کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10628747 | 990406 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pitting corrosion of titanium by a freshwater strain of sulphate reducing bacteria (Desulfovibrio vulgaris)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Pitting corrosion of titanium (ASTM Grade 2) was investigated by exposing coupons (2.0 Ã 1.5 cm) to a semi-continuous culture of sulphate reducing bacteria (SRB) strain Desulfovibrio vulgaris. The coupons were exposed to the SRB culture for 90 days along with a control set in uninoculated medium. During the course of the experiment sulphide was estimated at intervals of 4 days and the concentrations ranged from 0.2 to 0.4 mM in the bulk medium. Epifluorescence microscopy revealed extensive colonization by the SRB and the cell count ranged from 104 to 105 cells cmâ2. Optical microscopy revealed the presence of two types of pits; large hemispherical pits of â¼2 mm diameter and many micropits. Pitting was not observed in control coupons exposed to SRB free medium. SEM and CSLM pictures showed the corroded titanium surface with several micropits, along with typical rod shaped SRB cells in the pitted regions. EDAX analysis revealed peaks for Ti, O, N, C, Fe and P in the pitted region. XPS data showed clear peaks for titanium sulphur (three states) and phosphorous. The study reveals that at room temperature and in the presence of 0.2-0.4 mM of sulphide, as well as the putative phosphine, SRB can promote pitting corrosion of titanium by formation of titanium sulphide.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Corrosion Science - Volume 47, Issue 5, May 2005, Pages 1071-1084
Journal: Corrosion Science - Volume 47, Issue 5, May 2005, Pages 1071-1084
نویسندگان
T.S. Rao, Aruna Jyothi Kora, B. Anupkumar, S.V. Narasimhan, R. Feser,