低碳钢Q235、管线钢L415和压力容器钢16MnNi在湛江高湿高辐照海洋工业大气环境下的初期腐蚀行为

doi:10.11900/0412.1961.2021.00305

金属学报

2023, Vol. 59

Issue (7): 884-892 DOI: 10.11900/0412.1961.2021.00305

研究论文

本期目录 | 过刊浏览

低碳钢Q235、管线钢L415和压力容器钢16MnNi在湛江高湿高辐照海洋工业大气环境下的初期腐蚀行为

李小涵¹^,², 曹公望²(

), 郭明晓¹^,², 彭云超³, 马凯军³, 王振尧²(

)

¹中国科学技术大学材料科学与工程学院沈阳 110016
²中国科学院金属研究所沈阳 110016
³国家管网集团东部原油储运有限公司徐州 221008

Initial Corrosion Behavior of Carbon Steel Q235, Pipeline Steel L415, and Pressure Vessel Steel 16MnNi Under High Humidity and High Irradiation Coastal-Industrial Atmosphere in Zhanjiang

LI Xiaohan¹^,², CAO Gongwang²(

), GUO Mingxiao¹^,², PENG Yunchao³, MA Kaijun³, WANG Zhenyao²(

)

¹School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
²Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
³PipeChina Network Corporation Eastern Oil Storage and Transportation Co., Ltd., Xuzhou 221008, China

引用本文:

李小涵, 曹公望, 郭明晓, 彭云超, 马凯军, 王振尧. 低碳钢Q235、管线钢L415和压力容器钢16MnNi在湛江高湿高辐照海洋工业大气环境下的初期腐蚀行为[J]. 金属学报, 2023, 59(7): 884-892.
Xiaohan LI, Gongwang CAO, Mingxiao GUO, Yunchao PENG, Kaijun MA, Zhenyao WANG. Initial Corrosion Behavior of Carbon Steel Q235, Pipeline Steel L415, and Pressure Vessel Steel 16MnNi Under High Humidity and High Irradiation Coastal-Industrial Atmosphere in Zhanjiang[J]. Acta Metall Sin, 2023, 59(7): 884-892.

全文: PDF(2398 KB) HTML

摘要:

通过失重分析、腐蚀形貌观察、腐蚀产物分析和电化学测试等方法，对油库常用金属材料低碳钢Q235、管线钢L415和压力容器钢16MnNi暴露在湛江实际真实大气环境中180 d的初期腐蚀行为进行研究。结果表明，大气中的Cl^-、SO₂和紫外辐照的协同作用加剧了油库常用材料的腐蚀。锈层成分显著影响钢材的腐蚀过程，在此环境下，3种材料服役相同时间时，发生的腐蚀差异主要是由于腐蚀产物的种类和含量造成的。由于低碳钢Q235锈层中含有较多的β-FeOOH、γ-FeOOH和Fe₃O₄，导致其较高的腐蚀速率。

关键词 ：大气腐蚀, 腐蚀产物, 低碳钢Q235, 管线钢L415, 压力容器钢16MnNi

Abstract：

The Zhanjiang oil station is located near the sea, and corrosion factors such as Cl^-, SO₂, humidity, and UV irradiation in the surrounding environment will endanger the service life of the common materials. Carbon steel Q235 is commonly used as an oil tank pressure ring, pipeline steel L415 is used for oil and gas transportation, and pressure vessel steel 16MnNi is commonly used as the outer wall material of an oil tank. These materials are easily corroded when they are directly exposed to the atmosphere, but there have been few studies in recent years on the short-term corrosion behaviour of common metal materials in oil stations in high humidity and high irradiation industrial marine atmosphere environments. In this work, the initial corrosion behaviour of carbon steel Q235, pipeline steel L415, and pressure vessel steel 16MnNi exposed to the real Zhanjiang atmospheric environment for 180 d were studied through weight loss analysis, corrosion product analysis, corrosion morphology observation, and electrochemical analysis. According to the thickness loss data, carbon steel Q235 had the weakest corrosion resistance of the three materials, whereas pipeline steel L415 had the best corrosion resistance. These common materials were exposed to the same atmospheric environment for the same amount of time, resulting in the same corrosion products in the rust layer, which contained α-FeOOH, γ-FeOOH, and Fe₃O₄. The difference was that the rust layer of carbon steel Q235 contained a high concentration of β-FeOOH, which may have facilitated the corrosion process. The concentration of γ-FeOOH and Fe₃O₄ varied amongst the three materials. The rust layer of carbon steel Q235 contained more γ-FeOOH and Fe₃O₄, followed by pressure vessel steel 16MnNi and pipeline steel L415, which had the least γ-FeOOH and Fe₃O₄. Furthermore, carbon steel Q235 had the thinnest rust layer and the greatest thickness loss, whereas pipeline steel L415 and pressure vessel steel 16MnNi had a thicker rust layer and less thickness loss. The results of electrochemical experiments showed that the rust layer of carbon steel Q235 has the weakest ability to protect the matrix, whereas the rust layer of L415 has the best ability to protect the matrix. Additionally, the synergistic effect of Cl^-, SO₂, and UV irradiation destroyed the protective layer of the rust layer and accelerated the corrosion.

Key words： atmospheric corrosion corrosion product carbon steel Q235 pipeline steel L415 pressure vessel steel 16MnNi

收稿日期: 2021-07-27

ZTFLH:

TG172.3

通讯作者: 王振尧，zhywang@imr.ac.cn，主要从事自然环境腐蚀方面的研究;
曹公望，gwcao@imr.ac.cn，主要从事金属大气腐蚀方面的研究

Corresponding author: WANG Zhenyao, professor, Tel: (024)23893544, E-mail: zhywang@imr.ac.cn;
CAO Gongwang, Tel: 15040144450, E-mail: gwcao@imr.ac.cn

作者简介: 李小涵，女，1997年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00305 或 https://www.ams.org.cn/CN/Y2023/V59/I7/884

表1 Q235、L415和16MnNi钢的化学成分 (mass fraction / %)

图1 Q235、L415和16MnNi钢的微观组织

表2 湛江大气环境随时间的变化

图2 Q235、L415和16MnNi钢在湛江大气环境中暴露180 d时的厚度损失

图3 Q235、L415和16MnNi钢在相同时间相同环境下的表面形貌(180 d)

图4 Q235、L415和16MnNi钢暴露在湛江大气环境中180 d时的截面形貌

图5 Q235、L415和16MnNi钢暴露在相同环境相同时间下的XRD谱

图6 Q235、L415和16MnNi钢暴露在湛江大气环境中180 d的极化曲线

表3 Q235、L415和16MnNi钢的腐蚀电位(Ecorr)和腐蚀电流密度(icorr)

图7 Q235、L415和16MnNi钢暴露在湛江大气环境下180 d的Nyquist图和Bode图

图8 EIS的等效电路

表4 等效电路的拟合参数

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