高压直流干扰下X80钢在广东土壤中的干扰参数变化规律及腐蚀行为研究

doi:10.11900/0412.1961.2017.00311

金属学报

2018, Vol. 54

Issue (6): 886-894 DOI: 10.11900/0412.1961.2017.00311

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高压直流干扰下X80钢在广东土壤中的干扰参数变化规律及腐蚀行为研究

秦润之¹, 杜艳霞¹(

), 路民旭¹, 欧莉², 孙海明²

1 北京科技大学新材料技术研究院北京 1000832 中石化石油工程设计有限公司东营 257026

Study of Interference Parameters Variation Regularity and Corrosion Behavior of X80 Steel in Guangdong Soil Under High Voltage Direct Current Interference

Runzhi QIN¹, Yanxia DU¹(

), Minxu LU¹, Li OU², Haiming SUN²

1 Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2 Sinopec Petroleum Engineering Corporation, Dongying 257026, China

引用本文:

秦润之, 杜艳霞, 路民旭, 欧莉, 孙海明. 高压直流干扰下X80钢在广东土壤中的干扰参数变化规律及腐蚀行为研究[J]. 金属学报, 2018, 54(6): 886-894.
Runzhi QIN, Yanxia DU, Minxu LU, Li OU, Haiming SUN. Study of Interference Parameters Variation Regularity and Corrosion Behavior of X80 Steel in Guangdong Soil Under High Voltage Direct Current Interference[J]. Acta Metall Sin, 2018, 54(6): 886-894.

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摘要:

通过室内模拟实验考察了大幅高压直流干扰电压下,X80钢在广东土壤中的干扰电流密度变化规律及腐蚀行为。结果表明,在50~300 V直流干扰电压下,电流密度随时间的变化呈现典型的3阶段特征：首先,在几秒内急剧上升到较高水平的峰值;然后,在几百秒内下降到较低水平的稳定值;最后,较长时间内维持在稳定值水平。结合干扰过程中试样附近土壤温度、含水率及电阻的测试分析表明,电流密度变化主要是由大幅干扰电压造成短时间内试片周围土壤温度升高,含水率降低,局部电阻率大幅增加所致。同时实验获得直流干扰电压分别为50、100、200及300 V时,1 h干扰实验中X80钢腐蚀速率分别为5.56、7.85、10.63及7.78 μm/h;腐蚀速率随直流干扰电压的升高呈现先增大后减小的趋势,该趋势不同于电流密度峰值随直流干扰电压的变化规律,但与电流密度稳定值的变化规律相似。此外,分析了高压直流干扰下试样腐蚀速率与使用3种形式电流密度计算得到的理论腐蚀速率之间的相关性。结果表明,利用干扰过程中电流密度曲线积分计算得出的理论腐蚀速率误差最小;利用电流密度稳定值计算得到的腐蚀速率误差次之;利用电流密度峰值计算得出的理论腐蚀速率误差最大,可达到实测腐蚀速率的若干倍。据此提出了实际高压直流干扰下参数监测与腐蚀速率的预测方法。

关键词 ：高压直流, 直流干扰, 腐蚀速率, 电流密度, 变化规律

Abstract：

High voltage direct current transmission (HVDC) systems develop fast in China recently. The ground electrodes of HVDC systems can inject/absorb large amount of DC current into/from soil, introducing DC interference to nearby pipelines. Then the pipe-to-soil potential shifts positively and high corrosion risk may appear. In this work, indoor HVDC simulation experiments were designed and carried out based on the field test results. Under high voltages, the variation regularity of DCdensity and the corrosion behavior of X80 steel in Guangdong soil were studied. The result showed that under 50, 100, 200 and 300 V DC voltages, the DC density of the coupons had the same trend and could be divided into 3 stages. Firstly, the DC density climbed to peak sharply in several seconds. Then, the DC density decreased gradually to steady value in hundreds of seconds. Lastly, the DC density stayed at that level for the rest of time. The local environment was monitored. The results indicated the variation of the DC density was mainly related to the local soil temperature increment, water content decrement and the substantially growth of the soil spread resistance. After the interference, the corrosion rates were measured to be 5.56, 7.85, 10.63 and 7.78 μm/h, respectively. The variation regularity of the corrosion rates was same with the steady values of DC density, but different from the peak values. Furthermore, 3 methods of calculating corrosion rates were studied. The theoretical corrosion rates calculated by integration of DC density curve had the smallest errors compared with the measured values. The method of using steady DC density had bigger errors and using peak DC density led to the biggest errors. Based on the results, the method of predicting HVDC corrosion rate was proposed.

Key words： HVDC DC interference corrosion rate current density variation regularity

收稿日期: 2017-07-24

ZTFLH:

TG178

基金资助:国家重点研发计划项目No.2016YFC0802101

作者简介:

作者简介秦润之,男,1990年生,博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2017.00311 或 https://www.ams.org.cn/CN/Y2018/V54/I6/886

图1 高压直流干扰模拟实验装置示意图

图2 X80钢试样在50~300 V直流干扰电压下直流电流密度随时间的变化曲线

图3 峰值电流密度和稳定值电流密度随干扰电压的变化规律

图4 高压直流干扰过程中试片表面1 cm处的土壤温度变化

图5 高压直流干扰施加前后试样表面不同距离处土壤含水率

图6 高压直流干扰施加前后土壤扩散电阻(Rsoil)的变化

图7 X80钢在50~300 V直流电位干扰1 h后的腐蚀形貌

图8 不同高压直流干扰下腐蚀产物的Raman光谱

表1 X80钢在50~300 V直流干扰电压下的失重与腐蚀速率

表2 干扰结束时电流密度实测值与计算值比较

图9 300 V干扰电压下利用电流密度曲线计算的腐蚀速率

表3 3种电流密度计算得到的腐蚀速率与误差

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