تأثیر اندازه دانه بر رفتار خوردگی فولاد زنگ‌نزن 304 ال

نویسندگان

دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان

چکیده

در این پژوهش به­ بررسی تاثیر اندازه دانه بر رفتار خوردگی فولاد زنگ­ نزن آستنیتی 304­ال در محلول اسید کلریدریک 1/0 مولار پرداخته شده است. برای این­ کار، ساختارهایی با اندازه دانه ­های 5/0، 3 و 12 میکرومتر از طریق دگرگونی مارتنزیتی با 80 درصد نورد سرد و بازگشت آن به آستنیت با آنیل بازگشتی در دمای 900 درجه سانتیگراد و زمان­ های 1، 5 و 180 دقیقه تولید شد. برای ارزیابی رفتار خوردگی از آزمون ­های الکتروشیمیایی پلاریزاسیون سیکلی و غوطه ­وری استفاده شد. نتایج نشان داد که نمونه ­های با اندازه دانه ­های مختلف نرخ خوردگی یکنواخت یکسانی دارند. با وجود این، بر اساس آزمون ­های پلاریزاسیون سیکلی مشخص شد که با کاهش اندازه دانه، مقاومت در برابرحفره ­دار شدن بهبود یافته است به ­طوری­که پتانسیل حفره ­دار شدن از 290 میلی­ولت برای اندازه دانه 12 میکرومتر به 420 میلی­ولت برای اندازه دانه 5/0 میکرومتر افزایش یافت.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Grain Size on the Corrosion Behavior of 304L Stainless Steel

نویسندگان [English]

  • M. Atapour
  • M.M. Dana
  • F. Ashrafizadeh
چکیده [English]

In this investigation, the effect of grain size on the corrosion behavior of 304L stainless steel has been studied. Samples with grain sizes of 0.5, 3 and 12 micrometers were fabricated through formation of strain-induced martensite by 80% cold rolling of the stainless steel sheets at -15 °C and its reversion to austenite during annealing at 900 °C for 1, 5 and 180 min. The corrosion behavior of samples with different grain sizes was investigated by cyclic polarization experiments and  immersion tests in 0.1 M hydrochloric acid (HCl). The polarisation tests showed no differences in uniform corrosion rates of the samples. The results of the cyclic polarisation and immersion tests showed that decreasing the grain size improved the pitting corrosion resistance from 290 mVAg/Agcl for grain size of 12 micrometers to 420 mVAg/Agcl for grain size of 0.5 micrometers.

کلیدواژه‌ها [English]

  • 304L stainless steel
  • Grain size
  • Local corrosion
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