3Cr钢在含O<sub>2</sub>的CO<sub>2</sub>环境中的腐蚀行为研究

doi:10.11896/cldb.23070093

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Abstract The effects of dissolved oxygen on the CO₂ corrosion behavior of 3Cr steel were studied by immersion test and electrochemical test. SEM, EDS, XRD and XPS techniques were used to characterize and analyze corrosion product films. The results showed that the corrosion pro-duct film of 3Cr steel in the oxygen-free environment was relatively dense, and mainly composed of FeCO₃ and amorphous Cr(OH)₃ and Cr₂O₃, while in the oxygen-containing environment, under the influence of dissolved oxygen, the product film was loose and porous, and mainly composed of Fe₂O₃, Fe₃O₄ and CaCO₃, which created conditions for the occurrence of local corrosion. In the oxygen-containing environment, Fe(OH)₃ and Cr(OH)₃ competed for deposition on the surface of the matrix, which resulted in uneven distribution of Cr elements and pitting corrosion. Due to the difference in local protection, a small anode to a cathode corrosion couple pair was formed on the surface of the matrix, then the pitting corrosion rate increased. Electrochemical tests showed that the corrosion of 3Cr steel in both atmospheres was controlled by the cathodic reaction, with dissolved oxygen as the depolarizing agent and the cathodic reaction as oxygen absorption. The presence of dissolved oxygen increased the cathode mass transfer rate and self-corrosion current density, promoted the cathodic reaction, accelerated the dissolution of the anode, and reduced the film resistance and charge transfer resistance of the product and increased the corrosion rate.

Key words： 3Cr steel CO₂-O₂ corrosion dissolved oxygen corrosion behavior electrochemical impedance spectroscopy

Published: 10 December 2024 Online: 2024-12-10

CLC number:

TG174.2

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	Articles by authors
	WANG Fan
	ZHAO Guoxian
	FANG Kun
	PEI Wenxia
	DING Langyong
	LIU Ranran

Cite this article:

WANG Fan,ZHAO Guoxian,FANG Kun, et al. Study on Corrosion Behavior of 3Cr Steel in an O₂-containing CO₂ Environment[J]. Materials Reports, 2024, 38(23): 23070093-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23070093 OR http://www.mater-rep.com/EN/Y2024/V38/I23/23070093

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