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| Effect of NaCl on the Corrosion Behavior of 347H Stainless Steel and Ni-Based GH3539 Alloy in Molten Nitrate Salts |
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Cite this article:
. Effect of NaCl on the Corrosion Behavior of 347H Stainless Steel and Ni-Based GH3539 Alloy in Molten Nitrate Salts. Journal of Chinese Society for Corrosion and protection, 0, (): 0-0.
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Abstract The effect of NaCl on the corrosion behavior of 347H stainless steel and nickel-based GH3539 alloy in molten (Na,K)NO3 at 600℃ has been investigated. It is shown that the addition of NaCl could accelerate obviously the corrosion of 347H and GH3539 in the melt, with more significant effect observed for 347H. In molten (Na,K)NO3, 347H can form a Cr-rich scale, while GH3539 produces a layered products composed of external NiO, middle metallic Ni and inner internal oxidation layer. When NaCl is added in molten (Na,K)NO3, however, chlorine produced by the reaction between NaCl and oxides formed on the alloy surface can diffuse toward alloy matrix, giving rise to chlorination reaction of alloying elements. This chlorine corrosion weakens the bonding between the scale and alloy matrix, finally leading to the accelerated corrosion of both alloys with an enhanced effect obtained for a higher content of NaCl.
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Received: 12 March 2025
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| Fund: National Key R & D Program of China |
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