Corrosion Behavior of Pipeline Steel Under High-speed Railway Dynamic AC Interference

doi:10.11902/1005.4537.2021.212

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (1): 127-134 DOI: 10.11902/1005.4537.2021.212

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Corrosion Behavior of Pipeline Steel Under High-speed Railway Dynamic AC Interference

DENG Jiali¹, YAN Maocheng²(

), GAO Bowen², ZHANG Hui²

^1.Shandong Shihua Natural Gas Co. Ltd. , Qingdao 266071, China
^2.National Engineering Research Center for Corrosion Control, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract

Corrosion behavior of a pipeline steel in an artificial soil in the presence of dynamic AC interference, as a simulation of the interference of high-speed railway, is studied by means of mass-loss method, electrochemical measurements and surface analysis technique. The results show that, in the presence of dynamic AC interference, cathodic protection potential shifts to the negative direction, while the AC interference can increase the cathodic protection current density of the pipeline steel coupon. With the increase of interference intensity, the corrosion degree of pipeline steel increases and the pits deepen obviously. Cathodic protection (CP) can significantly slow down the corrosion degree of pipeline samples induced by the AC interference, and the corrosion rate is reduced to half of that of samples without cathodic protection. In the precent experimental case, the applied potential -1.0 V CP can fully protect the pipeline steel from corrosion induced by the dynamic AC interference with stray current below 100 A/m².

Key words: pipeline steel stray current interference AC interference AC corrosion cathodic protection

Received: 24 August 2021

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52071320);National Platform for Environment Corrosion of Materials(2005dka10400)

Corresponding Authors: YAN Maocheng E-mail: yanmc@imr.ac.cn

About author: YAN Maocheng, E-mail: yanmc@imr.ac.cn

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Cite this article:

DENG Jiali, YAN Maocheng, GAO Bowen, ZHANG Hui. Corrosion Behavior of Pipeline Steel Under High-speed Railway Dynamic AC Interference. Journal of Chinese Society for Corrosion and protection, 2022, 42(1): 127-134.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.212 OR https://www.jcscp.org/EN/Y2022/V42/I1/127

Fig.1 Schematic diagram of the experimental device

Fig.2 Schematic diagram of different AC current density interference experiments

Table 1 Experimental parameter settings under dynamic AC interference conditions

Fig.3 Polarization curves of samples under different AC interference level

Fig.4 DC and AC potential of X65 steel sample under different dynamic AC interference: (a1~a2) DC potential, (b1~b2) AC potential of the sample under CP+100 A/m² AC, (c1~c2) DC potential, (d1~d2) AC potential of the sample under CP+100 A/m² AC

Fig.5 SEM images of corrosion products on X65 steel after dynamic AC interference test: (a1~a3) 100 A/m² AC; (b1~b3) 300 A/m² AC

Fig.6 XRD pattern of corrosion products on sample surface

Fig.7 Surface morphologies of X65 steel coupons after dynamic AC interference test under cathodic protection: (a1~a3) CP+100 A/m² AC; (b1~b3) CP+300 A/m² AC; (a1, b1, c1) Sand and corrosion products, (a2, b2, c2) corrosion products, (a3, b3, c3) after corrosion products removed

Fig.8 SEM images of corrosion products on X65 steel after dynamic AC interference test under cathodic protection: (a1~a3) CP+100 A/m² AC; (b1~b3) CP+300 A/m² AC

Fig.9 SEM images of X65 steel corrosion morphology after dynamic AC interference test: (a1~a3) without CP, 100 A/m² AC; (b1~b3) without CP 300 A/m² AC; (c1~c3) CP+100 A/m² AC; and (d1~d3) CP+300 A/m² AC

Fig.10 Laser confocal diagram of etch pits on X65 steel coupon after dynamic AC interference test: (a) CP+100 A/m² AC (38.9 μm); (b) CP+300 A/m² AC (57.9 μm); (c) 100 A/m² AC (45.7 μm); (d) 300 A/m² AC (61.1 μm)

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