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基于X70钢腐蚀检查片的交流腐蚀安全边界测试探析

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  • (1.安科工程技术研究院(北京) 有限公司, 北京 102200; 2.国家管网集团西气东输公司, 上海 210000;3.北京科技大学新材料技术研究院, 北京 100083)
吴广春(1986-),工程师,硕士,从事腐蚀与防护研究,电话:13686425900,E-mail:584846686@qq.com

收稿日期: 2023-03-16

  修回日期: 2023-04-12

  录用日期: 2023-05-12

  网络出版日期: 2023-09-15

Testing Analysis of AC Corrosion Safety Boundary Based on X70 Steel Corrosion Coupons

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  • (1.Safetech Research Institute, Beijing 102200, China;2.PipeChina West East Gas Pipeline Company, Shanghai 210000, China;3.Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China)

Received date: 2023-03-16

  Revised date: 2023-04-12

  Accepted date: 2023-05-12

  Online published: 2023-09-15

摘要

以在国内6 个城市埋设阴极保护腐蚀检查片开展现场测试为研究手段,结合部分室内腐蚀模拟试验结果,通过试片的阴极保护和干扰参数与腐蚀速率的关联性分析初步建立了交流干扰下埋地管道阴极保护安全边界,结论如下:交流干扰下试片的腐蚀速率随试片面积增大而减小;建立了基于极化电位的交流腐蚀安全边界:控制极化电位位于-0.85~-1.20 V(vs CSE)区间且交流电流密度小于30.0 A/m2或控制极化电位位于-0.95 ~-1.10 V(vs CSE)区间且交流电流密度小于100.0 A/m2;建立了基于直流电流密度的交流腐蚀安全边界:控制直流电流密度位于0.15~20.00 A/m2区间且交流电流密度小于30.0 A/m2或控制直流电流密度位于0.15~1.08 A/m2区间且交流电流密度小于100.0 A/m2;建立了基于pH 值的交流腐蚀安全边界:控制pH 值位于10.0 ~14.0 区间且交流电流密度小于30.0 A/m2或控制pH 值位于11.3~12.5 区间且交流电流密度小于100.0 A/m2

本文引用格式

吴广春, 曹国飞, 陈玉亮, 张梦梦, 王修云, 杜艳霞 . 基于X70钢腐蚀检查片的交流腐蚀安全边界测试探析[J]. 材料保护, 2023 , 56(9) : 169 -176 . DOI: 10.16577/j.issn.1001-1560.2023.0228

Abstract

In this paper, based on the on-site testing of cathodic protection corrosion coupons buried in 6 cities in China, combined with some indoor corrosion simulation test results, the safety boundary of cathodic protection for buried pipelines under AC interference was preliminarily established through the analysis of the correlation between cathodic protection and interference parameters of the test coupons and corrosion rates.Results showed that corrosion rate of the test coupons under AC interference decreased with the increase of the test coupons area.The AC corrosion safety boundary based on polarization potential was established: control the polarization potential to be in the range of-0.85~-1.20 V(vs CSE) and the AC current density to be less than 30.0 A/m2, or control the polarization potential to be in the range of-0.95~-1.10 V(vs CSE) and the AC current density to be less than 100.0 A/m2.The AC corrosion safety boundary based on DC current density was established: control the DC current density to be in the range of 0.15~20.00 A/m2 and the AC current density to be less than 30.0 A/m2, or control the DC current density to be in the range of 0.15~1.08 A/m2 and the AC current density to be less than 100.0 A/m2.The AC corrosion safety boundary based on pH was established: control the pH to be in the range of 10.0 ~14.0 and AC current density to be less than 30.0 A/m2 or control the pH to be in the range of 11.3~12.5 and AC current density to be less than 100.0 A/m2.

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