fa تأثیر دانسیته جریان آبکاری روی ریزساختار و رفتار خوردگی پوشش کامپوزیتی Zn-Co-Al2O3 پوشش‌های سرامیکی Ceramic Coatings پژوهشي Research <p dir="RTL" style="text-align:justify"><span style="font-size:12pt"><span style="line-height:150%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><span lang="AR-SA" style="line-height:150%"><span b="" nazanin="" style="font-family:">در تحقیق حاضر، پوشش‌ کامپوزیتی </span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%">Zn-Co-Al₂O₃</span></span><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> توسط روش آبکاری الکتریکی روی زیرلایه فولادی </span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%">St37</span></span><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> اعمال شد. جهت بررسی اثر دانسیته جریان آبکاری روی مورفولوژی سطح، رفتار خوردگی پوشش و همچنین میزان ذرات آلومینا در پوشش، پوشش‌های مختلفی در دانسیته جریان‌های 15، 20 و</span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%">mA.cm^-2</span></span> <span lang="AR-SA" style="line-height:150%"><span b="" nazanin="" style="font-family:">&nbsp;30 ایجاد شد. جهت بررسی مورفولوژی پوشش از میکروسکوپ الکترونی روبشی (</span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%">SEM</span></span><span lang="AR-SA" style="line-height:150%"><span b="" nazanin="" style="font-family:">) و همچنین جهت بررسی مقاومت به خوردگی نمونه‌های آزمایش (فولاد بدون پوشش و پوشش داده شده) در محلول آبی %</span></span><span dir="LTR" style="line-height:150%">wt</span><span lang="AR-SA" style="line-height:150%"><span b="" nazanin="" style="font-family:"> 5/3 کلرید سدیم از آزمون</span></span><span lang="AR-SA" style="line-height:150%"><span calibri="" style="font-family:">‌</span></span><span lang="AR-SA" style="line-height:150%"><span b="" nazanin="" style="font-family:">های پلاریزاسیون پتانسیودینامیک و طیف</span></span><span dir="LTR" style="line-height:150%">‌</span><span lang="AR-SA" style="line-height:150%"><span b="" nazanin="" style="font-family:">نگاری امپدانس الکتروشیمیایی (</span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%">EIS</span></span><span lang="AR-SA" style="line-height:150%"><span b="" nazanin="" style="font-family:">) استفاده شد. نتایج آنالیز میکروسکوپی نشان داد که با افزایش دانسیته جریان آبکاری، میزان ذرات آلومینا در پوشش کاهش می‌یابد <span style="background:yellow">و همچنین ریزساختار پوشش از خوشه‌ای با دانه‌های بی‌قاعده به چندلایه با دانه‌های بلوری ریز تغییر می‌کند.</span> <span style="background:yellow">نتایج آزمون پلاریزاسیون تافل نشان داد </span></span></span><span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">که </span></span></span><span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="color:black">مقاومت پلاریزاسیون </span></span></span></span><span lang="AR-SA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">نمونه پوشش داده شده در دانسیته </span></span></span><span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="color:black">جریان</span></span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="background:yellow"><span style="line-height:150%">mA.cm^-2</span></span></span> <span lang="AR-SA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">&nbsp;15</span></span></span><span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="color:black"> (</span></span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="background:yellow"><span style="line-height:150%">Ω</span></span></span> <span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">5495</span></span></span><span dir="LTR" style="background:yellow"><span style="line-height:150%"><span style="font-family:Symbol">~</span></span></span><span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">) بالاتر از </span></span></span><span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="color:black">مقاومت پلاریزاسیون نمونه‌های پوشش داده شده در دانسیته جریان </span></span></span></span><span lang="AR-SA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">20 </span></span></span><span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="color:black">(</span></span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="background:yellow"><span style="line-height:150%">Ω</span></span></span> <span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">3778</span></span></span><span dir="LTR" style="background:yellow"><span style="line-height:150%"><span style="font-family:Symbol">~</span></span></span><span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">)</span></span></span> <span lang="AR-SA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">و</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="background:yellow"><span style="line-height:150%">mA.cm^-2</span></span></span> <span lang="AR-SA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">&nbsp;30 </span></span></span><span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="color:black">(</span></span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="background:yellow"><span style="line-height:150%">Ω</span></span></span> <span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">2503</span></span></span><span dir="LTR" style="background:yellow"><span style="line-height:150%"><span