اثر گونۀ باکتری بی‌هوازی کلستریدیوم بر رفتار خوردگی خط لولۀ فولاد میکروآلیاژ API X42 در محلول شبیه‌سازی شدۀ خاک شور

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، مهندسی مواد، گرایش شناسایی و انتخاب مواد، دانشگاه شهید چمران اهواز، اهواز، ایران.

2 دانشیار، مهندسی مواد، گروه مهندسی مواد، دانشکده مهندسی، دانشگاه شهید چمران اهواز، اهواز، ایران.

3 استاد، میکروبیولوژی، گروه زیست‌شناسی، دانشکده علوم، دانشگاه شهید چمران اهواز، اهواز، ایران.

چکیده

در این پژوهش، اثر گونۀ باکتریایی کلستردیدیوم به عنوان یک باکتری بی­هوازی احیا کننده سولفات بر رفتار خوردگی فولاد میکروآلیاژ X42 در محلول شبیه­سازی شده خاک شور آزمایشگاهی طی بازه­های زمانی 3 روز تا 40 روز تحت شرایط تلقیح شده با باکتری مورد ارزیابی قرار گرفت. به این منظور، از یک نمونه خاک حاوی لجن به عنوان منبع تولید باکتری و از یک نمونه خاک شور به عنوان مبنای آنالیز اولیه جهت تولید محلول شبیه­سازی شدۀ خاک شور استفاده شد. رفتار خوردگی و ریزساختار محصولات خوردگی به صورت تابعی از زمان ماندگاری مورد ارزیابی قرار گرفت.بررسی­های ریزساختاری نشانگر تجمع باکتری­ها بر سطح فولاد بعد از 7 روز است. با افزایش زمان ماند تا زمان میانی (21 تا 24 روز)، بیوفیلمی متراکم از مواد پلیمری برون سلولی شکل گرفت. اما پس از آن، بیوفیلم با ظاهری پوسته­ای شکل ظاهر شد که نشان از فررویختن بیوفیلم است. این تغییرات ریزساختاری توام با تغییرات چشمگیر در مقاومت خوردگی بود. مقاومت خوردگی ابتدا به دلیل فعالیت باکتری­های احیا کنندۀ سولفات  از .cm2 ­Ω1019در 3 روز به.cm2 ­Ω274 در 7 روز کاهش یافت. این افزایش سرعت خوردگی، زمینۀ ایجاد بیوفیلم متراکم در دورۀ زمانی میانی را فراهم کرد؛ به نحویکه مقاومت خوردگی به .cm2 ­Ω 7330 در زمان ماندگاری 21 روز افزایش یافت.اما بیوفیلم متراکم محافظ، ناپایدار بوده و به سرعت فرو پاشیدکه در اثر آن مقاومت خوردگی مجدداً کاهش و به مقدار .cm2 ­Ω 480 در زمان ماندگاری 40 روز رسید.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of Anaerobic Bacterium Clostridium sp. on the Corrosion Behavior of the API X42MicroalloyedPipeline Steel in Saline Simulated Soil Solution

نویسندگان [English]

  • mojtaba baghalzadeh 1
  • Khalilollah Gheisari 2
  • Hossien H. Motamedi 3
1 MSc student, Department of Materials Science and Engineering, Faculty of Engineering,, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
2 Associate Professor, Department of Materials Science and Engineering, Faculty of Engineering, , Shahid Chamran University of Ahvaz, Ahvaz, Iran.
3 Professor, Department of Biology, Faculty of Science,, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
چکیده [English]

In this study, the effect of bacterium clostridium sp. as ananaerobic sulfate-reducing bacteria on the corrosion behavior ofAPI X42 micro-alloyed pipeline steel was evaluated in a saline simulated soil solution at different immersion times (varying from 3 days to 40 days) under biotic condition. In this process, a soil sample containing sludge was used as a source of production sulfate-reducing bacteria and a saline soil sample was used as the basis of the saline simulated soil solution. The corrosion behavior and microstructure of the corrosion products were evaluated as a function of immersion time. Microstructural examinations show the accumulation of bacteria on the steel surface after 7 days. By further immersed times to the middle times (21-24 days), a biofilm comprised of the dense extracellular polymeric substances was formed. After that, biofilm exfoliation was observed showing physical biofilm breakdown. This microstructural variation is associated with aremarkable variation in corrosion resistance. At first, the corrosion resistance decreases sharply from 1019Ω.cm2at 3 days to 274Ω.cm2at 7 days due to the metabolic bacterial activity. As a result of this high corrosion rate, a densely packed biofilm was formed at the middle times in such a way that corrosion resistance rises sharply to 7330Ω.cm2at 21 days. However, the dense protective biofilm formed at the surface was unstable and biofilm was degraded rapidly; consequently, the corrosion resistance decreases to 480 Ω.cm2at 40 days.

کلیدواژه‌ها [English]

  • Sulfate-reducing bacterium clostridium sp
  • X42 microalloyed steel
  • Biofilm
  • Electrochemical impedance spectroscopy

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سابقه مقاله

  • تاریخ دریافت: 29 اسفند 1399
  • تاریخ بازنگری: 15 آبان 1400
  • تاریخ پذیرش: 17 اسفند 1400

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