回火温度对Cr7钢耐CO<sub>2</sub>腐蚀性能的影响

doi:10.11896/cldb.20080053

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Abstract The static and dynamic corrosion rates of Cr7 steel after different tempering treatment in CO₂ environment were gained by high temperature autoclaving to accelerate corrosion tests. The microstructure and corrosion products of the samples were analyzed by SEM and XRD. The results show that the microstructure of Cr7 steel after tempering at different temperatures was tempered martensite, and the corrosion resistance decreased with the increase of tempering temperature. The static corrosion products were Cr(OH)₃ and FeCO₃, and the dynamic corrosion film surface was also attached with particles composed of FeCO₃ and CaCO₃. The results of scanning Kelvin probe and electron backscatter diffraction analysis showed that the potential difference of the sample after tempering at 200 ℃ and 500 ℃ was about 80 mV, and the potential difference of the sample after tempering at 600 ℃ increased to 118 mV. The merging of martensite laths during the tempering process leads to an increase in the proportion of high-angle grain boundaries, which leads to increased micro-region potential fluctuations, which is the main reason for the decline of the corrosion resistance of Cr7 steel.

Key words： medium Cr steel CO₂ corrosion tempered martensite high-angle boundary scanning Kelvin probe microcopy

Published: 30 September 2021

CLC number:

TG172.3

Fund:This work was financially supported by the National Key R&D Program of China (2017YFB0304900).

About author:: Yang Gu, the 2016 grade doctoral student at the Collaborative Innovation Center of Steel Technology of University of Science and Technology Beijing, mainly engaged in research on corrosion-resistant pipeline steel.

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	GU Yang
	SONG Shuai
	WU Huibi
	ZHANG Zhihui
	ZHANG Pengcheng

Cite this article:

GU Yang,SONG Shuai,WU Huibi, et al. Effect of Tempering Temperature on CO₂ Corrosion Resistance of Cr7 Steel[J]. Materials Reports, 2021, 35(18): 18176-18181.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20080053 OR http://www.mater-rep.com/EN/Y2021/V35/I18/18176

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