By J. M. Pimbley

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Copyright by ASTM Int'l (all rights reserved); Sat Oct 22 03:09:47 EDT 2011 Downloaded/printed by MIT Libraries pursuant to License Agreement. No further reproductions authorized. 40 UNDERGROUND CORROSION OKWMM GONCBiBMIION O U Oi •(QM), FIG. 7—Oxygen concentration cell formed underneath tubercles. Experimental Observations In the remainder of this paper some of the observations which were noted during a study of this proposed mechanism [70] will be discussed. To set up a model, based on the cathodic depolarization theory, I inserted two electrodes (1010 mild steel) in a Petri dish cover (Figs.

33-52. ABSTRACT: Anaerobic corrosion of iron occurs throughout the world and, from an economic standpoint, is quite costly. Sulfate-reducing bacteria, primarily of the genus Desulfovibrio, are responsible for this type of corrosion. It has been postulated that corrosion by these bacteria is caused by their removal of hydrogen from the surface of iron causing it to go into solution. Evidence is presented which indicates that this mechanism may not be responsible for the main corrosive effect of these organisms.

3048 m. often observed in rocky and mountainous regions. Personal observations in Western Pennsylvania, New York State, West Virginia, and Kentucky have noted even larger variations in resistivity than those illustrated here. Although the values at this particular site are of very high resistivity, similar large variations have been observed in areas where the resistivity values are lower. When resistivity values with these variations are encountered even where the variations are less extreme, there arise questions.

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