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Treatment method for improving acid corrosion resistance of chemical pump shaft

A treatment method and corrosive technology, which is applied in the treatment field of improving the acid corrosion resistance of chemical pump shafts, can solve the problems that the acid corrosion resistance of chemical pump shafts cannot meet the requirements, and the performance of chemical pump shafts affects the efficiency of chemical pumps. Achieve the effects of strengthening acid corrosion resistance, improving surface quality, and uniformly refining grains

Inactive Publication Date: 2017-11-03
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 acid corrosion resistance of chemical pump shafts is also an important standard, but the acid corrosion resistance of existing chemical pump shafts often fails to meet the requirements

Method used

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  • Treatment method for improving acid corrosion resistance of chemical pump shaft

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Embodiment 1

[0014] A treatment method for improving the acid corrosion resistance of a pump shaft of a chemical pump, comprising the following steps:

[0015] (1) First, the pump shaft is subjected to solid solution treatment in an electric furnace. The specific conditions of the solid solution treatment are to preheat at a heating rate of 200 °C / h to 400 °C for 36 minutes, and then at a heating rate of 80 °C / h The heating rate is heated to the treatment temperature of 1040°C, the treatment time is 72 minutes, and high-purity nitrogen gas is introduced at the 40th minute of treatment. A high-current pulsed ion beam composed of a mixed ion beam of 78 ns is used to irradiate the surface of the treated pump shaft. The number of irradiations is 2 times, the first irradiation time is 15s, the second irradiation time is 12s, and then Then cool the pump shaft at a cooling rate of 1.5 °C / s to 150 °C quickly, keep it warm for 56 minutes, then air cool to room temperature, and then heat the pump sh...

Embodiment 2

[0022] A treatment method for improving the acid corrosion resistance of a pump shaft of a chemical pump, comprising the following steps:

[0023] (1) First, the pump shaft is subjected to solid solution treatment in an electric furnace. The specific conditions of the solid solution treatment are to preheat at a heating rate of 200 °C / h to 420 °C for 36 minutes, and then at a heating rate of 80 °C / h The heating rate is heated to the treatment temperature of 1080°C, the treatment time is 72 minutes, and high-purity nitrogen gas is introduced at the 40th minute of treatment. A high-current pulsed ion beam composed of a mixed ion beam of 78 ns is used to irradiate the surface of the treated pump shaft. The number of irradiations is 2 times, the first irradiation time is 15s, the second irradiation time is 12s, and then Then cool the pump shaft at a cooling rate of 1.5 °C / s to 150 °C quickly, keep it warm for 56 minutes, then air cool to room temperature, and then heat the pump sh...

Embodiment 3

[0030] A treatment method for improving the acid corrosion resistance of a pump shaft of a chemical pump, comprising the following steps:

[0031] (1) First, the pump shaft is subjected to solid solution treatment in an electric furnace. The specific conditions of the solid solution treatment are to preheat at a heating rate of 200 °C / h to 410 °C for 36 minutes, and then at a heating rate of 80 °C / h The heating rate is heated to the treatment temperature of 1060 ° C, the treatment time is 72 minutes, and high-purity nitrogen gas is introduced at the 40th minute of treatment, and the pressure of nitrogen gas is 21 MPa. A high-current pulsed ion beam composed of a 78ns mixed ion beam is used to irradiate the surface of the treated pump shaft. The number of irradiations is 2 times, the first irradiation time is 15s, the second irradiation time is 12s, and then Then cool the pump shaft at a cooling rate of 1.5 °C / s to 150 °C quickly, keep it warm for 56 minutes, then air cool to r...

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Abstract

The invention discloses a treatment method for improving the acid corrosion resistance of chemical pump shafts, which includes: (1) solid solution treatment and irradiation treatment; (2) phosphating treatment; (3) cleaning and drying; after being treated by the method of the invention The high-quality pump shaft can fully dissolve the carbide and ferrite in the pump shaft material structure in the austenite matrix, thereby obtaining a single austenite structure, and greatly improving the corrosion resistance of the stainless steel pump shaft.

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 acid 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 are obviou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C23C22/73
CPCC21D9/00C23C22/73
Inventor 凤元军
Owner ANHUI LUYUAN PUMP&VALVE CO LTD
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