Effect of NaCl on Hot Corrosion Behavior of 347H Stainless Steel and Ni-based GH3539 Alloy in Molten Nitrate Salts

doi:10.11902/1005.4537.2025.082

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (6): 1610-1618 DOI: 10.11902/1005.4537.2025.082

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Effect of NaCl on Hot Corrosion Behavior of 347H Stainless Steel and Ni-based GH3539 Alloy in Molten Nitrate Salts

PENG Wang¹^,², CHEN Jian¹, YANG Lingxu², LIU Huijun²(

), LIANG Jianping³, ZENG Chaoliu²(

)

1 College of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China
2 Songshan Lake Materials Laboratory, Dongguan 523808, China
3 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

Cite this article:

PENG Wang, CHEN Jian, YANG Lingxu, LIU Huijun, LIANG Jianping, ZENG Chaoliu. Effect of NaCl on Hot Corrosion Behavior of 347H Stainless Steel and Ni-based GH3539 Alloy in Molten Nitrate Salts. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1610-1618.

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Abstract

The effect of NaCl on the corrosion behavior of 347H stainless steel and GH3539 nickel-based alloy in molten (Na, K)NO₃ at 600 ^oC has been investigated. It is shown that the addition of NaCl can markedly accelerate the corrosion of 347H and GH3539 in the melt, with a more pronounced effect on 347H. In molten (Na, K)NO₃, 347H can form a Cr-rich oxide scale, while GH3539 produces layered products composed of an outer NiO, a middle metallic Ni, and an inner internal oxidation layer. When NaCl is added to molten (Na, K)NO₃, chlorine produced by the reaction between NaCl and oxides formed on the alloy surface diffuses into the alloy matrix, giving rise to chlorination reactions of alloying elements. This chlorine-induced corrosion weakens the bonding between the oxide scale and the alloy matrix, ultimately leading to accelerated corrosion of both alloys, with the effect enhanced by higher NaCl content.

Key words: hot corrosion 347H stainless steel GH3539 nickel-based alloy nitrate salts chloride salts

Received: 11 March 2025 32134.14.1005.4537.2025.082

ZTFLH:

TG174.4

Fund: National Key R & D Program of China(2021YFB3700603)

Corresponding Authors: LIU Huijun, E-mail: hui_jun_liu@163.comZENG Chaoliu, E-mail: clzeng@imr.ac.cn

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.082 OR https://www.jcscp.org/EN/Y2025/V45/I6/1610

Table 1 Chemical compositions of 347H stainless steel and GH3539 alloy (mass fraction / %)

Fig.1 Mass loss curves of 347H stainless steel (a) and GH3539 alloy (b) in molten (Na, K)NO₃ with and without NaCl at 600 ^oC under atmospheric condition

Fig.2 XRD patterns of 347H stainless steel (a) and GH3539 alloy (b) after hot corrosion in molten (Na, K)NO₃ at 600 ^oC for 1000 h

Fig.3 XRD patterns of 347H stainless steel (a) and GH3539 alloy (b) after hot corrosion in molten (Na, K)NO₃-1%NaCl at 600 ^oC for different time

Fig.4 Cross-sectional morphologies of 347H stainless steel after corrosion in molten (Na, K)NO₃ at 600 ^oC for 1000 h (a, b)

Fig.5 Cross-sectional morphologies of 347H stainless steel corroded in molten (Na, K)NO₃-1%NaCl at 600 ^oC for 100 h (a, b)

Fig.6 Cross-sectional morphologies of 347H stainless steel after hot corrosion in molten (Na, K)NO₃-1%NaCl at 600 ^oC for 250 h (a, b), 400 h (c, d), 600 h (e, f) and 1000 h (g, h)

Fig.7 Cross-sectional morphologies of 347H stainless steel after hot corrosion in molten (Na, K)NO₃-5%NaCl at 600 ^oC for 100 (a-c) and 400 h (d-f)

Fig.8 Cross-sectional morphologies of GH3539 alloy after hot corrosion in molten (Na, K)NO₃ at 600 ^oC for 1000 h (a, b)

Fig.9 Cross-sectional morphologies of GH3539 alloy after hot corrosion in molten (Na, K)NO₃-1%NaCl at 600 ^oC for 100 (a,b), 400 (c, d) and 600 (e, f)

Fig.10 Cross-sectional morphologies of GH3539 alloy after hot corrosion in molten (Na, K)NO₃-5%NaCl at 600 ^oC for 100 h (a, b) and 400 h (c, d)

Fig.11 Thermodynamic stability diagram of W-Cl₂-O₂ system at 600 ^oC

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