Bacterial corrosion of mild steel under the condition of simultaneous formation of ferrous and sulphide ions

1987 ◽  
Vol 26 (3) ◽  
pp. 294-298 ◽  
Author(s):  
C. O. Obuekwe ◽  
D. W. S. Westlake ◽  
J. A. Plambeck
Keyword(s):  
Mild Steel ◽  
Simultaneous Formation ◽  
Sulphide Ions ◽  
Bacterial Corrosion

Evidence that available energy is a limiting factor in the bacterial corrosion of mild steel by a Pseudomonas sp.

1987 ◽  
Vol 33 (3) ◽  
pp. 272-275 ◽  
Author(s):  
C. O. Obuekwe ◽  
D. W. S. Westlake ◽  
J. A. Plambeck
Keyword(s):  
Mild Steel ◽  
Produced Water ◽  
Sodium Lactate ◽  
Limiting Factor ◽  
Pseudomonas Sp ◽  
High Substrate ◽  
Available Energy ◽  
Substrate Level ◽  
Bacterial Corrosion ◽  
Corrosion Of Steel

Corrosion of mild steel coupons in cultures of Pseudomonas sp. no. 200 was inhibited (polarized) when the available energy was low, but was depolarized at high available substrate levels. Thus, the corrosion of the steel coupons which was partially inhibited in produced water was depolarized (made active) by the addition of 900 mg sodium lactate per litre. Also sustained corrosion of the steel coupons was only obtained at a high substrate level (1800 μg lactate∙L−1), and at lower levels (300 and 600 μg∙L−1) it was inhibited. Therefore, available energy is a limiting factor in bacterial corrosion of steel.

Corrosion of mild steel in media containing sulphide ions

1993 ◽  
Vol 28 (3) ◽  
pp. 194-200 ◽  
Author(s):  
T. F. Otero ◽  
C. Achucarro
Keyword(s):  
Mild Steel ◽  
Sulphide Ions

The Effects of Carbonate-Bicarbonate Concentration on Empirical Corrosion Diagram of Mild Steel as a Material of Geological Disposal Package for High Level Nuclear Wastes

1996 ◽  
Vol 451 ◽  
Author(s):  
Guen Nakayama ◽  
Yuichi Fukaya ◽  
Masatsune Akashi
Keyword(s):  
Mild Steel ◽  
Human Life ◽  
General Corrosion ◽  
Nuclear Wastes ◽  
Bicarbonate Concentration ◽  
Sulfate Ions ◽  
Geological Disposal ◽  
Groundwater Environment ◽  
High Level ◽  
Corrosion Diagram

ABSTRACTIn the scheme for geological disposal of high level radioactive nuclear wastes, the burial pit is to be isolated from the sphere of human life by a multiple-barrier system, which consists of an artificial barrier, composed of a canister, an overpack and a bentonite cushioning layer, and a natural barrier, which is essentially the bedrock. As the greatest as well as essentially the sole detriment to its integrity would be corrosion by groundwater. The groundwater comes to it seeping through the bentonite zone, thereby attaining conceivably the pH of transition from general corrosion to passivity, pHd, the behaviors of mild steel in such a groundwater environment have been examined. It has been shown that the pHd is lowered (enlargement of the passivity domain) with rising temperature and carbonate-bicarbonate concentration, while it is raised (enlargement of the general corrosion region) with increasing concentrations of chloride and sulfate ions.

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