Effect of Al/Si Content on Corrosion of Ni-based Alloys in Supercritical Water

doi:10.11902/1005.4537.2018.033

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (1): 68-76 DOI: 10.11902/1005.4537.2018.033

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Effect of Al/Si Content on Corrosion of Ni-based Alloys in Supercritical Water

Dongbai XIE¹,Youyu ZHOU²,Jintao LU³,Wen WANG²(

),Shenglong ZHU²,Fuhui WANG⁴

1. Department of Forensic Science and Technology, Xinjiang Police College, Urumqi 830011, China
2. Laboratory of Corrosion and Protection, Institue of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. National Energy R&D Center of Clean and High-efficiency Fossil-fired Power Generation Technology, Xi′an Thermal Power Research Institute Co., Ltd., Xi′an 710032, China
4. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

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Abstract

The oxidation behavior of four Ni-Fe-xCr based alloys with different contents of Al/Si was studied in supercritical water at 700 ℃ under 25 MPa. Oxidation kinetics of the alloys was obtained after 200 h exposure. The surface oxide scales were characterized by SEM/EDS and XRD. The results showed that a protective chromia scale formed as the content of Cr increased up to 25% (mass fraction), which was stable during the test. The strengthening phase element-Si was beneficial to the quick formation of protective chromia scale, meanwhile the Al showed little effect on the stability of protective chromia scale.

Key words: Ni-based alloy Al/Si content supercritical water high temperature oxidation

Received: 19 March 2018

ZTFLH:

TG172

Fund: Specific Fundamental Research Program for Strengthening Police with Science and Technology of the Ministry of Public Security(2017GABJC11);Key Laboratory of Impression Evidence Examination and Identification Technology, Ministry of Public Security, People's Republic of China and Research Found of Xi'an Thermal Power Research Institute Co., Ltd.

Corresponding Authors: Wen WANG E-mail: wen@imr.ac.cn

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Cite this article:

Dongbai XIE,Youyu ZHOU,Jintao LU,Wen WANG,Shenglong ZHU,Fuhui WANG. Effect of Al/Si Content on Corrosion of Ni-based Alloys in Supercritical Water. Journal of Chinese Society for Corrosion and protection, 2019, 39(1): 68-76.

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https://www.jcscp.org/EN/10.11902/1005.4537.2018.033 OR https://www.jcscp.org/EN/Y2019/V39/I1/68

Table 1 Nominal compositions of four test nickle-based alloys (mass fraction / %)

Fig.1 Oxidation kinetics curves of the alloys in supercritical water

Fig.2 XRD patterns of 20Cr9Al (a), 20Cr13Al (b), 25Cr5Si (c) and 25Cr2Si (d) after oxidation in supercritical water for 50 and 200 h

Fig.3 Surface morpholoigies of 20Cr9Al (a) and 20Cr13Al (b) after 25 h exposure in supercritical water and local EDS analysis results of areas I (c), II (d), in Fig.3a, III (e), IV (f) and V (g) in Fig.3b

Fig.4 Surface morpholoigies of 20Cr9Al (a) and 20Cr13Al (b) after 100 h exposure in supercritical water and local EDS analysis results of areas I (c), II (d) in Fig.4a and III (e) in Fig.4b

Fig.5 Surface morpholoigies of 25Cr5Si (a) and 25Cr2Si (b) after 25 h exposure in supercritical water and local EDS analysis results of areas I (c), II (d), III (e) in Fig.5a, IV (f) and V (g) in Fig.5b

Fig.6 Surface morpholoigies of 25Cr5Si (a) and 25Cr2Si (b) after 100 h exposure in supercritical water and local EDS analysis results of areas I (c), II (d) in Fig.6a, III (e) and IV (f) in Fig.6b

Fig.7 Cross-sectional morphology and elements profiles of 20Cr9Al alloy after 200 h exposure in supercritical water

Fig.8 Cross-sectional morphology and elements profiles of 20Cr13Al alloy after 200 h exposure in supercritical water

Fig.9 Cross-sectional and elements profiles of 25Cr5Si alloy after 200 h exposure in supercritical water

Fig.10 Cross-sectional morphologies of 25Cr2Si alloy after 50 h (a) and 200 h (b) exposure in supercritical water

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