علوم و فناوری کامپوزیت

تهیه پوشش سرامیکی نانوکامپوزیتی سیلیکا/تیتانیای اعمالی به روش سل- ژل روی فولاد کربنی و مطالعه خواص آن در برابر یون خورنده موجود در فاضلاب تصفیه شده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، بیومواد، دانشگاه تهران، تهران، ایران

2 استادیار، محیط زیست، دانشگاه تهران، تهران، ایران

3 دانشیار، محیط زیست، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، ایران

4 استادیار، مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

با توجه به کمبود منابع آبی، استفاده از فاضلاب تصفیه شده بعنوان یک راهکار پایدار مد نظر صنایع مختلف بویژه واحدهای خنک کننده صنعتی و دیگ های بخار فعال در صنایع قرار گرفته است. لیکن استفاده از فاضلاب تصفیه شده، مشکلات خاص خود نظیر خوردگی قطعات فلزی که اغلب از فولاد کربنی ساخته شده اند را به همراه دارد. لذا روشهای مختلفی نظیر پوشش دهی توسط بهره برداران صنعتی به منظور کاهش خوردگی مورد استفاده قرار گرفته است. در این پژوهش، پوشش سرامیکی نانو‌کامپوزیتی سیلیکا / تیتانیا به روش سل - ژل تولید و به روش غوطه‌ وری به مدت 100 ثانیه بر روی فولاد کربنی نشانده شد و ساختار و خواص خوردگی پوشش‌های ایجاد شده بررسی گردید. نتایج نشان دادند که پوشش مذکور خواص خوردگی فولاد کربنی را بهبود می دهد. سپس به منظور بهبود خواص و عملکرد پوشش، نسبت‌های مولی اجزای سازنده و فاکتورهای موثر بر عملکرد پوشش بررسی شدند تا پوشش بهینه با ساختار نانویی و بیشترین میزان حفاظت از خوردگی تهیه گردد. جهت بررسی عملکرد حفاظت از خوردگی پوشش‌ها، منحنی‌های پلاریزاسیون و جهت بررسی مورفولوژی سطح، تصویربرداری میکروسکوپ الکترونی به کار گرفته شد. به منظور بررسی نوع پیوندها و گروه‌های عاملی موجود در سل بهینه‌ تهیه شده، از طیف مادون قرمز استفاده گردید. میزان حفاظت از خوردگی پوشش بهینه، در محلول سدیم کلراید 5/3 در‌صد مورد بررسی شد و نتایج حاصل نشان دادند که پوشش بهینه‌ی تهیه شده، حفاظت موثر برای سطح فولاد کربنی در برابر خوردگی در محلول سدیم کلراید 5/3 درصد را فراهم می‌کند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Preparation of SiO2/TiO2 ceramic nano composite coating by sol-gel method on carbon steel and study the properties of it against corrosive ion in treated wastewater

نویسندگان [English]

  • Seyyed Behnam Abdollahi Boraei 1
  • Mehdi Esmaeili-Bidhendi 2
  • Daryoush Afzali 3
  • Ramin Hashemi 4

1 - Department of Life science Engineering, Faculty of New Sciences and Technologies, University of Tehran, Tehran

2 Faculty of Environment, University of Tehran, Iran

3 Department of Chemistry, Graduate University of Advanced Technology, Kerman, Iran

4 School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

چکیده [English]

Nowadays due to water shortage, the use of treated wastewater as sustainable solution has been considered by industrial units; especially in industrial cooling units and boilers. However the use of treated wastewater also has its own problems such as corrosion of metal parts that they are often made of carbon steel. Therefore different methods such as coating have been considered by the industrial user of treated wastewater in order to reduce corrosion. So in this study, SiO2/TiO2 Ceramic Nano composite coatings was put on Carbon Steel plates by Sol-Gel method and by dipping process for 100 seconds and microstructure and properties of produced ceramic coatings were investigated. The results showed that ceramic Nano composite coatings improved corrosion properties of Carbon Steel. In order to improve the properties and performance of the coating, the molar ratio of components and factors affecting performance of coating were evaluated till optimum coating with Nano structure and highest level of corrosion protection is provided. To evaluate the performance of coatings for corrosion protection, polarization curves and to determine the surface morphology, scanning electron microscope was used. In order to study the bonds type and functional groups in the optimal sol, infrared spectrum was used. The optimum corrosion protection coatings were studied in 3.5% sodium chloride solution. The results showed that the ceramic optimal deposited coating provides effective protection for the surface of Carbon Steel against corrosion in 3.5% sodium chloride solution.

کلیدواژه‌ها [English]

  • nano composite
  • Coating
  • Corrosion Protection
  • Sol-gel
  • Polarization Curves
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علوم و فناوری کامپوزیت
دوره 5، شماره 1
خرداد 1397
صفحه 33-40
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