Influence of H2S Concentration and pH Value on Corrosion Behavior of Weld Joint of X65 Subsea Pipeline Steel

doi:10.11902/1005.4537.2013.124

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (3): 231-236 DOI: 10.11902/1005.4537.2013.124

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Influence of H₂S Concentration and pH Value on Corrosion Behavior of Weld Joint of X65 Subsea Pipeline Steel

XING Yunying, LIU Zhiyong, DU Cuiwei(

), LI Xiaogang, LIU Ranke, ZHU Min

Key Laboratory of Corrosion and Protection of Ministry of Education, Corrosion and Protection Center University of Science and Technology Beijing, Beijing 100083, China

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Abstract

With an autoclave the environment of submarine gathering system was simulated, then in which the influence of concentration of H₂S and pH value on the corrosion behavior of weld joints of X65 pipeline steel was investigated by electrochemical techniques, immersion test, SEM and XRD analysis technique. The results show that the free corrosion potential of different portion of the X65 pipeline steel weld joint exhibited a tendency of decrease, but the corrosion density of increase, corresponding to the following order as: the weld seam, the heat affected zone and the base material. The average corrosion rate of the steel weld joints is in the range of 0.1~0.25 mm/a, the increase of the concentration of H₂S and the reduction of the pH value can both lead to the increase of corrosion rate. The corrosion mode of weld seam of X65 steel is mainly the uniform corrosion in the simulated environment, and the corrosion of weld seam is slighter than that of the heat affected zone.

Key words: X65 steel weld joint submarine corrosion H₂S concentration pH value

Received: 07 August 2013

ZTFLH:

TG172.5

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	Yunying XING
	Zhiyong LIU
	Cuiwei DU
	Xiaogang LI
	Ranke LIU
	Min ZHU

Cite this article:

XING Yunying, LIU Zhiyong, DU Cuiwei, LI Xiaogang, LIU Ranke, ZHU Min. Influence of H₂S Concentration and pH Value on Corrosion Behavior of Weld Joint of X65 Subsea Pipeline Steel. Journal of Chinese Society for Corrosion and protection, 2014, 34(3): 231-236.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.124 OR https://www.jcscp.org/EN/Y2014/V34/I3/231

Fig.1

X65/焊缝界面显微组织

Fig.2

X65钢焊接接头在模拟溶液中的开路电位

Fig.3

X65钢焊接接头在模拟溶液中的极化曲线

Fig.4

模拟溶液中的Nyquist谱和等效电路

Fig.5

pH值为5, 温度为25 ℃, 流速为2 m/s条件下腐蚀不同时间后腐蚀速率与H₂S浓度的关系

Fig.6

温度25 ℃, H₂S浓度为1×10^-⁴, 流速2 m/s条件下腐蚀不同时间后腐蚀速率与溶液pH值的关系

Fig.7

不同模拟条件下去除腐蚀产物后试样表面的腐蚀形貌

Fig.8

腐蚀产物的XRD谱

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