T/S-52K直缝钢在不同Cl<sup>-</sup>浓度下的腐蚀行为

doi:10.11902/1005.4537.2020.109

中国腐蚀与防护学报

2021, Vol. 41

Issue (4): 555-559 DOI: 10.11902/1005.4537.2020.109

研究报告

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T/S-52K直缝钢在不同Cl^-浓度下的腐蚀行为

吕祥鸿¹, 马晓凤¹(

), 胡兆伟², 李媛媛², 王晨¹

^1.西安石油大学材料科学与工程学院西安 710065
^2.中国石油新疆油田油气储运分公司克拉玛依 831100

Corrosion Behavior of T/S-52K Straight Seam Pipeline Steel in Solutions of Different NaCl Concentration

LV Xianghong¹, MA Xiaofeng¹(

), HU Zhaowei², LI Yuanyuan², WANG Chen¹

^1.School of Material Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China
^2.Oil-Gas Storage and Transportation Company, PetroChina Xinjiang Oilfield, Karamay 831100, China

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摘要:

通过模拟不同Cl^-浓度的腐蚀实验，结合EDS、SEM、EIS等分析手段，研究了T/S-52K直缝钢在不同Cl^-浓度环境中的腐蚀行为。结果表明，随着Cl^-浓度的增加，活化区域的阳极溶解加速，促进了试样表面的局部腐蚀，使得试样表面局部腐蚀严重；但随着腐蚀产物膜的覆盖，有效反应面积减小，所以试样的均匀腐蚀速率反而变化不大。当NaCl浓度为8 g/L时，T/S-52K直缝钢电极反应过程主要由扩散控制；当NaCl浓度为20 g/L时，T/S-52K直缝钢电极反应过程由扩散和活化共同控制；当NaCl浓度为35 g/L时，试样表面电极反应过程主要由活化极化所控制。

关键词 ： Cl^-浓度, 局部腐蚀, 扩散控制, 活化极化控制

Abstract：

The corrosion behavior of T/S-52K pipeline steel in solutions of different NaCl concentration was studied by means of EDS, SEM, EIS and other analysis methods. The results showed that with the increase of Cl^- concentration, the anodic dissolution of the activated regions was accelerated, which promoted the local corrosion of the sample surface, resulting in serious local corrosion. However, with the increasing coverage of the corrosion products scale, the effective reaction area decreased, so the uniform corrosion rate of the sample changed little. When NaCl concentration was 8 g/L, the reaction process of T/S-52K pipeline steel electrode was mainly controlled by diffusion. When NaCl concentration was 20 g/L, the reaction process of T/S-52K pipeline steel electrode was controlled by both diffusion and activation polarization. When NaCl concentration was 35 g/L, the electrode reaction process on the surface of the sample was mainly controlled by activation polarization.

Key words： concentration of Cl^- local corrosion diffusion control activated polarization control

收稿日期: 2020-06-23

ZTFLH:

TG172.2

基金资助:国家自然科学基金(51902254);陕西省自然科学基础研究计划(2016JM5064);西安石油大学《材料科学与工程》省级优势学科(YS37020203)

通讯作者: 马晓凤 E-mail: 1098273080@qq.com

Corresponding author: MA Xiaofeng E-mail: 1098273080@qq.com

作者简介: 吕祥鸿，男，1971年生，博士，教授

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引用本文:

吕祥鸿, 马晓凤, 胡兆伟, 李媛媛, 王晨. T/S-52K直缝钢在不同Cl^-浓度下的腐蚀行为[J]. 中国腐蚀与防护学报, 2021, 41(4): 555-559.
Xianghong LV, Xiaofeng MA, Zhaowei HU, Yuanyuan LI, Chen WANG. Corrosion Behavior of T/S-52K Straight Seam Pipeline Steel in Solutions of Different NaCl Concentration. Journal of Chinese Society for Corrosion and protection, 2021, 41(4): 555-559.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.109 或 https://www.jcscp.org/CN/Y2021/V41/I4/555

图1 Cl-浓度对T/S-52K直缝钢腐蚀速率的影响

图2 T/S-52K直缝钢试样在80 ℃下不同浓度NaCl溶液中浸泡168 h后未去除和去除腐蚀产物的表面宏观形貌

图3 T/S-52K直缝钢试样在80 ℃下不同浓度NaCl溶液中浸泡168 h后未去除和去除腐蚀产物的表面微观形貌

图4 T/S-52K直缝钢试样在80 ℃下不同浓度的NaCl溶液中浸泡168 h后表面EDS分析结果

图5 T/S-52K直缝钢试样在80 ℃下不同浓度的NaCl溶液中浸泡72 h后的电化学阻抗图谱及其等效电路

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