style="font-family:Symbol">~</span></span></span><span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">) </span></span></span><span lang="AR-SA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">و همچنین نمونه بدون پوشش </span></span></span><span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="color:black">(</span></span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="background:yellow"><span style="line-height:150%">Ω</span></span></span> <span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">513</span></span></span><span dir="LTR" style="background:yellow"><span style="line-height:150%"><span style="font-family:Symbol">~</span></span></span><span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">) است. این نتایج بیانگر مقاومت به خوردگی بالاتر </span></span></span><span lang="AR-SA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">نمونه پوشش داده شده در دانسیته </span></span></span><span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"><span style="color:black">جریان</span></span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="background:yellow"><span style="line-height:150%">mA.cm^-2</span></span></span> <span lang="AR-SA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">&nbsp;15 </span></span></span><span lang="FA" style="background:yellow"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">نسبت به سایر نمونه‌ها است.</span></span></span></span></span></span></span></span></p> <p style="text-align:justify"><span style="font-size:12pt"><span style="line-height:150%"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><span style="line-height:150%">In the present study, a Zn-Co-Al₂O₃ composite coating was applied on an St37 steel substrate using the electroplating method. To investigate the effect of electroplating current density on surface morphology, corrosion behavior of the coating, and the amount of alumina particles in the coating, various coatings were created at current densities of 15, 20, and 30 mA.cm^-2. Scanning Electron Microscopy (SEM) was used to examine the morphology of the coatings, and Potentiodynamic Polarization and Electrochemical Impedance Spectroscopy (EIS) tests were conducted to evaluate the corrosion resistance of the samples (uncoated steel and coated steel) in a 3.5 %wt NaCl solution. The results of microscopic analysis showed that as the electroplating current density increases, the amount of alumina particles in the coating decreases and the coating microstructure changes from a clustered structure with irregular grains to a multilayer structure with fine crystalline grains. <span style="background:yellow">The Tafel polarization test results indicated that the polarization resistance of the sample coated at the current density of 15 mA.cm^-2 (</span></span><span style="background:yellow"><span style="line-height:150%"><span style="font-family:Symbol">~</span></span></span><span style="background:yellow"><span style="line-height:150%">5495 Ω) was higher than that of the coated samples at 20 (</span></span><span style="background:yellow"><span style="line-height:150%"><span style="font-family:Symbol">~</span></span></span><span style="background:yellow"><span style="line-height:150%">3778 Ω) and 30 mA.cm^-2(</span></span><span style="background:yellow"><span style="line-height:150%"><span style="font-family:Symbol">~</span></span></span><span style="background:yellow"><span style="line-height:150%">2503 Ω), as well as the uncoated sample (</span></span><span style="background:yellow"><span style="line-height:150%"><span style="font-family:Symbol">~</span></span></span><span style="background:yellow"><span style="line-height:150%">513 Ω). These results indicate that the coated sample at a current density of 15 mA.cm^-2 has higher corrosion resistance compared to the other samples.</span></span><span style="line-height:150%"></span></span></span></span></span><br> &nbsp;</p> پوشش کامپوزیتی Zn-Co-Al2O3, دانسیته جریان آبکاری, مقاومت به خوردگی, پلاریزاسیون پتانسیودینامیک, طیف‌نگاری امپدانس الکتروشیمیایی Zn-Co-Al2O3 composite coating, Electroplating current density, Corrosion resistance, Potentiodynamic polarization, Electrochemical impedance spectroscopy 0 0 http://ijcse.ir/browse.php?a_code=A-10-466-10&slc_lang=fa&sid=1 Parisa Zandi پریسا زندی Pa.zandi.73@gmail.com 10031947532846005386 10031947532846005386 No Department of Materials Engineering and Metallurgy, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran بخش مهندسی مواد، دانشکده فنی و مهندسی، دانشگاه شهید باهنر کرمان Hadi Ebrahimifar هادی ابراهیمی فر H.ebrahimifar@kgut.ac.ir 10031947532846005387 10031947532846005387 Yes Department of Materials Engineering, Faculty of Mechanical and Materials Engineering, Graduate University of Advanced Technology, Kerman, Iran بخش مهندسی مواد، دانشکده مهندسی مکانیک و مواد، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته Farhad Mohsenifar فرهاد محسنی فر F.mohseni@bam.ac.ir 10031947532846005388 10031947532846005388 No Mechanical Engineering Department, Faculty of Engineering, Higher Education Complex of Bam, Bam, Kerman, Iran گروه مهندسی مکانیک، دانشکده فنی و مهندسی، مجتمع آموزش عالی بم