Corrosion of Mild Steel Simulating Long Term Soil Burial Field Conditions Differing in Nutritional and Biotic Components
نویسندگان
چکیده
Mild steel coupons (MSCs) buried for thirty months in soils inoculated with bacterial isolate Bacillus cereus-SNB4 resulted in microbiologically influenced corrosion (MIC) based average percent weight loss (APWL) and corrosion rate (CR) as 8.21% and 3.55mgdm d , respectively with 18.86% moisture and 2 1 0.218% organic contents. For nutrient added soils the corresponding figures were -8.95 and -3.87 with 13.53% moisture and 0.239% organic contents. The CR and APWL of MSCs due to MIC, treated with Bacillus thuringiensis-SN8 were 6.14mgdm d and 14.19%, respectively with 17.65% moisture and 0.228% organic 2 1 contents. For nutrient added soils, the respective values were -1.68 and -3.9 with 15.74% moisture and 0.19% organic contents. Corrosion rate and APWL of MSCs due to MIC in the co-cultured (inoculated with Bacillus cereus-SNB4 + Bacillus thuringiensis-SN8) soils without added nutrients were 0.7mgdm d and 1.61%, 2 1 respectively with 12.65% moisture and 0.206% organic contents. For co-cultured nutrient added soils, CR and APWL due to MIC were -3.18mgdm d and -7.35%, respectively with 16.85% moisture and 0.272% organic 2 1 contents. X-rays diffraction (XRD) analysis of corrosion products expressed peaks of higher intensities of Fe(OH) , -Fe O .3H O and -FeOOH. 3 2 3 2
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