مطالعه تأثیر حساس‌شدن بر رفتارخوردگی فولاد زنگ‌نزن دوپلکس SAF 2205 در ناحیه ترانس‌پسیو
الموضوعات :
خشایار مرشدبهبهانی
1
(دانشگاه شیراز)
پوریا نجفی سیار
2
(دانشگاه شیراز)
محمود پاکشیر
3
(دانشگاه شیراز)
الکلمات المفتاحية: فولاد زنگ‌نزن دوپلکس SAF 2205, خوردگی بین‌دانه‌ای, امپدانس الکتروشیمیایی,
ملخص المقالة :
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.
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