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

نوع مقاله : علمی و پژوهشی

نویسندگان

دانشگاه فردوسی مشهد

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

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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