Pitting Corrosion Behavior of X100 Pipeline Steel in a Simulated Acidic Soil Solution under Fluctuated Cathodic Protection Potentials Based on Orthogonal Method

doi:10.11902/1005.4537.2019.267

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (5): 425-431 DOI: 10.11902/1005.4537.2019.267

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Pitting Corrosion Behavior of X100 Pipeline Steel in a Simulated Acidic Soil Solution under Fluctuated Cathodic Protection Potentials Based on Orthogonal Method

DAI Mingjie¹^,², LIU Jing¹^,²(

), HUANG Feng¹^,², HU Qian¹^,², LI Shuang¹

1 State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2 Hubei Engineering Technology Research Center of Marine Materials and Service Safety, Wuhan University of Science and Technology, Wuhan 430081, China

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Abstract

The pitting behavior of X100 pipeline steel in an artificial solution, as a simulation of acidic soil environment was studied under fluctuated cathodic protection potentials with varying fluctuation parameters, such as potential fluctuation frequency (f), fluctuation amplitude (E), duty cycle (δ) and total loading time (t_t). While the fluctuated cathodic protection potentials were simulated by means of square wave polarization (SWP) technology. The results show that the influence intensity of the potential fluctuation parameters can be ranked as follows: t_t＞δ＞f＞E. However, among others, when the test lasted for 3 d with the following potential fluctuation parameters, namely f=0.5 Hz, E=-0.95~-0.7 V and δ=50%, the X100 pipeline steel presented the worst resistance to localized corrosion. Furthermore, the pitting density would rise with the increase of f, E and t_t, and reaches the maximum when δ is 50%.

Key words: orthogonal test cathodic protection pipeline steel pitting corrosion

Received: 18 December 2019

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51871171);National Natural Science Foundation of China(51871172)

Corresponding Authors: LIU Jing E-mail: liujing@wust.edu.cn

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Cite this article:

DAI Mingjie, LIU Jing, HUANG Feng, HU Qian, LI Shuang. Pitting Corrosion Behavior of X100 Pipeline Steel in a Simulated Acidic Soil Solution under Fluctuated Cathodic Protection Potentials Based on Orthogonal Method. Journal of Chinese Society for Corrosion and protection, 2020, 40(5): 425-431.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.267 OR https://www.jcscp.org/EN/Y2020/V40/I5/425

Fig.1 Schematic diagram of square wave polarization potential simulating cathodic protection potential fluctuation

Table 1 Orthogonal test of factors and levels table

Fig.2 Topography views of pitting after testing: (a) A1B1C1D1, (b) A1B2C2D2, (c) A1B3C3D3, (d) A2B1C2D3, (e)A2B2C3D1, (f) A2B3C1D2, (g) A3B1C3D2, (h) A3B2C1D3, (i) A3B3C2D1

Test number	Factors				Pitting density mm^-2
Test number	A (potential fluctuation frequency f ) / Hz	B (potential fluctuation range E) / V	C (duty cycleδ) / %	D (total loading time t_t) / d	Pitting density mm^-2
A1B1C1D1	0.5	-0.95~-0.9	30	1	645.167
A1B2C2D2	0.5	-0.95~-0.8	50	2	2379.119
A1B3C3D3	0.5	-0.95~-0.7	70	3	4249.170
A2B1C2D3	0.05	-0.95~-0.9	50	3	4151.511
A2B2C3D1	0.05	-0.95~-0.8	70	1	551.665
A2B3C1D2	0.05	-0.95~-0.7	30	2	1739.147
A3B1C3D2	0.005	-0.95~-0.9	70	2	906.974
A3B2C1D3	0.005	-0.95~-0.8	30	3	3220.642
A3B3C2D1	0.005	-0.95~-0.7	50	1	1293.451
K₁	7273.456	5703.653	5604.956	2490.283	---
K₂	6442.323	6151.426	7824.081	5025.240	---
K₃	5421.067	7281.768	5707.809	11621.323	---
$K ˉ 1$	2424.485	1901.218	1868.319	830.094	---
$K ˉ 2$	2147.441	2050.475	2608.027	1675.080	---
$K ˉ 3$	1807.022	2427.256	1902.603	3873.774	---
Range (R)	617.463	526.038	739.708	3043.680	---
Factor order	3	4	2	1	---
Maximum pitting density combination	0.5	-0.95~-0.7	50	3	---

Table 2 Pitting statistical results and range analysis of orthogonal test

Fig.3 Factor-indicator trend graph, the factor is: (a) potential fluctuation frequency (f); (b) potential fluctuation amplitude (E^{); (c) potential fluctuation duty ratio (δ); (d) potential total loading time (t_t)}

Fig.4 Statistic results of the pit density after various half period times from 0.1 s to 1 h with a total period of 1 d of SWP

Fig.5 Statistic results of pit density on the specimen under SWP condition of the half period of 1 s and various total potential fluctuating times from 0.5 d to 5 d

Fig.6 Statistical results of the pitting density under various upper potentials E_u from -0.90 V to -0.65 V of SWP

Fig.7 Equivalent circuit simulating the steel electrode/solution interface under SWP, where R_s is solution resistance, R_t is charge transfer resistance, C_dl is the capacitance of double charge layer, R₁ is the resistance of rust layer, and C₁ is the capacitance of the rust layer

Table 3 Variance analysis of orthogonal test

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