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

doi:10.11902/1005.4537.2019.209

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

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

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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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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

Received: 12 November 2019

ZTFLH:

TB37

Fund: National Science and Technology Major Project of the Miristry of Science and Technology of China(2016ZX05057001)

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

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	Hongwei YI
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Cite this article:

YI Hongwei, HU Huihui, CHEN Changfeng, JIA Xiaolan, HU Lihua. 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.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.209 OR https://www.jcscp.org/EN/Y2020/V40/I2/96

Table 1 Chemical compositions of X65, 316L stainless steel and Inconel 625 alloy

Fig.1 Corrosion rates of X65 steel and three welding materials at different temperatures

Fig.2 SEM (a, c) and CLSM (b, d) images of the weld joints of X65/316L (a, b) and X65/Inconel 625 (c, d) after corrosion in simulated solution without inhibitor

Fig.3 Corrosion potentials of X65, 316L stainless steel and Inconel 625 alloy in the simulated on-site extraction water

Fig.4 Corrosion rate vs temperature curves for X65 and the weld joints of X65/X65, X65/316L and X65/Inconel 625 after immersion for 7 d in the simulated solution containing 30 μL/L inhibitor

Table 2 Corrosion inhibition efficiencies of four different samples after immersion for 7 d in the simulated solution containing 30 μL/L inhibitor at different temperatures

Fig.5 SEM images of X65/316L stainless steel (a, b) and X65/Inconel 625 (c,d) dissimilar metal welding samples after corrosion for 7 d in simulated on-site extraction water containing 30 μL/L inhibitor at 14 ℃ (a, c) and 30 ℃ (b, d)

Fig.6 Corrosion rate vs temperature curves of four different samples after immersion for 7 d in the simulated solution containing 50 μL/L inhibitor

Table 3 Corrosion inhibition efficiencies of four different samples after immersion for 7 d in the simulated solution containing 50 μL/L inhibitor at different temperatures

Fig.7 SEM images of X65/316L stainless steel (a, b) and X65/Inconel 625 (c,d) welding samples after immersion for 7 d in simulated extraction water with 50 μL/L inhibitor at 14 ℃ (a, c) and 30 ℃ (b, d)

Fig.8 Polarization curves of X65 (a) and the welding samples of X65/X65 (b), X65/316L stainless steel (c) and X65/Inconel 625 (d) in simulated extraction aqueous solutions with different concentrations of inhibitor

Fig.9 Nyquist plots of X65 (a) and the welding samples of X65/X65 (b), X65/316L stainless steel (c) and X65/Inconel 625 (d) in the simulated extraction aqueous solutions with different concentrations of inhibitor

Fig.10 EIS equivalent circuit diagrams of four different samples in the simulated extraction aqueous solutions without (a) and with (b) inhibitor

Table 4 Fitting parameters of EIS equivalent circuits

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