بررسی افزودن متیونین بر خوردگی فولاد L316 تولیدشده به روش SLM در محیط اسیدسولفوریک

نویسندگان

دانشگاه شهید چمران اهواز، دانشکده مهندسی، گروه مهندسی مواد

چکیده

در این پژوهش، افزودن بازدارنده آلی متیونین (به‌عنوان بازدارنده دوست‌دار محیط زیست) به محیط 0/1 مولار اسیدسولفوریک برای فولاد زنگ‌نزن آستنیتی L316 (ساخته شده به روش نوردی و روش چاپ سه‌بعدی)، باعث بهبود مقاومت به خوردگی شده است. برای بررسی این تأثیرات از آزمون‌های الکتروشیمیایی پتانسیل مدار باز و امپدانس و آزمون‌های ساختاری همچون میکروسکوپ نوری و الکترونی و طیف‌سنجی فوتوالکترون پرتوی ایکس استفاده شد. مقاومت به خوردگی در حضور بازدارنده بیشتر از نمونه بدون بازدارنده بوده و بازده بازدارندگی متیونین تا 64 درصد و مقاومت انتقال سطحی تا 2/77 برابر افزایش یافت. افزودن متیونین علاوه بر کاهش ناهمواری سطح، باعث کاهش تجمیع حفرات سطحی شده است. مکانیزم جذب شیمیایی و فیزیکی بازدارنده (جذب سمت با بار منفی مولکول متیونین با نواحی آندی سطح فلز با بار مثبت) در همه نقاط سطح نمونه با بازدارنده، رخ داده است. همچنین میزان اکسیژن در حفرات کاهش یافته و توزیع گوگرد در سطح یکنواخت شده است. ضخامت لایه‌های اکسیدی روئین‌کننده در اثر افزودن بازدارنده، بیشتر از نمونه بدون بازدارده محاسبه شد. 

کلیدواژه‌ها


عنوان مقاله [English]

INVESTIGATION OF THE ADDITION OF METHIONINE ON THE CORROSION OF 316L STAINLESS STEEL FABRICATED BY SLM METHOD IN SULFURIC ACID MEDIA

نویسندگان [English]

  • M. H. Rezvani
  • M. Yeganeh
  • S. M. Lari Baghal
Shahid Chamran University of Ahvaz, Department of Materials Engineering
چکیده [English]

In this study, the addition of organic methionine inhibitor (as an eco-friendly inhibitor) to 0.1 M sulfuric acid media on corrosion resistance of 316L austenitic stainless steel (fabricated by rolling method and three-dimensional (3D) printing method) was investigated. Open-circuit potential electrochemical test and impedance, and structural tests such as optical and electron microscopy and x-ray photoelectron spectroscopy were conducted. The results showed that the corrosion resistance in the presence of inhibitor was higher than the sample without inhibitor and the inhibitory efficiency of methionine was increased up to 64% and the resistance to surface transfer between metal oxide and electrolyte was improved up to 2.77 times. The addition of methionine reduced the surface roughness and accumulation of the surface cavities. The chemical and physical adsorption mechanism of the inhibitor (negatively charged side adsorption of the methionine molecule with positively charged anodic regions of the metal surface) occurred at all points on the surface of the sample with the inhibitor. Also, the amount of oxygen in the cavities was reduced and the distribution of sulfur was uniform. The thickness of the passivator oxide layers was calculated more than the sample without inhibition due to the addition of inhibitor.

کلیدواژه‌ها [English]

  • 316L Stainless Steel
  • Selective Laser Melting
  • Methionine Inhibitor
  • Corrosion
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