APWLAdvanced Power Line
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Average percent weight loss (APWL), ranged from 4.09-6.69% for the wet controls and 0.81 to 6.66 % for controls supplied with nutrient broth during first through last observational points (Table I, Figs.
Maximum APWL (39.58%) was obtained for the coupons exposed to B.
Table I.- Corrosion rate in mg dm-2d-1 and average percent weight loss (APWL) of mild steel coupons buried in wet and nutrient broth impregnated soils treated with Bacillus cereus-SNB-4, Bacillus thuringiensis-SN8, and their co-culture for different periods of time.
When APWL of respective control coupons were subtracted from the experimental MSCs, to depict effects of MIC, it appeared that exposures to the B.
In the present experiments provision of nutrient broth, besides enhancing the bacterial growth, invariably resulted into lesser corrosion rates as well as % APWL for the soil buried MSCs.
And sparsely distributed microbial cells/ clusters, might have caused generation of gradient in electrochemical activity and then accelerated the corrosion processes as became evident by 18 folds higher % APWL in such cases as compared to nutrient broth supplemented soil experiments.
Average percent weight loss (APWL) of the three months exposed MSC was found to be 3.13 and 2.93% for B.
The APWL of these experimental coupons also showed a comparable trend.
However, significant decreases in APWL of MSC exposed to corrosive bacteria together with antagonists' products as compared to MSCs exposed to un-inoculated control and corrosive bacteria are suggestive to speculate involvement of comparable protective shielding effects of antagonist bacteria for the MIC.