مطالعه تأثیر حساس‌شدن بر رفتارخوردگی فولاد زنگ‌نزن دوپلکس SAF 2205 در ناحیه ترانس‌پسیو
محورهای موضوعی : خوردگی و حفاظت مواد
خشایار مرشدبهبهانی
1
(دانشگاه شیراز)
پوریا نجفی سیار
2
(دانشگاه شیراز)
محمود پاکشیر
3
(دانشگاه شیراز)
کلید واژه: فولاد زنگ‌نزن دوپلکس SAF 2205, خوردگی بین‌دانه‌ای, امپدانس الکتروشیمیایی,
چکیده مقاله :
در این پژوهش، رفتار خوردگی بین دانه‌ای فولاد زنگ‌نزن دوپلکس SAF 2205 در محلول "2 مولار اسید سولفوریک + 1 مولار اسید کلریدریک" در دمای oC 30 با استفاده از آزمون‌های پلاریزاسیون پتانسیودینامیک، راکتیواسیون پتانسیوکینتیک الکتروشیمیایی دو حلقه‌ای (DLEPR)، تفرق اشعه‌ایکس و طیف‌سنجی امپدانس الکتروشیمیایی (EIS) مورد بررسی قرار گرفت. طیف‌سنجی امپدانس الکتروشیمیایی، برای نمونه‌هایی با درجات مختلفی از حساس شدن به مدت 1 و 5 ساعت در دمای oC 725، وجود سه رفتار متفاوت را در پتانسیل های مختلف ناحیه ترانس پسیو نشان داد. نتایج بررسی حاکی از کاهش مقاومت انتقال بار (Rct) و مقاومت پلاریزاسیون (RP) در اثر افزایش زمان حساس‌شدن می‌باشد و این نتایج با تصاویر میکروسکوپ نوری و الکترونی از سطح نمونه‌های خورده‌شده همخوانی دارد.
In this study, intergranular corrosion (IGC) behaviour of SAF 2205 duplex stainless steels (DSS) was investigated in the "2M H2SO4 + 1M HCl" solution at 30 ◦C using potentiodynamic polarization, DLEPR, X-ray diffraction, electrochemical impedance spectroscopy (EIS) and cyclic polarization tests. The EIS test results of the specimens, with various degrees of sensitization for 1 h and 5 h at 725 oC, shows three different responses in the trans passive region depending on the applied DC bias. Moreover, the results indicate that the charge transfer and polarization resistance (Rct and RP) of the sensitized DSS specimens decrease as a result of increasing the sensitization time which is in accordance with the optical and SEM micrographs from the corroded samples surfaces.
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