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51315-5594-Requirements of Coupon AC Current Density Affecting AC Corrosion of Buried Steel Pipelines

Picture for Requirements of Coupon AC Current Density Affecting AC Corrosion of Buried Steel Pipelines
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Product Number: 51315-5594-SG
ISBN: 5594 2015 CP
Author: Fumio Kajiyama
Publication Date: 2015
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It is widely recognized that at prevailing commercial current frequencies (such as 16-2/3 50 or 60 Hz) a.c. corrosion is possible even though cathodic protection level satisfies the ISO standard based on polarized potential. At present however there is no consensus about the a.c. corrosion mechanism and a.c. corrosion protection criterion for cathodically protected steel pipelines. Since the first incident of AC corrosion in the mid-1980s coupons have been used to evaluate AC corrosion likelihood over the last three decades. Although there is a controversy about the opinion that coupon AC current density is the primary factor in determining the AC corrosion likelihood coupon DC and AC current densities as well as coupon instant off-potential (polarized potential) are responsible for the corrosion process.Based upon the field investigation into cathodically protected steel pipelines under AC interference using the new coupon technology that is “Simultaneous acquisition of coupon DC and AC current densities for a single period of commercial current frequency with high data sampling rate of 0.1 ms and 16 bits” this paper discusses requirements to regard coupon AC current density as affecting AC corrosion of cathodically protected steel pipelines.
It is widely recognized that at prevailing commercial current frequencies (such as 16-2/3 50 or 60 Hz) a.c. corrosion is possible even though cathodic protection level satisfies the ISO standard based on polarized potential. At present however there is no consensus about the a.c. corrosion mechanism and a.c. corrosion protection criterion for cathodically protected steel pipelines. Since the first incident of AC corrosion in the mid-1980s coupons have been used to evaluate AC corrosion likelihood over the last three decades. Although there is a controversy about the opinion that coupon AC current density is the primary factor in determining the AC corrosion likelihood coupon DC and AC current densities as well as coupon instant off-potential (polarized potential) are responsible for the corrosion process.Based upon the field investigation into cathodically protected steel pipelines under AC interference using the new coupon technology that is “Simultaneous acquisition of coupon DC and AC current densities for a single period of commercial current frequency with high data sampling rate of 0.1 ms and 16 bits” this paper discusses requirements to regard coupon AC current density as affecting AC corrosion of cathodically protected steel pipelines.
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Experiments to study the effects of AC interference on cathodic protection (CP). Changes of CP potential and current density under AC interference and AC corrosion rates obtained. Effective CP potential under AC interference analyzed. Interference compared.
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