اثر افزودنی‌های اتیلن‌گلیکول و دی‌اتیلن‌گلیکول بر کیفیت پوشش نیکل بر روی استیل 316 به روش رسوب‌دهی الکترولیتی

نوع مقاله : مقاله علمی پژوهشی

نویسندگان

مجتمع دانشگاهی علوم کاربردی، دانشگاه صنعتی مالک اشتر، شاهین شهر، اصفهان

چکیده

کیفیت پوشش نیکل در فرایند پوشش‌دهی الکترولیتی شامل میزان براقیت و ضخامت پوشش، به ترکیبات شیمیایی وان و به ویژه نوع و مقدار افزودنی‌ها وابسته می‌باشد. در این تحقیق، شرایط وان واتس در حضور اتیلن گلیکول و یا دی‌اتیلن گلیکول به عنوان افزودنی، بر کیفیت پوشش نیکل بر روی بستر استیل مورد مطالعه قرار گرفته است. جهت بهینه نمودن شرایط، از روش یک متغیر در یک زمان استفاده شد. با استفاده از تصویربرداری توسط گوشی هوشمند و پردازش تصویر در نرم‌افزار متلب، میزان براقیت پوشش نیکل تعیین شده و ضخامت پوشش توسط دستگاه ضخامت سنج، اندازه‌گیری شد. در شرایط بهینه 120 گرم بر لیتر دی اتیلن‌گلیکول و یا 50 گرم بر لیتر اتیلن‌گلیکول، pH برابر با 5/4، زمان 20 دقیقه، دمای 45 درجه سانتی‌گراد و چگالی جریان 6 آمپر بر دسی‌متر مربع، درصد براقیت 94% با ضخامت 18 میکرومتر برای پوشش نیکل بدست آمد. به منظور مطالعه مورفولوژی سطح و آنالیز عناصر پوشش، از تصاویر میکروسکوپ الکترونی روبشی ( SEM ) همراه با طیف‌بینی پاشندگی انرژی (EDS ) استفاده شد. نتایج حاصله، توزیع یکنواخت پوشش نیکل همراه با خلوص 100% بر روی بستر را نشان داد. نتایج طیف‌سنجی پراش اشعه ایکس ( XRD ) نیز نشان داد که پوشش نیکل، دارای ساختار بلوری fcc می‌باشد. نتایج منحنی‌های پلاریزاسیون حاکی از 83% کاهش سرعت خوردگی استیل با پوشش نیکل در محلول 5/3% وزنی سدیم کلرید در مقایسه با استیل بدون پوشش می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The effect of ethylene glycol and diethylene glycol additives on the quality of nickel coating on stainless steel substrate by electrodeposition method

نویسندگان [English]

  • Hamid Reza Pouretedal
  • Afsaneh Azimi
  • Saeed Mahbob
Faculty of Applied Sciences, Malek-ashtar University of Technology
چکیده [English]

The additives have a great effect on the quality of the nickel coating including brightness and thickness in the process of electrodeposition. In this research, Watts nickel bath conditions are studied in the presence of ethylene glycol and or diethylene glycol as an additive on the quality of nickel coating on stainless steel substrate. The method of one variable at a time is used to optimize the conditions. The brightness of the nickel coating is investigated using smartphone imaging and image processing in MATLAB software and also the thickness of the coating are measured by a thickness gauge. A nickel coating with brightness 94% and thickness of 18 micrometers is obtained in optimized conditions including 120 g/L of diethylene glycol and or 50 g/L of ethylene glycol, pH 4.5, time 20 min., temperature 45 oC and current density 6 A/dm2. The technique of scanning electron microscope energy diffraction spectroscopy (SEMEDS) is used to study the surface morphology and analysis of coating elements. The obtained results showed the uniform distribution of nickel coating with 100% purity. The results of X-ray diffraction (XRD) also showed that the nickel coating has an fcc crystal structure. The results of the polarization curves indicated an 83% reduction in the corrosion rate of the nickel coating in the NaCl medium.

کلیدواژه‌ها [English]

  • Watts bath
  • nickel coating
  • ethylene glycol
  • diethylene glycol
  • electrodeposition

This is an open access article under the CC-BY-SA 4.0 license.( https://creativecommons.org/licenses/by-sa/4.0/)

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