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
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[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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