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Treatment method for improving salt fog corrosion resistance of pump shaft of chemical pump

A treatment method and a corrosive technology are applied in the treatment field of improving the salt spray corrosion resistance of chemical pump shafts, which can solve the problem that the chemical pump shaft does not meet the requirements of salt spray corrosion resistance, and the performance of the chemical pump shaft affects the chemical pump. efficiency and other issues, to achieve the effect of improving the resistance to intergranular corrosion, inhibiting intergranular corrosion, and increasing the concentration of chromium

Inactive Publication Date: 2017-10-10
ANHUI LUYUAN PUMP&VALVE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The role of the chemical pump shaft is mainly to transmit power, and to support the impeller to maintain normal operation at the working position. The performance of the chemical pump shaft greatly affects the normal operation and working efficiency of the chemical pump. When the chemical pump outputs a large amount of chemical substances , there is an obvious requirement for the corrosion resistance of chemical pump shafts, and the salt spray corrosion resistance of chemical pump shafts is also an important standard, but the salt spray corrosion resistance of existing chemical pump shafts often fails to meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A treatment method for improving the salt spray corrosion resistance of a pump shaft of a chemical pump, comprising the following steps:

[0018] (1) Place the pump shaft in a resistance furnace to heat up for overall heat treatment, the heating temperature is 850°C, and then perform oil quenching; the pump shaft after oil quenching is subjected to high temperature tempering, the temperature of high temperature tempering is 510°C, heat preservation 138min, then rapid cooling, then conduct surface heat treatment on the pump shaft, heat the surface temperature of the pump shaft to 850°C, and water quench, then adjust the temperature of the pump shaft to 180°C, and then cool at room temperature;

[0019] (2) Put the above-mentioned pump shaft in the reaction furnace, open the exhaust port, raise the temperature of the furnace to 440°C, first pass in carbon dioxide to remove the oxygen in the furnace, and then pass in carbon dioxide and ammonia at the same time, and the carb...

Embodiment 2

[0028] A treatment method for improving the salt spray corrosion resistance of a pump shaft of a chemical pump, comprising the following steps:

[0029] (1) Place the pump shaft in a resistance furnace and heat it for overall heat treatment. The heating temperature is 860°C, and then perform oil quenching; the pump shaft after oil quenching is subjected to high temperature tempering. The temperature of high temperature tempering is 530°C. 138min, then rapid cooling, then conduct surface heat treatment on the pump shaft, heat the surface temperature of the pump shaft to 880°C, and water quench, then adjust the temperature of the pump shaft to 200°C, and then cool at room temperature;

[0030] (2) Put the above-mentioned pump shaft in the reaction furnace, open the exhaust port, raise the temperature of the furnace to 450°C, first pass in carbon dioxide to remove the oxygen in the furnace, and then pass in carbon dioxide and ammonia at the same time, and the carbon dioxide and am...

Embodiment 3

[0039] A treatment method for improving the salt spray corrosion resistance of a pump shaft of a chemical pump, comprising the following steps:

[0040] (1) Place the pump shaft in a resistance furnace and heat it for overall heat treatment. The heating temperature is 855°C, and then perform oil quenching; the pump shaft after oil quenching is subjected to high temperature tempering. The temperature of high temperature tempering is 520°C. 138min, then rapid cooling, then surface heat treatment of the pump shaft, heating the surface temperature of the pump shaft to 860°C, and water quenching, then adjusting the temperature of the pump shaft to 190°C, and then cooling at room temperature;

[0041] (2) Put the above-mentioned pump shaft in the reaction furnace, open the exhaust port, the temperature of the furnace rises to 445°C, first pass in carbon dioxide to remove the oxygen in the furnace, and then pass in carbon dioxide and ammonia at the same time, and the carbon dioxide an...

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Abstract

The invention discloses a treatment method for improving the salt spray corrosion resistance of chemical pump shafts, including: (1) heat treatment; (2) nitriding treatment; (3) strengthening treatment; (4) cleaning and drying; The corrosion resistance of the pump shaft has been significantly improved, especially the salt spray corrosion resistance has been significantly enhanced.

Description

technical field [0001] The invention belongs to the technical field of chemical pumps, and in particular relates to a treatment method for improving the salt spray corrosion resistance of chemical pump shafts. Background technique [0002] Chemical pumps are a general term for mechanical chemical pumps used to transport liquids and increase their pressure. They can meet the requirements of high temperature resistance, low temperature resistance, corrosion resistance, wear resistance, no leakage or less leakage, and pumps that can transport liquids in a critical state. These pumps are collectively referred to as chemical pumps. The role of the chemical pump shaft is mainly to transmit power, and to support the impeller to maintain normal operation at the working position. The performance of the chemical pump shaft greatly affects the normal operation and working efficiency of the chemical pump. When the chemical pump outputs a large amount of chemical substances , there is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/28C21D1/18C23C8/26
CPCC21D9/28C21D1/18C23C8/26
Inventor 凤元军
Owner ANHUI LUYUAN PUMP&VALVE CO LTD
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