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Preparation method for corrosion-resistant spiral centrifugal impeller

A centrifugal and corrosion-resistant technology, used in anti-corrosion coatings, coatings, melt spraying, etc., can solve the problem of affecting the service life of pumps in the normal operation of drainage pumping stations, increasing energy consumption per unit of pumping and discharging, and consuming manpower, material and financial resources. and other problems, to achieve the effect of improving strength and anti-leakage, preventing axial play or jumping, and improving yield

Inactive Publication Date: 2017-10-24
ANHUI LUYUAN PUMP&VALVE CO LTD
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  • Application Information

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Problems solved by technology

[0002] At present, large and medium-sized drainage pumping stations have the actual problem of corrosion of the impeller of the pump during operation, which directly affects the economic and social benefits of the pumping station. The metal corrosion of the impeller reduces the performance of the pump and increases the unit pumping capacity. At the same time, the frequent maintenance of the water pump due to corrosion increases the cost of equipment maintenance, which not only consumes a lot of manpower, material resources, and financial resources, but also affects the normal operation of the drainage pump station and the service life of the pump. Therefore, it is necessary to completely solve the problem of water pumps. For impeller corrosion problems, various anti-corrosion measures should be studied in depth to improve the comprehensive anti-corrosion performance of the impeller surface

Method used

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Embodiment 1

[0014] A method for preparing a corrosion-resistant spiral centrifugal impeller, comprising the following:

[0015] (1) Pouring is performed by low-pressure casting, the pouring temperature is 640-680°C, the preheating temperature of the plaster mold is 226-256°C, the preheating temperature of the cold iron is 180-195°C, and the pressure increase rate is 4kPa / s;

[0016] (2) Precipitate cobalt-based alloy powder by self-melting alloy spraying method, the thickness of the molten layer is 0.5mm, the fineness of cobalt-based alloy powder is less than 800nm, and the mass percentage of each component of cobalt-based alloy powder is C: 1.2-1.6%, Cr :18-22%, Y:2~4%, W:2~4%, Mo:0.6~1.4%, Ni:0.2~0.4%, Si:0.8~1.4%, B:0.4~1.6%, Fe: 0.4~1.6%, Hf: 0.1~0.2%, Co: balance;

[0017] (3) Carry out two impregnation treatments with the impregnation solution, and then conduct treatment in a high-temperature vacuum heat treatment equipment. The vacuum state is 720-750mmHg, and the temperature and ...

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Abstract

The invention belongs to the technical field of centrifugal pump impeller manufacturing, and particularly relates to a preparation method for a corrosion-resistant spiral centrifugal impeller. A low pressure casting mode is adopted for pouring, so that the yield of spiral centrifugal impeller castings can be improved, the surface roughness conforms to the requirements of Ra3.2, and a good foundation is provided for subsequent cobalt-base alloy powder fusion treatment; a self-fusion alloy spray method for precipitating cobalt-base alloy powder enables a coating to be tightly adhered to the surface of a matrix without damaging substrate materials, the strength of the impeller is improved, and the higher corrosion resistance and abrasion resistance of the impeller can be improved; and dipping treatment for liquor dipping can further improve the strength and seepage resistance of the impeller and plays a sealing role in the surface of the impeller, meanwhile, the surface of the impeller is smooth and even, axial movement or bouncing of a pump is prevented in the use process, the problem of poor corrosion resistance of the impeller is effectively solved, the temperature resistance is good, the usage temperature can reach 120 DEG C, the pump can operate stably, and the service life of the pump is prolonged.

Description

technical field [0001] The invention belongs to the technical field of manufacturing impellers of centrifugal pumps, and in particular relates to a method for preparing corrosion-resistant spiral centrifugal impellers. Background technique [0002] At present, large and medium-sized drainage pumping stations have the actual problem of corrosion of the impeller of the pump during operation, which directly affects the economic and social benefits of the pumping station. The metal corrosion of the impeller reduces the performance of the pump and increases the unit pumping capacity. At the same time, the frequent maintenance of the water pump due to corrosion increases the cost of equipment maintenance, which not only consumes a lot of manpower, material resources, and financial resources, but also affects the normal operation of the drainage pump station and the service life of the pump. Therefore, it is necessary to completely solve the water pump For impeller corrosion proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/04C23C4/06C22C19/07C09D161/32C09D5/18C09D5/08C09D7/12
CPCB22D18/04C08K5/05C08K5/14C09D5/08C09D5/18C09D161/32C22C19/07C23C4/06
Inventor 凤元军
Owner ANHUI LUYUAN PUMP&VALVE CO LTD
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