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-----Electrolysis of metal light poles
Q. We have several metal light poles in a trailer park, the electrolysis is slowly eating them I measured a 3/10 to 4/10 dc volts from the pole to ground.
Years ago I went to a school at the department of defense on this subject, cannot find my manuals on this.
Any suggestions or information on this problem will be appreciated.
- fayetteville, Pennsylvania
2006
A. Some general suggestions which may be modified depending upon materials of construction:
First, verify no stray electrical current -- any change in voltage with power off or on?
Remove bulk of corrosion by wire brushing with stainless steel brushes ⇦ on
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or high pressure water. Finish cleaning and pretreat using a phosphoric acid-based gel ("rust remover"). Rinse & allow to dry. Apply a cold galvanizing compound ⇦ on
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and either a polyurethane topcoat or an aluminum-fibered asphaltic paint ("roofing tar").
For galvanic corrosion, see MIL-STD-889 (with Notices) "DISSIMILAR METALS."
For surface preparation, coating selection and application, etc., see MIL-HDBK-1110 "HANDBOOK FOR PAINTS AND PROTECTIVE COATINGS FOR FACILITIES."
- Goleta, California
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