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Electrical riddle no.9 - Electrochemical corrosion
Sinusoidal high current elements can produce eddy induced currents in their surroundings .The eddy currents in electrical path around of power lines are AC type inherently. On the other hand, according to electrochemical fundamental laws, the AC induced current can not be caused any oxidation or corrosion effects.

How can you explain the reason of that recommendation?
Author : Hamid - From: IRAN
 
#1
Sat, January 26, 2008 - 18:32
Alternating currents influence on metal structures can be hazardous. There can be significant safety concerns. Please refer to this link. Also refer to numerous other NACE articles. Engage a corrosion engineer who is a member of NACE.

http://www.nace.org/nace/content/library/community/safety/SafetyNearPowerlines.pdf
 
Author : eriew
 
#2
Sat, January 26, 2008 - 18:33
This is not the 100% answer, only a partial one. Most metals oxidize from moisture, chemical salts, etc. and those oxides together with the metal itself can form a diode which then rectifies the ac into dc. Many of us have listened to am radio on lead power cables by this phenom.

__________________
Seek simplicity, and distrust it. Alfred North Whitehead  
Author : TVP45
 
#3
Sat, January 26, 2008 - 18:34
Thank you very much.

This is a wonderful reply. Please more explain about media semiconductors.

 
Author : Hamid
 
#4
Sat, January 26, 2008 - 18:35
The pipeline will couple to the EMF above. You may need to decouple the pipeline from the field to prevent pipeline corrosion. You may need to bond this pipeline to others nearby if the have an active cathodic protection.

http://web.nace.org/content/Publications/MP/2001/0108024.pdf
 
Author : eriew
 
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