原油沉积水对Q235B碳钢的腐蚀影响

doi:10.11902/1005.4537.2016.212

中国腐蚀与防护学报

2017, Vol. 37

Issue (2): 126-134 DOI: 10.11902/1005.4537.2016.212

研究报告

本期目录 | 过刊浏览

原油沉积水对Q235B碳钢的腐蚀影响

程庆利^1,²(

),陶彬¹,刘栓³(

),刘全桢¹,张卫华¹,田松柏²,王立平³

1 中国石化青岛安全工程研究院青岛 266071
2 中国石化石油化工科学研究院北京 100083
3 中国科学院宁波材料技术与工程研究所宁波 315201

Corrosion Behaviour of Q235B Carbon Steel in Sediment Water From Crude Oil

Qingli CHENG^1,²(

),Bin TAO¹,Shuan LIU³(

),Quanzhen LIU¹,Weihua ZHANG¹,Songbai TIAN²,Liping WANG³

1 SINOPEC Qingdao Research Institute of Safety Engineering, Qingdao 266071, China
2 SINOPEC Research Institute of Petroleum Processing, Beijing 100083, China
3 Institute of Materials Technology, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences, Ningbo 315201, China

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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CaCO₃,有效地阻碍了腐蚀,而随着时间的延长,CaCO₃逐渐失去对碳钢基体的保护,从而加速局部腐蚀的发生。

关键词 ：原油沉积水, Q235B碳钢, 腐蚀, 丝束电极

Abstract：

With the increasing import of high-sulfur oils, the storage tank bottom plates suffer severe corrosion from sediment water, which often cause the leakage of crude oil and result in serious economic loss and environmental pollution. The corrosion behavior of Q235B carbon steel in sediment water from crude oil was investigated by means of electrochemical impedance spectroscopy, wire beam electrode, electrochemical measurements and SEM/XRD techniques. Results showed that during the initial immersion period of 21 d the carbon steel suffered from uniform corrosion and its corrosion rate decreased with time. Afterwards, the corrosion was transformed to localized corrosion and its corrosion rate increased with time during the period of 21~35 d of immersion. The fact can be explained that the carbon steel surface was covered by scale of CaCO₃, and the corrosion process can be hindered. However, corrosion pits were initiated and accelerated with increasing of time due to loss of corrosion protection from CaCO₃ deposits after 21 d.

Key words： sediment water of curde oil Q235B carbon steel corrosion wire beam electrode

收稿日期: 2016-10-27

基金资助: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) 及宁波市自然科学基金 (2016A610261)

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引用本文:

程庆利,陶彬,刘栓,刘全桢,张卫华,田松柏,王立平. 原油沉积水对Q235B碳钢的腐蚀影响[J]. 中国腐蚀与防护学报, 2017, 37(2): 126-134.
Qingli CHENG, Bin TAO, Shuan LIU, Quanzhen LIU, Weihua ZHANG, Songbai TIAN, Liping WANG. Corrosion Behaviour of Q235B Carbon Steel in Sediment Water From Crude Oil. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 126-134.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.212 或 https://www.jcscp.org/CN/Y2017/V37/I2/126

图1 10×10电极阵列及在模拟储罐底部沉积水环境下三电极测试腐蚀行为示意图

图2 在原油沉积水中浸泡不同时间过程中,Q235B碳钢的腐蚀产物形貌SEM像

图3 在原油沉积水中浸泡不同时间过程中, Q235B碳钢表面除去腐蚀产物后的腐蚀形貌SEM像

图4 Q235B碳钢在沉积水中浸泡35 d过程中腐蚀失重随时间的变化

图5 碳钢在沉积水中浸泡第35 d时,碳钢表面局部腐蚀产物的SEM像及EDS测试结果

图6 在沉积水中浸泡第35 d时,碳钢表面沉积物的XRD谱

图7 Q235B钢试样在原油沉积水中浸泡35 d过程中的EIS图

图8 Q235B碳钢在沉积水中浸泡不同时间后的EIS拟合等效电路图

图9 在原油沉积水中浸泡35 d过程中腐蚀速率1/Rct与时间的关系

图10 在不同时间下丝束电极表面电位和电流分布图

图11 在原油丝束电极表面局部腐蚀因子 (LF) 随时间的变化

图12 在沉积水中浸泡35 d后Q235B碳钢腐蚀机理图

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