In-situ magnesium oxide generation method for inhibiting corrosivity of chloride molten salt

Abstract

The invention relates to the technical field of corrosion prevention, in particular to an in-situ magnesium oxide generation method for inhibiting corrosion of chloride molten salt. The invention discloses an in-situ magnesium oxide generation method for inhibiting the corrosivity of chloride molten salt, magnesium oxide is generated on the molten salt by using magnesium chloride hexahydrate and is uniformly distributed on the molten salt, and then a long-term effective and uniform MgO protective layer is generated on the surface of the alloy. Compared with other methods for inhibiting molten salt corrosivity, the in-situ generated magnesium oxide protective layer can serve in a high-temperature environment for a long time to ensure that the matrix is not corroded, the operability is high, the experimental method is easy to implement and can be implemented on a large scale, and the method can be applied to a solar thermal power generation system in future to ensure stable operation of the system.

Description

technical field [0001] The invention relates to the technical field of anti-corrosion, in particular to an in-situ magnesium oxide generation method for inhibiting the corrosion of chloride molten salt. Background technique [0002] At present, the proportion of renewable energy consumption is increasing year by year, and solar energy is considered to be one of the most promising renewable energy sources. Compared with photovoltaic power generation, concentrated solar power generation is more suitable for power grid systems and has broader development prospects. Among them, the choice of heat transfer fluid and heat storage medium will directly affect the efficiency and cost of concentrated solar power generation. The chloride molten salt has the advantages of high heat capacity, low viscosity, low price, good thermal stability, and wide operating temperature range, and is suitable as a high temperature heat transfer and heat storage material for use in solar thermal power ...

AI Technical Summary

Problems solved by technology

But the α-Al used for protection 2 o 3 The phase requires a longer oxidation time and a higher oxidation temperature to form, and once the conditions are not controlled properly, it will generate metastable γ-Al with no corrosion inhibition effect 2 o 3 and θ-Al 2 o 3 , so it is difficult to protect metal materials stably; (2) Inhibit corrosion by controlling the atmosphere: research shows that the corrosion degree of the alloy in the inert atmosphere is lower than that in the reactive atmosphere, but because the change of the atmosphere is limited by factors such as the environment and cost, it is difficult to Scale realization; (3) Inhibiting corrosion by controlling temperature: Studies have shown that lowering the temperature can reduce the corrosion of chloride molten salts, but at the same time it will also affect the efficiency of thermoelectric systems and cannot generate electricity at high temperatures

Therefore, there are certain defects in various methods for reducing the corrosiveness of chloride molten salts, and generally cannot suppress the corrosiveness of chloride molten salts with high efficiency and low cost.

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