Corrosion of Electrode Materials in Joule Heated Melter

doi:10.11902/1005.4537.2021.118

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (3): 458-463 DOI: 10.11902/1005.4537.2021.118

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Corrosion of Electrode Materials in Joule Heated Melter

ZHANG Keqian, ZHANG Hua(

), LI Yang, HONG Ye, HE Cheng

China Institute of Atomic Energy, Beijing 102413, China

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Abstract

The corrosion of ceramic furnace electrode materials in molten glass is discussed from three aspects: material, temperature and applied current. The results show that Inconel 693 forms an Al₂O₃ scale in molten glass. The corrosion resistance of Inconel 693 is better than that of Inconel 690. With the change of temperature, the corrosion rate of the material is determined by the Cr diffusion rate inside the material and the Cr₂O₃ dissolution rate on the surface. In the presence of electric current, the passive film of Inconel alloy in molten glass is destroyed and its corrosion resistance becomes poor. It is also suggested that the corrosion behavior and the relevant corrosion mechanism of materials should be investigated in combination with the practical operation conditions of JHM in the future.

Key words: electrode material corrosion behavior molten glass joule heated melter

Received: 26 May 2021

ZTFLH:

TG172

Corresponding Authors: ZHANG Hua E-mail: zhanghua_32@ciae.ac.cn

About author: ZHANG Hua, E-mail: zhanghua_32@ciae.ac.cn

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Cite this article:

ZHANG Keqian, ZHANG Hua, LI Yang, HONG Ye, HE Cheng. Corrosion of Electrode Materials in Joule Heated Melter. Journal of Chinese Society for Corrosion and protection, 2022, 42(3): 458-463.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.118 OR https://www.jcscp.org/EN/Y2022/V42/I3/458

Fig.1 Corrosion of Inconel 625 alloy in molten borosil-icate glass^[4]

Table 1 Composition comparisons of Inconel 690 and Inconel 693 alloys^[5](mass fraction / %)

Fig.2 SEM micrographs of corrosion surface of Inconel 690 (a) and Inconel 693 (b) alloys^[12]

Fig.3 Corrosion of Inconel 693 alloy in borosilicate molten glass for 45 h (a), 144 h (b), 360 h (c) and metal matrix (d)^[13]

Fig.4 SEM image (a) and magnified image of area A (b) and B (c) in Fig.4a of Inconel 693 alloy corroded in 1000 ℃ iron phosphate glass for 7 d^[5]

Fig.5 SEM images of Inconel 690 (a) and Inconel 693 (b) alloys corroded in 1050 ℃ iron phosphate glass for 7 d^[5]

Fig.6 SEM images of corrosion of Inconel 693 alloy in iron phosphate glass solution: (a) static electrode corrosion test, (b) control group^[18]

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