原油沉积水对Q235B碳钢的腐蚀影响
发布时间：2019-02-15 15:14
【摘要】：采用电化学阻抗、丝束电极、SEM/EDS和XRD的分析方法,研究原油沉积水对Q235B碳钢腐蚀行为的影响。结果表明,碳钢在沉积水中浸泡21 d过程中,腐蚀速率逐渐降低,腐蚀形式以均匀腐蚀为主;而从21~35 d浸泡过程中,碳钢的腐蚀速率逐渐增大,且腐蚀程度加剧,腐蚀形态由均匀腐蚀为主转变为以点蚀为主的局部腐蚀,点蚀的大小和密集度增加。这是由于在起始阶段,碳钢表面沉积一层CaCO_3,有效地阻碍了腐蚀,而随着时间的延长,CaCO_3逐渐失去对碳钢基体的保护,从而加速局部腐蚀的发生。
[Abstract]:The effect of crude oil deposition water on corrosion behavior of Q235B carbon steel was studied by electrochemical impedance, wire beam electrode, SEM/EDS and XRD. The results show that the corrosion rate of carbon steel decreases gradually during 21 days immersion in the deposited water, and the corrosion form is mainly uniform corrosion. The corrosion rate and corrosion degree of carbon steel increased gradually from 21 to 35 days, and the corrosion morphology changed from uniform corrosion to pitting local corrosion, and the size and intensity of pitting corrosion increased. This is due to the fact that at the initial stage, a layer of CaCO_3, deposited on the surface of carbon steel effectively hinders corrosion, but with the extension of time, CaCO_3 gradually loses the protection of the carbon steel substrate, thus accelerating the occurrence of local corrosion.
【作者单位】： 中国石化青岛安全工程研究院;中国石化石油化工科学研究院;中国科学院宁波材料技术与工程研究所;
【基金】：中国石化安全工程研究院资金(Y-199和Y-200) 国家自然科学基金(41506098) 中国博士后基金和第九批特等(2015M580528和2016T90553) 宁波市自然科学基金(2016A610261)~~
【分类号】：TE988
本文编号：2423478
[Abstract]:The effect of crude oil deposition water on corrosion behavior of Q235B carbon steel was studied by electrochemical impedance, wire beam electrode, SEM/EDS and XRD. The results show that the corrosion rate of carbon steel decreases gradually during 21 days immersion in the deposited water, and the corrosion form is mainly uniform corrosion. The corrosion rate and corrosion degree of carbon steel increased gradually from 21 to 35 days, and the corrosion morphology changed from uniform corrosion to pitting local corrosion, and the size and intensity of pitting corrosion increased. This is due to the fact that at the initial stage, a layer of CaCO_3, deposited on the surface of carbon steel effectively hinders corrosion, but with the extension of time, CaCO_3 gradually loses the protection of the carbon steel substrate, thus accelerating the occurrence of local corrosion.
【作者单位】： 中国石化青岛安全工程研究院;中国石化石油化工科学研究院;中国科学院宁波材料技术与工程研究所;
【基金】：中国石化安全工程研究院资金(Y-199和Y-200) 国家自然科学基金(41506098) 中国博士后基金和第九批特等(2015M580528和2016T90553) 宁波市自然科学基金(2016A610261)~~
【分类号】：TE988
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