Corrosion of steel by alternating current (AC) has been investigated since the turn of the century. Studies in the 1950s and 1960s indicated that AC corrosion of steel was only 1 to 2% of an equivalent amount of harmful direct current (DC) corrosion, and was controlled to negligible levels when cathodic protection (CP) was applied to industry standards. A 1986 investigation of a corrosion failure on a high-pressure, well-protected gas pipeline in Germany indicated that the sole cause was AC corrosion. Studies found that above a certain minimum AC current density, normal levels of CP will not control AC corrosion to acceptable levels. AC mitigation often is required to prevent serious corrosion.
AC corrosion - a challenge to pipeline integrity
Materials Performance ; 38 , 2 ; 24-31
1999
8 Seiten, 26 Quellen
Article (Journal)
English
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