اثر باکتری‌ احیاکنندۀ سولفات بر رفتار خوردگی فولادHSLA-X70 در محیط کشت باکتری

نوع مقاله: مقاله پژوهشی

نویسندگان

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

2 استادیار، مهندسی مواد، گروه مهندسی مواد، دانشکده مهندسی، دانشگاه شهید چمران اهواز،

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

چکیده

در این پژوهش، خوردگی ناشی از عوامل میکروبیولوژیک در اثر متابولیسم باکتری‌های احیا کننده سولفات (SRB) توسط رفتار الکتروشیمیایی و پدیده‌های سطحی مورد ارزیابی قرارگرفته است. نتایج حاصل از طیف‌نگاری امپدانس الکتروشیمیایی نشان می‌دهد که SRB با تغییر محیط کشت باکتری در طی یک ساعت اولیه تماس نمونه با محلول حاوی باکتری، منجر به افزایش مقاومت به خوردگی فولاد HSLA-X70از .cm2Ω 235 به .cm2Ω1651 می‌گردد. تصاویر ریزساختاری مربوط به نمونه قرار گرفته شده در محیط کشت فاقد باکتری، محصولات خوردگی را به صورت گسترده در مقایسه با نمونه قرارگرفته شده در محیط کشت حاوی باکتری نشان می‌دهد که سازگار با نتایج آزمون‌های الکتروشیمیایی است. در عوض، نمونه قرار گرفته در تماس با SRB با جوانه‌زنی کلنی‌های باکتری بر روی سطح همراه شده که گرچه با قلیایی نمودن محیط کشت آهنگ خوردگی یکنواخت را کاهش داده اما مکان‌های مستعد حفره‌زنی در زیر کلنی‌ها را فراهم نموده است. نتایج حاصل از آزمون پلاریزاسیون چرخه‌ای حساسیت به خوردگی حفر‌ه‌ای برای نمونه قرارگرفته در محلول حاوی باکتری را تایید می-نماید.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Sulfate Reducing Bacteria on the Corrosion Behavior of the HSLA X70 Steel in Bacteria Culture Medium

نویسندگان [English]

  • zahra shahryari 1
  • Khalilollah Gheisari 2
  • hossien motamedi 3
1 MSc, Department of Materials Science and Engineering, Shahid Chamran University of Ahvaz,
2 Assistant Professor, Department of Materials Science and Engineering, Shahid Chamran University of Ahvaz,
3 Professor, Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz,
چکیده [English]

In this study, microbiologically influenced corrosion because of metabolite sulfate reducing bacteria (SRB) has been investigated in terms of its electrochemical behavior and surface phenomena. According to the results of electrochemical impedance spectroscopy, SRB through changing the bacteria culture medium during the first hour that sample was contacted to the bacteria solution, leads to an increase in corrosion resistance of HSLA X70 steels from 235 to 1651Ω.cm2. Microstructural examinations on the sample surface embedded in culture medium without bacteria, in comparison to the sample exposed to the culture medium with bacteria, indicate that corrosion products disperse widely which is consistent with the electrochemical tests results. On the contrary, sample exposed to the SRB included bacterial colonies, although shows a reduction in the uniform corrosion rate via the alkalization of the culture medium, provides sites under colonies which are prone to the pitting corrosion. The results of the cyclic polarization test confirm the susceptibility to pitting corrosion of the sample in the bacteria containing solution.

کلیدواژه‌ها [English]

  • sulfate reducing bacteria
  • microalloyed X70 steel
  • cyclic polarization
  • electrochemical impedance spectroscopy
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