Corrosion of SiC induced by Hastelloy N alloy and its corrosion products in LiF–NaF–KF molten salt

Yang, Xinmei; Zhang, Dongsheng; Liu, Min; Feng, Song; Xue, Wandong; Liu, Huajian; Yu, Ge; Xiao-Hong, Zhou; Xia, Hao; Huai, Ping; Li, Zhijun; Lu, Yao; Zhou, Haijun; Dong, Shaoming

doi:10.1016/j.corsci.2016.03.029

Cited by 40 publications

(7 citation statements)

References 30 publications

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“…Contrary to the well-established opinion about the instability of the oxide layer in the melt of halides [ 18 , 19 , 20 , 21 , 22 , 23 ], in particular fluorides, a number of works have been published [ 24 , 25 , 26 , 27 , 28 , 29 ] in which there is information about a significant increase in the resistance of the structural material due to the formation of a spinel-type oxide layer on the surface that inhibits the course of the corrosion process.…”

Section: Introductionmentioning

confidence: 73%

High-Temperature Passivation of the Surface of Candidate Materials for MSR by Adding Oxygen Ions to FLiNaK Salt

et al. 2022

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The problem of tailoring the structural materials for MSR is solved by continuously overcoming the shortcomings of widely used materials and finding new ones. The materials commonly used in engineering may not be applicable for MSR due to their high corrosivity. Experiments were carried out to determine the corrosion rate of stainless steel 12Cr18Ni10Ti with different concentrations of oxide ions (by adding lithium oxide to the melt in the concentration range from 0 to 0.8 wt.%) in a FLiNaK melt. The formation of a protective oxygen-containing layer with a thickness of 1 micron has been realized. The corrosion rate decreases by an order of magnitude at the concentration of oxygen anions in the melt, in the range from 0.2 to 0.4% by weight, which may indicate high-temperature passivation of the material due to modification of the composition of the fluoride melt and reduction in its corrosion activity. In addition, the corrosion type of stainless steel in fluoride melts changes from the intercrystalline and pitting that is usually harmful to reactor material structure to total corrosion when lithium oxide is added. This is due to the “healing” of individual corrosion defects formed on the surface of the studied material by oxygen-containing compounds.

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Section: Introductionmentioning

confidence: 73%

High-Temperature Passivation of the Surface of Candidate Materials for MSR by Adding Oxygen Ions to FLiNaK Salt

et al. 2022

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“…Studies have shown that intentionally added impurities (such as Ni, Cr ions, etc.) to molten FLiNaK salt, led to a higher mass loss and increased corrosion for SiC [77,78]. Yang et al reported the possibility of Ni reacting with Si in the salt to form NiSi and Ni 31 Si 12 on the surface of Hastelloy N alloy that can drive the dissolution of Si from SiC into salt and alloy.…”

Section: Subtask 42: Identify Key Degradation Mechanisms Of Chosen Ma...mentioning

confidence: 99%

Development of an Open-source Alloy Selection and Lifetime Assessment Tool for Structural Components in CSP

Pillai¹,

Romedenne²,

Lee³

2022

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“…The molten glass corrosion is similar to that caused by the molten salt [1,2], where metallic elements are easily oxidized by the dissolved oxygen or other oxidizing agents in glass [3,4], for example, Fe 3+ . Meanwhile, the reaction products are normally non-protective due to the high solubility in melts and a flowing of molten glass.…”

Section: Introductionmentioning

confidence: 98%

Effect of alloyed Al on the corrosion behaviour of Ni-base alloys in molten glass under static condition

Yan

Sun

2016

Corrosion Science

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Ni-base alloys with different Al contents of 0-10 wt. % were designed and the corrosion behaviour was evaluated by static immersion in molten glass at 1050 °C.Results indicate that a small amount of Al (2-5 wt.%) is advantageous to mitigate the corrosion of the commercial Ni-base alloy, whereas further increase of Al content (8-10 wt.%) accelerates the corrosion process. In Al-added alloys, the corrosion of Cr element is suppressed by the Al dissolution, and the formation of inner alumina in high Al alloys leads to the surface exfoliation. The corrosion mechanism strongly depends on the Al content in alloys.

show abstract

Corrosion of SiC induced by Hastelloy N alloy and its corrosion products in LiF–NaF–KF molten salt

Cited by 40 publications

References 30 publications

High-Temperature Passivation of the Surface of Candidate Materials for MSR by Adding Oxygen Ions to FLiNaK Salt

High-Temperature Passivation of the Surface of Candidate Materials for MSR by Adding Oxygen Ions to FLiNaK Salt

Development of an Open-source Alloy Selection and Lifetime Assessment Tool for Structural Components in CSP

Effect of alloyed Al on the corrosion behaviour of Ni-base alloys in molten glass under static condition

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