基于正交方法研究阴极保护电位波动下X100管线钢的点蚀行为

doi:10.11902/1005.4537.2019.267

中国腐蚀与防护学报

2020, Vol. 40

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

海洋材料腐蚀与防护专辑

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基于正交方法研究阴极保护电位波动下X100管线钢的点蚀行为

戴明杰¹^,², 刘静¹^,²(

), 黄峰¹^,², 胡骞¹^,², 李爽¹

1 武汉科技大学省部共建冶金与耐火国家重点实验室武汉 430081
2 武汉科技大学湖北省海洋工程材料及服役安全工程技术研究中心武汉 430081

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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摘要:

利用方波极化技术模拟阴极保护电位波动，通过正交试验方法研究不同电位波动参数，如电位波动频率 (f)、电位波动幅度 (E)、占空比 (δ)、电位总加载时间 (t_t) 等，对酸性土壤环境中X100管线钢表面点蚀行为的影响程度大小。结果表明，电位波动参数对点蚀密度影响的顺序为：t_t＞δ＞f＞E。当f为0.5 Hz，E为-0.95~-0.7 V，δ为50%和t_t为3 d时，宏观点蚀密度最大，即X100管线钢抗局部腐蚀性最差。同时，宏观点蚀密度随f增大而增大，随E升高而增大，在δ为50%时达到最大值，随t_t的延长而增大。

关键词 ：正交试验, 阴极保护, 管线钢, 点蚀

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

收稿日期: 2019-12-18

ZTFLH:

TG174

基金资助:国家自然科学基金(51871171);国家自然科学基金(51871172)

通讯作者: 刘静 E-mail: liujing@wust.edu.cn

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

作者简介: 戴明杰，男，1989年生，博士

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引用本文:

戴明杰, 刘静, 黄峰, 胡骞, 李爽. 基于正交方法研究阴极保护电位波动下X100管线钢的点蚀行为[J]. 中国腐蚀与防护学报, 2020, 40(5): 425-431.
Mingjie DAI, Jing LIU, Feng HUANG, Qian HU, Shuang LI. 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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.267 或 https://www.jcscp.org/CN/Y2020/V40/I5/425

图1 方波极化电位模拟阴极保护电位波动的示意图

表1 正交试验的因素水平表

图2 试验后界面宏观点蚀形貌图

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	---

表2 试验点蚀统计结果及极差分析

图3 因素 (f，E，S和tt)-指标趋势图

图4 电位总加载时间为1 d时不同电位波动频率下宏观点蚀密度统计图

图5 电位波动半周期为1 s时不同电位总加载时间下宏观点蚀密度统计图

图6 上电位Eu上升时的宏观点蚀密度统计结果

图7 电化学体系的等效电路图

表3 正交试验方差分析

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