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Passivation technology of cast steel for chemical pump

A chemical pump, cast steel technology, applied in the direction of metal material coating process, etc., can solve the problem of poor corrosion resistance of cast steel, and achieve the effects of uniform passivation, increased hardness and good corrosion resistance

Inactive Publication Date: 2016-04-20
ANHUI WOLONG PUMP & VALVE CO LTD
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AI Technical Summary

Problems solved by technology

Anti-corrosion materials are also required when using the pump casing of chemical pumps, but generally cast steel has poor corrosion resistance. When preparing chemical pumps, cast steel needs to be treated to improve the corrosion resistance of cast steel castings

Method used

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Embodiment Construction

[0009] A passivation process for cast steel for chemical pumps, comprising the following steps:

[0010] (1), cast the cast steel into the desired shape, then polish the casting surface, then soak the casting in 1.5% sodium carbonate solution for 2 hours, and use a soft brush to brush the casting surface during the treatment;

[0011] (2) Rinse the castings treated in step (1) with clean water, and then use a nitric acid solution with a mass fraction of 1% to pickle the castings. The pickling time is 2-3 minutes. Ultrasonic treatment is used during the pickling process. 25kHz;

[0012] (3) Soak the castings treated above with 0.5% sodium bicarbonate solution for 15 minutes, then dry the castings at 42-50°C, and passivate the castings treated above with a passivating agent , the treatment temperature during passivation is 52-58°C, the passivation treatment time is 52-65s, and the passivation agent is made of the following raw materials by weight: 3.5 parts of 2-hydroxyethyl-1-...

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PUM

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Abstract

The invention relates to a passivation technology of cast steel for a chemical pump. The passivation technology comprises the following steps that (1) cast steel is cast into the required shape, then the surface of a cast piece is ground, and the cast piece is subjected to soaking treatment with a sodium carbonate solution of which the mass fraction is 1.5% for 2h, during which the surface of the cast piece is brushed by using a banister brush; (2) pickling is carried out; and (3) passivation treatment is carried out. The passivation technology of cast steel is simple; through carrying out cleaning, pretreatment and pickling treatment before passivation, the passivation effect is improved, the passivation is more uniform, and the density of a passivation layer is high; and the corrosion resistance of the cast piece can be improved greatly.

Description

technical field [0001] The invention belongs to the field of metal treatment, and in particular relates to a passivation process of cast steel for chemical pumps. Background technique [0002] Corrosion has always been one of the most troublesome hazards of chemical equipment. A little carelessness can damage the equipment, cause accidents or even disasters. According to relevant statistics, about 60% of the damage of chemical equipment is caused by corrosion. Therefore, when selecting chemical pumps, we must first pay attention to the scientific nature of material selection. Anti-corrosion materials are also required when using the pump casing of chemical pumps, but generally cast steel has poor corrosion resistance. When preparing chemical pumps, cast steel needs to be treated to improve the corrosion resistance of cast steel castings. Contents of the invention [0003] The object of the present invention is to provide a passivation process for cast steel used in chemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/33C23C22/78
CPCC23C22/33C23C22/78
Inventor 洪忠保程志强
Owner ANHUI WOLONG PUMP & VALVE CO LTD
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