Corrosion Behavior of Enamel Coatings in Molten Salts MgCl2-KCl-NaCl at 600 oC

doi:10.11902/1005.4537.2024.186

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (1): 155-163 DOI: 10.11902/1005.4537.2024.186

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Corrosion Behavior of Enamel Coatings in Molten Salts MgCl₂-KCl-NaCl at 600 ^oC

YANG Xiaodong¹, LI Xue², YU Zheng²(

), YANG Shasha², CHEN Minghui², WANG Fuhui²

1 State Administration of Science, Technology and Industry for National Defence, Beijing 100039, China
2 Corrosion and Protection Center, Northeastern University, Shenyang 110819, China

Cite this article:

YANG Xiaodong, LI Xue, YU Zheng, YANG Shasha, CHEN Minghui, WANG Fuhui. Corrosion Behavior of Enamel Coatings in Molten Salts MgCl₂-KCl-NaCl at 600 ^oC. Journal of Chinese Society for Corrosion and protection, 2025, 45(1): 155-163.

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Abstract

Three enamel coatings with identical total quantities of flux Na₂O, K₂O, and B₂O₃, but varying B₂O₃ mass fractions (11.78%, 14.78% and 17.78%) were prepared on on T92 ferritic steel. Their corrosion behaviorwas studied in molten salts MgCl₂-NaCl-KCl at 600 ^oC in air. Results show that the corrosion severity of the enamel coatings gradually decreases with the increasing amount of B₂O₃ in enamels. After corrosion for 500 h, the enamel coating with the lowest mass fraction of B₂O₃ (11.78%) suffered from a thickness loss of about 82 μm and a mass loss of about 14.44 mg/cm² under the combined action of physical dissolution and chemical attack of corrosive salts. Meanwhile, under the action of continuously generated gaseous corrosion products inside the coating, the coating was swelled, as a result, its thickness is expanded from 82.7 ± 0.5 μm of the original to 253.9 ± 44.9 μm. By increasing B₂O₃ content to 14.78%, the thickness- and mass-loss of the enamel coating were significantly reduced to about 12 μm and 3.69 mg/cm² respectively, while the volume expansion caused by rapid corrosion is eliminated. Comparatively, the enamel coating with the highest mass fraction of B₂O₃ (17.78%) showed excellent corrosion resistance with a thickness loss of less than 1 μm, and mass loss is eventually reduced to only 0.16 mg/cm².

Key words: enamel coating T92 steel corrosion melt chloride salts

Received: 17 June 2024 32134.14.1005.4537.2024.186

ZTFLH:

TG17

Fund: Liaoning Revitalization Talents Program(XLYC2203133);Fundamental Research Funds for Central Universities(N2302018);Ningbo Yuyao City Science and Technology Plan Project

Corresponding Authors: YU Zheng, E-mail: yuzheng_199501@163.com

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	YANG Xiaodong
	LI Xue
	YU Zheng
	YANG Shasha
	CHEN Minghui
	WANG Fuhui

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.186 OR https://www.jcscp.org/EN/Y2025/V45/I1/155

Table 1 Nominal compositions of three enamel coatings

Fig.1 DSC curves of the enamel powders with different compositions (a) and XRD patterns of three as-prepared enamel coatings (b) (T_g—glass transition temperature)

Fig.2 Cross-sectional and surface SEM images of as-prepared B12 (a), B15 (b) and B18 (c) enamel coatings

Fig.3 Macro images of B12 (a, d), B15 (b, e) and B18 (c, f) enamel coatings before (a-c) and after (d-f) hot corrosion in MgCl₂-KCl-NaCl molten salt at 600 ^oC for 500 h

Fig.4 Mass losses of three enamel coatings after hot corrosion in molten MgCl₂-KCl-NaCl at 600 ^oC for 500 h

Fig.5 XRD spectra of three enamel coatings after hot corrosion in molten MgCl₂-KCl-NaCl at 600 ^oC for 500 h

Fig.6 Low- (a, d, g) and high- (b, c, e, f, h, i) magnification surface SEM images of B12 (a-c), B15 (d-f) and B18 (g-i) enamel coatings after hot corrosion in molten MgCl₂-KCl-NaCl at 600 ^oC for 500 h

Table 2 EDS analyses of the regions marked with 1-5 in Fig.6

Fig.7 Cross-sectional SEM images of B12 (a), B15 (b) and B18 (c) enamel coatings after hot corrosion in molten MgCl₂-KCl-NaCl at 600 ^oC for 500 h

Fig.8 Profiles of the EDS point analysis results for B15 (a) and B18 (b) enamel coatings after hot corrosion in molten MgCl₂-KCl-NaCl at 600 ^oC for 500 h

Fig.9 3D surface images of B12 (a), B15 (b) and B18 (c) enamel coatings after hot corrosion in molten MgCl₂-KCl-NaCl at 600 ^oC for 500 h

Fig.10 Thermodynamic data of various relevant reactions for as-prepared enamel coatings

Fig.11 Schematic diagrams of hot corrosion of B12 and B18 enamels

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