصطکاک در این پوشش به‌ترتیب حدود 43 و 57 درصد کمتر از پوشش ساده است.

کلیدواژه‌ها

عنوان مقاله [English]

A Comparative Investigation into Corrosion and Wear Properties of Zn-Ni and Zn-Ni/PTFE Coatings

نویسندگان [English]

  • M. Tafreshi 1
  • S. R. Allahkaram 1
  • S. Mahdavi 2
1 1. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran.
2 2. Research Center for Advanced Materials, Faculty of Materials Engineering, Sahand University of Technology, Tabriz, Iran.
چکیده [English]

In this research, Zn-Ni and Zn-Ni/PTFE coatings were electrodeposited from sulfate-based electrolytes. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques were used to investigate the  corrosion properties of the coatings. Hardness and tribological behavior of the coatings were examined by the Vickers microhardness testing machine and the  pin-on-disc method, respectively. Chemical composition and morphology of the as-deposited and worn surfaces of the coatings were studied by a scanning electron microscope (SEM) equipped with an energy dispersive X-ray spectrometer (EDS). According to the results,  the corrosion current density of the  Zn-Ni film was about 30% of that of the composite coating. Hardness of the alloy film was partially decreased by the  incorporation of Polytetrafluoroethylene (PTFE) particles. However, the wear loss and coefficient of friction of the  Zn-Ni/PTFE coating were, respectively, about 43% and 57% of those of the Zn-Ni film. Moreover, wear mechanism was changed from plastic deformation and adhesive wear to slight abrasion by  the co-deposition of PTFE particles.

کلیدواژه‌ها [English]

  • electrodeposition
  • Zn-Ni
  • Zn-Ni/PTFE
  • Corrosion
  • Tribology
  • Solid lubricant

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مواد پیشرفته در مهندسی
دوره 37، شماره 3
آذر 1397
صفحه 49-62

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