CO<sub>2</sub>环境下油酸咪唑啉对X65钢异种金属焊缝电偶腐蚀的抑制作用研究

doi:10.11902/1005.4537.2019.209

中国腐蚀与防护学报

2020, Vol. 40

Issue (2): 96-104 DOI: 10.11902/1005.4537.2019.209

研究报告

本期目录 | 过刊浏览

CO₂环境下油酸咪唑啉对X65钢异种金属焊缝电偶腐蚀的抑制作用研究

伊红伟¹, 胡慧慧¹, 陈长风¹(

), 贾小兰¹, 胡丽华²

1 中国石油大学 (北京) 新能源与材料学院北京 102249
2 中海油研究总院有限责任公司北京 100029

Corrosion Behavior and Corrosion Inhibition of Dissimilar Metal Welds for X65 Steel in CO₂-containing Environment

YI Hongwei¹, HU Huihui¹, CHEN Changfeng¹(

), JIA Xiaolan¹, HU Lihua²

1 School of New Energy and Materials, China University of Petroleum (Beijing), Beijing 102249, China
2 CNOOC Research Institute Co. , LTD, Beijing 100029, China

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摘要:

研究了X65管线钢与316L不锈钢、Inconel 625双金属复合管的异种金属焊缝在CO₂环境下的电偶腐蚀行为，以及油酸咪唑啉的缓蚀作用。结果表明，随着电偶电位差的增大，异种金属焊缝的腐蚀速率明显升高，并且都显著高于母材。添加油酸基咪唑啉缓蚀剂能降低异种金属焊缝在CO₂环境下的均匀腐蚀速率。但是，当缓蚀剂浓度添加较低时，异种金属焊接试样的碳钢一侧出现了严重的沟槽腐蚀或密集的点蚀坑；进一步增加缓蚀剂浓度才能消除沟槽腐蚀现象。讨论了缓蚀剂对异种金属焊缝电偶腐蚀的抑制机理，该项研究可为异金属焊接接头处的腐蚀防护提供借鉴。

关键词 ： CO₂腐蚀, 咪唑啉, 电偶腐蚀, 异金属焊接

Abstract：

The corrosion behavior of X65 pipeline steel, and the galvanic corrosion behavior of dissimilar metal welds of X65/316L stainless steel and X65/Inconel 625 in CO₂-containing environments, as well as the inhibition effect of imidazoline oleic acid corrosion inhibitor on the corrosion were assessed. The results show that with the increase of the potential difference of the galvanic couples, the corrosion rate of the weld seams for X65 steel with different metals increases obviously, and which is significantly higher than that of the base metal. The addition of oleic acid imidazoline corrosion inhibitor can reduce the uniform corrosion rate of the weld seams for X65 steel with different metals in CO₂-containing environment, but when the corrosion inhibitor concentration is low, serious groove corrosion or dense pitting pits appear on the X65 steel side of the welds for X65 steel with different metals. Further increase of corrosion inhibitor concentration can eliminate the phenomenon of groove corrosion. The electrochemical polarization curves and electrochemical impedance spectroscopy were used to analyze the inhibition mechanism of corrosion inhibitors on galvanic corrosion of dissimilar metal welds. This study can provide a reference for the corrosion protection of welding joints of dissimilar metals.

Key words： CO₂ corrosion imidazoline galvanic corrosion hetero-metal welding

收稿日期: 2019-11-12

ZTFLH:

TB37

基金资助:国家科技重大专项(2016ZX05057001)

通讯作者: 陈长风 E-mail: chen_c_f@163.com

Corresponding author: CHEN Changfeng E-mail: chen_c_f@163.com

作者简介: 伊红伟，男，1995年生，硕士生

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引用本文:

伊红伟, 胡慧慧, 陈长风, 贾小兰, 胡丽华. CO₂环境下油酸咪唑啉对X65钢异种金属焊缝电偶腐蚀的抑制作用研究[J]. 中国腐蚀与防护学报, 2020, 40(2): 96-104.
Hongwei YI, Huihui HU, Changfeng CHEN, Xiaolan JIA, Lihua HU. Corrosion Behavior and Corrosion Inhibition of Dissimilar Metal Welds for X65 Steel in CO₂-containing Environment. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 96-104.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.209 或 https://www.jcscp.org/CN/Y2020/V40/I2/96

表1 X65、316L不锈钢和Inconel 625合金的化学成分 (mass fraction / %)

图1 X65钢以及异种金属焊接材料在不同温度下的腐蚀速率

图2 未添加缓蚀剂异种金属焊缝腐蚀后的微观形貌

图3 X65和316L不锈钢、Inconel 625合金在模拟现场取出水中的腐蚀电位

图4 X65母材和3种金属焊缝试样在不同温度下添加30 μL/L缓蚀剂的模拟溶液中浸泡7 d后的腐蚀速率

表2 X65母材和3种金属焊缝试样在不同温度下添加30 μL/L缓蚀剂的模拟溶液中浸泡7 d后的缓蚀效率

图5 两种异种金属焊接试样在14和30 ℃下添加30 μL/L缓蚀剂的模拟现场取出水溶液中腐蚀7 d后的SEM像

图6 X65母材和3种金属焊缝试样在不同温度下添加50 μL/L缓蚀剂的模拟溶液中浸泡7 d后的腐蚀速率

表3 X65母材和3种金属焊缝试样在不同温度下添加50 μL/L缓蚀剂的模拟溶液中浸泡7 d后的缓蚀效率

图7 两种异种金属焊接试样在14和 30 ℃下添加50 μL/L缓蚀剂的模拟现场取出水溶液中腐蚀7 d后的SEM像

图8 X65母材和3种金属焊缝试样在不同浓度缓蚀剂的模拟现场取出水溶液中的极化曲线

图9 X65以及X65/X65，X65/316L不锈钢，X65/Inconel 625焊接试样在不同浓度缓蚀剂的模拟现场取出水溶液中的Nyquist图

图10 X65以及X65/X65，X65/316L不锈钢，X65/Inconel 625焊接试样在添加/不添加缓蚀剂的模拟现场采出水溶液中的EIS等效电路图

表4 EIS等效电路拟合参数

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