低含水率和温度对X80 管线钢在沈阳土壤模拟溶液中腐蚀行为的影响

张晓龙

doi:10.16577/j.issn.1001-1560.2023.0161

材料保护 >

2023 , Vol. 56 >Issue 7: 57 - 63

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0161

试验研究

低含水率和温度对X80 管线钢在沈阳土壤模拟溶液中腐蚀行为的影响

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中石油辽河油田油气集输公司，辽宁盘锦 124000

张晓龙(1989-)，工程师，大学本科，研究方向为油田地面工程，E-mal:765657228＠qq.com

收稿日期: 2023-02-12

修回日期: 2023-03-15

录用日期: 2023-04-12

网络出版日期: 2023-08-23

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Effect of Low Water Content and Temperature on Corrosion Behavior of X80 Pipeline Steel in Shenyang Soil Simulated Solution

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PetroChina Liaohe Oilfield Oil and Gas Gathering and Transportation Company，Panjin 124000，China

Received date: 2023-02-12

Revised date: 2023-03-15

Accepted date: 2023-04-12

Online published: 2023-08-23

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摘要

为探究低含水率和温度对X80 管线钢在沈阳草甸土土壤模拟溶液中对电化学腐蚀行为的影响，利用失重试验、交流阻抗技术、动电位极化技术方法测定其阻抗谱、极化曲线等数据并结合扫描电子显微镜(SEM)进行分析。结果表明随着含水率由10%升高至30%过程中，产物膜被破坏，从而逐渐加剧了X80 管线钢的腐蚀，生成大腐蚀坑。含水率为30%时腐蚀最为严重。以极致腐蚀性含水率(30%)进行不同温度的电化学试验发现，随着温度的升高会加速X80 钢在沈阳土壤中的腐蚀速率.室温(16 ℃)下，X80 钢的产物膜较为致密，完整性较好，覆盖均匀，对试样起到保护作用，腐蚀程度较轻；当温度逐渐升高至异常温度(65 ℃)时，试件腐蚀速率明显加快，试样表面的产物膜破损严重，完整性和均匀性都较差，腐蚀产物大面积脱落，腐蚀行为加剧。

关键词： 含水率; 温度; 腐蚀; X80 管线钢; 沈阳草甸土

本文引用格式

张晓龙 . 低含水率和温度对X80 管线钢在沈阳土壤模拟溶液中腐蚀行为的影响[J]. 材料保护, 2023 , 56(7) : 57 -63 . DOI: 10.16577/j.issn.1001-1560.2023.0161

Abstract

Aiming at exploring the effect of low water content and temperature on the electrochemical corrosion behavior of X80 pipeline steel in Shenyang soil simulated solution，the data of impedance spectrum and polarization curve were measured by weight loss test，AC impedance technique and potentiodynamic polarization technique，and analyzed by scanning electron microscope (SEM).Results showed that as the water content increased from 10%to 30%，the product film was destroyed，which gradually aggravated the corrosion of X80 pipeline steel and generated large corrosion pits.The corrosion was the most serious when the water content was 30%.Moreover，electrochemical tests at different temperatures with extremely corrosive water content (30%) showed that the corrosion rate of X80 steel in Shenyang soil increased with the increase of temperature.At room temperature (16 °C)，the product film of X80 steel was dense，the integrity was good，the coverage was uniform.It had a protective effect on the sample，and the corrosion degree was slight.When the temperature gradually increased to the abnormal temperature (65 °C)，the corrosion rate of the sample was obviously accelerated，the product film on the surface of the sample was seriously damaged，the integrity and uniformity were poor，the corrosion products fell off in a large area，and the corrosion behavior was aggravated.

Key words： water content; temperature; corrosion; X80 pipeline steel; Shenyang meadow soil

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