AC Interference Corrosion of Pipeline Steel Beneath Delaminated Coating with Holiday

doi:10.11902/1005.4537.2017.118

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (4): 341-346 DOI: 10.11902/1005.4537.2017.118

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AC Interference Corrosion of Pipeline Steel Beneath Delaminated Coating with Holiday

Xiaolin WANG¹, Maocheng YAN²(

), Yun SHU², Cheng SUN², Wei KE²

1 Fushun Research Institute of Petroleum and Petrochemicals, SINOPEC, Fushun 113001, China
2 National Engineering Research Center for Corrosion Control, Environment Corrosion Center, Instituteof Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract

AC interference corrosion of X80 pipeline steel beneath a delaminated coating with an artificial damage is investigated via a simulated crevice cell by means of microelectrode technique in artificial neutral soil solution NS4. The results show that the applied AC interference may induce the negative shift of the free corrosion potential of X80 steel. With the increase of AC current density, the anodic dissolution rate of X80 steel increases, while the corrosion pattern changes from uniform corrosion to local corrosion. The corrosion of pipeline steel just on the damaged spot is the most serious, however, the corrosion attack of the steel beneath the delaminated coating around the damaged spot is slightly alleviated. When the AC interference current density increases up to 100 A/m², serious pitting corrosion appears on X80 steel surface, where locates even far from the damaged spot beneath the delaminated coating. The influence of AC interference on the corrosion behavior of pipeline steel beneath the damaged coating was discussed from aspects of the rectification effect of the AC interference, the irreversibility of anode reaction and the effect of AC on the double layer structure at the interface steel/solution.

Key words: pipeline steel AC interference coating cathodic protection electrical interference

Received: 20 July 2017

ZTFLH:

TG172.9

Fund: Supported by National Natural Science Foundation of China (51471176) and National Research and Development Infrastructure and Facility Development Program of China (2005DKA10400)

About author:

These authors contributed equally to this work.

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Cite this article:

Xiaolin WANG, Maocheng YAN, Yun SHU, Cheng SUN, Wei KE. AC Interference Corrosion of Pipeline Steel Beneath Delaminated Coating with Holiday. Journal of Chinese Society for Corrosion and protection, 2017, 37(4): 341-346.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2017.118 OR https://www.jcscp.org/EN/Y2017/V37/I4/341

Fig.1 Electrochemical cell simulating setup of corrosion of pipeline steel under disbonded coating

Fig.2 Schematic of experimental setup for AC interference application and test on pipeline steel at coating defect

Fig.3 Variations of corrosion potential of X80 pipeline steel with time under different AC current density interference

Fig.4 Potential evolutions of X80 steel at various positions under disbonded coating in the conditions of AC interferences of 20 A/m² (a) and 100 A/m² (b)

Fig.5 Potential distributions of X80 steel under disbonded coating in the conditions of AC interferences of 20 A/m² (a) and 100 A/m² (b)

Fig.6 SEM images of corrosion products of X80 steel at coating defect (a) and different positions with the distances of 45 mm (b), 125 mm (c) and 245 mm (d) from the defect under disbonded coating after immersion in NS4 solution for 72 h on the condition of AC interference of 20 A/m²

Fig.7 SEM surface morphologies of X80 steel at coating defect (a1~c1) and different positions with the distances of 45 mm (a2~c2), 125 mm (a3~c3) and 245 mm (a4~c4) from the defect under disbonded coating after immersion in NS4 solution for 72 h on the conditions of AC interferences of 0 (a1~a4), 20 A/m² (b1~b4) and 100 A/m² (c1~c4)

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