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05188 Role of Alkalization in AC Induced Corrosion of Pipelines and Consequences Hereof in Relation to CP Requirements

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In the present paper, characteristics of the AC corrosion problem are demonstrated using laboratory results and field measurements as examples.  Evidence has been given that the AC corrosion mechanisms involve alkalization of the environment nearby the coating defect, and in combination with AC, corrosion may be induced. 

Product Number: 51300-05188-SG
ISBN: 05188 2005 CP
Author: Lars Vendelbo Nielsen, MetriCorr Aps
Publication Date: 2005
Industries: Energy Generation , Cathodic Protection
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In the present paper, characteristics of the AC corrosion problem are demonstrated using laboratory results and field measurements as examples.  Evidence has been given that the AC corrosion mechanisms involve alkalization of the environment nearby the coating defect, and in combination with AC, corrosion may be induced.  Accordingly, besides the level of induced AC voltage, the CP level has a dramatic influence on the AC corrosion process. Excessive CP increases the AC corrosion rate and should therefore be avoided. Increasing the CP seems definitely to be the wrong solution to a potential AC corrosion problem.

Keywords: AC corrosion mechanisms, alkalization, cathodic protection requirements.

In the present paper, characteristics of the AC corrosion problem are demonstrated using laboratory results and field measurements as examples.  Evidence has been given that the AC corrosion mechanisms involve alkalization of the environment nearby the coating defect, and in combination with AC, corrosion may be induced.  Accordingly, besides the level of induced AC voltage, the CP level has a dramatic influence on the AC corrosion process. Excessive CP increases the AC corrosion rate and should therefore be avoided. Increasing the CP seems definitely to be the wrong solution to a potential AC corrosion problem.

Keywords: AC corrosion mechanisms, alkalization, cathodic protection requirements.

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