شیمى کاربردى روز

شیمى کاربردى روز

بررسی مقاومت به خوردگی فولاد پوشش داده شده با نانوکامپوزیتهای نیکل-تنگستن-فسفر تهیه شده به روش الکترولس

نوع مقاله : مقاله علمی پژوهشی

نویسندگان
دانشکده شیمی، دانشگاه سمنان، سمنان، ایران
چکیده
در پژوهش حاضر پوشش های نانو کامپوزیتی نیکل-تنگستن-فسفر به روش الکترولس روی فولاد تهیه شدند. مورفولوژی سطح و ترکیب پوشش ها با میکروسکوپ الکترونی روبشی (SEM) همراه با طیف سنج پراکندگی انرژی پرتو ایکس (EDX) و ساختار بلوری پوشش ها توسط پراش سنج اشعه ایکس (XRD) آنالیز شد. خوردگی فولاد در حضور این پوشش ها در محلول سدیم کلراید 5/3 درصد توسط روش های پلاریزاسیون تافل و طیف سنجی امپدانس الکتروشیمیایی مورد بررسی قرار گرفت و پارامترهای خوردگی شامل پتانسیل خوردگی، دانسیته جریان خوردگی و مقاومت خوردگی بدست آمد. همچنین پارامترهای تاثیرگذار بر روی خواص این پوشش ها مانند pH، دما، و مقدار سدیم تنگستات موجود در حمام الکترولس، مورد بررسی قرار گرفت. بر این اساس مقدار بهینه ی پارامترها بصورت 8=pH، دمای 95 درجه سلسیوس و مقدار سدیم تنگستات 16 گرم بر لیتر تعیین شد. آنالیزهای خوردگی نشان داد که حضور تنگستن در پوشش کامپوزیتی Ni-P تا حد زیادی خواص خوردگی را بهبود می بخشد و باعث افزایش مقاومت خوردگی می شود. بالاترین راندمان بازدارندگی برای پوشش Ni-P وNi-W-P با استفاده از روش پلاریزاسیون تافل به ترتیب 4/37 و 6/80 درصد بدست آمد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Investigating the corrosion resistance of coated steel with Ni-W-P nanocomposites prepared by electroless method

نویسندگان English

Sima Rashid
Ali Arab
Soheila Faraji
Department of Chemistry, Semnan University, Semnan, Iran
چکیده English

In the present study, Ni-W-P nanocomposite coatings were prepared by electroless method. The surface morphology and composition of the coatings were analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) while the crystal structure of the coatings was analyzed by X-ray diffraction (XRD). The corrosion of these coatings in 3.5% sodium chloride solution was investigated by Tafel polarization and electrochemical impedance spectroscopy methods, and the corrosion parameters including corrosion potential, corrosion current density, and corrosion resistance were obtained. Also, the parameters affecting the properties of these coatings such as pH, temperature, and the amount of sodium tungstate in the electroless bath were investigated. Accordingly, the optimal value of the parameters was determined as pH=8, temperature 95 oC, and sodium tungstate content of 16 g/l. Corrosion analyses showed that the presence of tungsten in the Ni-P composite coating greatly improves the corrosion properties and increases corrosion resistance. The highest inhibition efficiency for Ni-P and Ni-W-P coatings using the Tafel polarization method was obtained 37.4% and 80.6%, respectively.

کلیدواژه‌ها English

Electroless
Nanocomposite Coating
Ni-W-P
Corrosion
Steel
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