بررسی خوردگی حفره‌ای فولاد زنگ نزن مارتنزیتی 403 در محیط حاوی یون‌های برماید و یداید

نوع مقاله : علمی و پژوهشی

نویسندگان

سهراب پهلوان

کیوان صفار

ایمان تاجی

محمد هادی موید

سحر ملازاده بیدختی

دانشگاه فردوسی مشهد

10.22067/ma.v0i29.47398

چکیده

در مطالعه‌ی حاضر، با استفاده از روش‌های پتانسیودینامیک و پتانسیواستاتیک، رفتار خوردگی حفره‌ای فولاد زنگ‌نزن مارتنزیتی 403 در محلول‌های NaBr و NaI مورد بررسی قرار گرفته است. مشاهدات نشان داد که یون‌های هالید اثری دوسویه بر خوردگی حفره‌ای دارند. یون برماید به دلیل شعاع یونی کوچک‌تر در مرحله‌ی جوانه‌زنی حفرات ناپایدار مخرب‌تر ظاهر می‌شود به طوری که فرکانس وقوع حفرات ناپایدار بیش‌تری دارد. از طرفی یون یداید به دلیل پایین‌تر بودن اسیدیته‌ی HI در مرحله‌ی رشد و گسترش حفرات ناپایدار اثر بیش‌تری خواهد داشت. اما روی هم رفته یون برماید مخرب‌تر بوده و پتانسیل حفره‌دار شدن در محلول حاوی یون برماید پایین‌تر است.

کلیدواژه‌ها

خوردگی حفره‌ای

یداید

برماید

حفرات ناپایدار

فولاد زنگ نزن مارتنزیتی

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عنوان مقاله English

Investigation of the Pitting Corrosion Behavior of 403 Martensitic Stainless Steel in Bromide and Iodide Solutions

نویسندگان English

sohrab pahlavan

Keivan Saffar

Iman Taji

Mohammad hadi Moayed

Sahar Mollazadeh Beidokhti

Ferdowsi University of Mashhad.

چکیده English

In this study, the pitting corrosion behavior of 403 martensitic stainless steel was investigated in NaBr and NaI solutions, by using potentiodynamic and potentiostatic techniques. The observations showed that halide ions have a bilinear effect on the pitting corrosion. The bromide ion due to its smaller ionic radius is more active in the initiation step of metastable pits, so that it increases the frequency of occurrence of metastable pits. On the other hand, the iodide ion has a greater effect on the propagation step, due to the low acidity of HI. Altogether, the bromide ion is more aggressive than iodide and has a lower pitting potential.

کلیدواژه‌ها English

Pitting Corrosion

Iodide

Bromide

Metastable pits

Martensitic stainless steel

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