General principles of cathodic protection of buried or immersed onshore metallic structures

2019 ◽  
Keyword(s):  
Cathodic Protection ◽  
Metallic Structures

Continuous Recording of Pipe-to-Soil Potential vs Distance

CORROSION ◽  
1961 ◽  
Vol 17 (9) ◽  
pp. 446t-448t
Author(s):  
ROBERT L. DAVIS
Keyword(s):  
Cathodic Protection ◽  
Hot Spots ◽  
Continuous Recording ◽  
Recording Device ◽  
Electrical Field ◽  
Metallic Structures ◽  
The Earth ◽  
Efficiency And Effectiveness ◽  
Further Development

Abstract Equipment and a method useful in making a continuous recording of pipe-to-soii and certain other potentials significant in cathodic protection of underground metallic structures are described. The device consists of a wheel electrode, mechanically and electrically connected to a recording device which plots distances and potentials continuously as it is rolled along the earth's surface over a pipeline, or over an electrical field in the earth. The method permits locating “hot spots” on lines with considerable accuracy, usually within a few feet. This radically improves the efficiency and effectiveness of protection at these points. Further development of the device to record the direction of currents is contemplated using modified equipment. 4.5.3, 7.7

Reaction Products of Cathodically Protected Steel in Soil

1985 ◽  
Vol 43 ◽  
pp. 274-275
Author(s):  
T. J. Moore
Keyword(s):  
Cathodic Protection ◽  
Solid Phase ◽  
Reaction Products ◽  
X Ray Diffraction ◽  
Metal Interface ◽  
Metallic Structures ◽  
X Ray ◽  
Magnesium Salts ◽  
One Year ◽  
Soil Metal

Cathodic protection is employed in soils to reduce the corrosion sustained by metallic structures in aggressive soil environments. This study is designed to investigate the mechanisms of cathodic protection :n soils by observing the solid phase products which precipitate as a result of these reactions.Cathodic protection of mild steel specimens was monitored using sacrificial magnesium anodes placed in two soils at four depths. After a period of one year, the samples were retrieved, vacuum dried, and subjected to scanning electron microscopy, electron microprobe analysis, and x-ray diffraction.The solid phases precipitated at the soil/metal interface may be categorized into two groups: 1) A thin coating of iron oxides and 2) A thicker layer of magnesium salts.

The Cathodic Protection of Metallic Structures In Marine Environments★

CORROSION ◽  
1956 ◽  
Vol 12 (7) ◽  
pp. 27-31
Author(s):  
W. A. BOWEN
Keyword(s):  
Automatic Control ◽  
Cathodic Protection ◽  
Sea Water ◽  
Marine Environments ◽  
Metallic Structures

Abstract Theoretical and practical considerations involved in using cathodic protection in sea water are covered, including anode location, polarization, economics and other factors. Specific cases of cathodic protection application are mentioned, including drydocks and ships. Means of checking the effectiveness of cathodic protection are reviewed. The importance of supervision by competent personnel is mentioned, as is automatic control of potentials. Other topics discussed include use of compartmented cells, effect of cathodic protection current on marine growth and problems involved in making cathodic protection automatic. 5.2.1

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