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Low-temperature oxygen-carbonitriding treating agent used for improving liquid metal corrosion resistance of stainless steel

A liquid metal, carbon-nitrogen-oxygen technology, applied in metal material coating process, solid-state diffusion coating, coating, etc., can solve the failure of cooling system, affect the mechanical and physical properties of materials, composition and surface morphology changes, etc. question

Inactive Publication Date: 2020-10-23
SICHUAN UNIV
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Problems solved by technology

Liquid metal corrosion leads to changes in the microstructure, composition and surface morphology of structural materials, which affects the mechanical and physical properties of the material, and eventually leads to failure of the material or even the entire cooling system

Method used

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  • Low-temperature oxygen-carbonitriding treating agent used for improving liquid metal corrosion resistance of stainless steel
  • Low-temperature oxygen-carbonitriding treating agent used for improving liquid metal corrosion resistance of stainless steel
  • Low-temperature oxygen-carbonitriding treating agent used for improving liquid metal corrosion resistance of stainless steel

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Embodiment Construction

[0024] A low-temperature carbonitriding treatment agent for improving the corrosion resistance of stainless steel to liquid metal in this embodiment consists of the following components by weight percentage: KCNO 35%, NaCNO 30%, K 2 CO 3 9%, Na 2 CO 3 8.5%, Li 2 CO 3 3%, NaOH6%, KOH 4%, Ce(OH) 3 3%, Na 2 SO4 0.2%, K 2 SO 4 0.3%. This embodiment is suitable for use under the process condition of 430°C, and the treatment agent is used in a stable environment. The metallographic results of the cross-section of 316L austenitic stainless steel after treatment at 430 °C and 8 hours are as follows: figure 1 As shown, the thickness of the bright white layer is 26.1 μm, and the microhardness of the surface layer reaches 1150HV0.1.

[0025] figure 2 It is the corrosion depth of 2000h of 316L austenitic stainless steel in liquid metal solution at 550°C. It can be seen that after the austenitic stainless steel is treated with a low-temperature carbonitriding treatment ag...

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Abstract

The invention relates to a low-temperature oxygen-carbonitriding treating agent used for improving liquid metal corrosion resistance of stainless steel. The low-temperature oxygen-carbonitriding treating agent comprises the following components in percentage by weight: 1%-55% of KCNO, 1%-55% of NaCNO, 8%-25% of K2CO3, 8%-25% of Na2CO3, 3%-35% of Li2CO3, 5%-15% of NaOH, 5%-15% of KOH, 0.1%-5% of Ce(OH)3, 0.1%-2% OF K2SO4 and 0.1%-2% of Na2SO4. Treatment temperature is 390-430 DEG C; and treatment time is 30-600 minutes. After treatment of the treating agent disclosed by the invention, the diffusion layer thickness and the liquid metal corrosion resistance of the stainless steel are improved.

Description

technical field [0001] The invention relates to a treatment agent applied to low-temperature liquid carbonitriding treatment of stainless steel. After the stainless steel is treated at low temperature by the treatment agent, the corrosion resistance of the material, especially the corrosion resistance in a liquid metal environment, is greatly improved. Background technique [0002] Corrosion of liquid metals is one of the serious problems of using liquid metals / alloys under high temperature conditions. Unlike corrosion in aqueous media, which is primarily an electrochemical process, corrosion of liquid metals such as lead and lead-bismuth alloys is a physical or physicochemical process involving dissolution of material components, transport of two phases (liquid and solid) , and the reaction between corrosion products and impurities. Liquid metal corrosion leads to changes in the microstructure, composition and surface morphology of structural materials, which affects the m...

Claims

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Application Information

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IPC IPC(8): C23C8/52
CPCC23C8/52
Inventor 王均
Owner SICHUAN UNIV
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