Corrosion Behavior of Four Corrosion-resistant Alloys in Ultra-supercritical Boiler Flue Gas Condensate

doi:10.11902/1005.4537.2021.004

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (4): 493-500 DOI: 10.11902/1005.4537.2021.004

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Corrosion Behavior of Four Corrosion-resistant Alloys in Ultra-supercritical Boiler Flue Gas Condensate

ZHAO Kang, LI Xiaoqi, WANG Mingtao, LIU Yuxi, JIANG Huawei, YANG Qirong, WANG Liwei(

)

School of Electromechanic Engineering, QingDao University, Qingdao 266071, China

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Abstract

The corrosion behavior of four anticorrosion alloys, including 316L stainless steel, 254SMo stainless steel, C276 alloy and Inconel 740H alloy, in an artificial flue-gas condensate of pH 1.09 which aims to simulate the flue-gas condensate of ultra-supercritical boilers, is studied by means of open-circuit potential- and potentiodynamic polarization curve-measurement, as well as electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy. It shows that all the four alloys exhibit passivation characteristics in the artificial flue-gas condensate. The deterioration process of the formed passive films by the aggressive ions in the flue-gas condensate is different for the four alloys with individually unique chemical composition. Among them, the passivation current density is the lowest and the polarization resistance is the highest for 254SMo stainless steel, which may be ascribed to that the formed passive film of high quality contains high Cr content, and appropriate amount of Mo and Ni on 254SMo stainless steel.

Key words: corrosion-resistant alloy flue gas condensate corrosion passivation

Received: 09 January 2021

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51701102)

Corresponding Authors: WANG Liwei E-mail: ustbwangliwei@126.com

About author: WANG Liwei, E-mail:ustbwangliwei@126.com

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	Kang ZHAO
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	Qirong YANG
	Liwei WANG

Cite this article:

ZHAO Kang, LI Xiaoqi, WANG Mingtao, LIU Yuxi, JIANG Huawei, YANG Qirong, WANG Liwei. Corrosion Behavior of Four Corrosion-resistant Alloys in Ultra-supercritical Boiler Flue Gas Condensate. Journal of Chinese Society for Corrosion and protection, 2021, 41(4): 493-500.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.004 OR https://www.jcscp.org/EN/Y2021/V41/I4/493

Table 1 Chemical compositions of the four materials (mass fraction / %)

Fig.1 Potentiodynamic polarization curves of four materials in simulated desulfurized flue gas condensates

Fig.2 Long-term open circuit potential of different materials in simulated desulfurized flue gas condensates

Fig.3 Nyquist (a) and Bode (b) plots of four materials in simulated desulfurized flue gas condensates

Table 2 Fitted electrochemical parameters for EIS of four materials

Fig.4 Detailed XPS spectra of O 1s of the passive film of 254SMo stainless steel (a), 316L stainless steel (b), Inconel 740H alloy (c) and C276 alloy (d)

Fig.5 Detailed XPS spectra of Fe 2p_3/2 of the passive film of 254SMo stainless steel (a), 316L stainless steel (b), Inconel 740H alloy (c) and C276 alloy (d)

Fig.6 Detailed XPS spectra of Cr 2p_3/2 of the passive film of 254SMo stainless steel (a), 316L stainless steel (b), Inconel 740H alloy (c) and C276 alloy (d)

Fig.7 Detailed XPS spectra of Mo 3d of the passive film of 254SMo stainless steel (a), 316L stainless steel (b), Inconel 740H alloy (c) and C276 alloy (d)

Fig.8 Detailed XPS spectra of Ni 2p_3/2 of the passive film of 254SMo stainless steel (a), 316L stainless steel (b), Inconel 740H alloy (c) and C276 alloy (d)

Fig.9 Fractions of the difference species in the passive film: (a) metallic oxide/hydroxide, (b) oxygen-containing species

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