Figure 2. - Typical performance curve for magnesium anodes*
* Office of Chief of Civil Engineers, "Corrosion Prevention", Part M Maintenance and Operation of Public
Works and Public Utilities, December 7, 1956.
This problem shows that sacrificial anodes should
not, in general, be used in soils or water whose
resistivity exceeds about 3000 ohm-centimeters
as the number of anodes required to supply suffi-
cient current for protection may be quite large and
the cost of installing the system may be excessive.
not, in general, be used in soils or water whose
resistivity exceeds about 3000 ohm-centimeters
as the number of anodes required to supply suffi-
cient current for protection may be quite large and
the cost of installing the system may be excessive.
If the computations call for a major installation of
anodes (more than five), the problem should be
referred to the Operation and Maintenance
anodes (more than five), the problem should be
referred to the Operation and Maintenance
Engineering Branch, Denver Office, D-5850, for
coordination with the Division of Design for
evaluation. Any request for evaluation of such
problems sent to the Denver Office should be
accompanied by a completed copy of the pertinent
Design Data Questionnaire found at the end of
this manual. Soil or water samples sent to the
Denver Office (to be tested for corrosivity to met-
als) should also be accompanied by a completed
questionnaire.
coordination with the Division of Design for
evaluation. Any request for evaluation of such
problems sent to the Denver Office should be
accompanied by a completed copy of the pertinent
Design Data Questionnaire found at the end of
this manual. Soil or water samples sent to the
Denver Office (to be tested for corrosivity to met-
als) should also be accompanied by a completed
questionnaire.
11 (FIST 4- 5)