Pretreatment method for oxygen blowing welded pipe before welded pipe aluminizing processing

A pretreatment and welded pipe technology, which is applied in the direction of using liquid cleaning methods, cleaning methods and utensils, chemical instruments and methods, etc., can solve the problems of general treatment effect and splashing of molten aluminum, so as to avoid splashing of molten aluminum and prolong the service life , enhance the effect of corrosion resistance

Inactive Publication Date: 2016-10-12
安徽鹏远金属制品股份有限公司
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AI Technical Summary

Problems solved by technology

However, the current pretreatment method is simple to operate, and the treatment effect is average. After the treatment, there are still some rust spots on the surface of the welded pipe, and the phenomenon of aluminum liquid splashing is prone to occur when hot dipping aluminum.

Method used

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Embodiment Construction

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0018] (1) Dust removal and one-time degreasing: Prepare cleaning solution, immerse the welded pipe in a cleaning tank with cleaning solution at 50-55 °C, lift it after 15 minutes, and drain the cleaning solution above the cleaning tank;

[0019] Preparation of cleaning solution: add 8kg bean dregs, 3kg tea seed powder and 2kg eggshell powder to 100kg water, soak for 30min, then microwave at microwave frequency 2450MHz, power 700W for 10min, then add 15kg activated clay, 10kg zeolite powder, 5kg carbo Resin and 1kg calamine powder, the mixture is fed into a ball mill for ball milling, passed through a 170 mesh sieve, and finally, 8kg hydroxyethyl cellulose, 6kg castor oil, 4kg polyethylene oxide and 3kg polyvinylpyrrolidone are added to the fi...

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Abstract

The invention discloses a pretreatment method for an oxygen blowing welded pipe before welded pipe aluminizing processing and relates to the technical field of welded pipe processing. The pretreatment method comprises the following steps of (1) dedusting and primary deoiling; (2) primary washing; (3) secondary deoiling; (4) primary acid pickling; (5) secondary washing; (6) secondary acid pickling; (7) auxiliary plating; and (8) drying. According to the pretreatment method for the oxygen blowing welded pipe before welded pipe aluminizing processing, dust and oil stains attached to the welded pipe are effectively removed through dedusting and two times of deoiling, and the using problem of high energy consumption caused by high-temperature drying and deoiling can be solved; then, washing agents and rust spots are removed through two times of washing and two times of acid pickling; and finally a layer of protection film is formed on the surface of the welded pipe through auxiliary plating and drying so that oxidation and rustiness before aluminizing can be prevented, and molten aluminum splashing during hot aluminizing is avoided.

Description

Technical field: [0001] The invention relates to the technical field of welded pipe processing, in particular to a pretreatment method for welded pipes before aluminizing processing of oxygen-blown welded pipes. Background technique: [0002] Oxygen-blowing welded pipes are used for steelmaking and oxygen-blowing pipes. Generally, small-diameter welded steel pipes are used. The specifications range from 3 / 8 inch to 2 inch, and are made of 08, 10, 15, 20 or Q195-Q235 steel strips. In order to prevent corrosion, some are aluminized. Before the aluminizing process, the welded pipe needs to be pretreated. On the one hand, the purpose is to remove the oil, dust and rust stains attached to the welded pipe; surface, and can form a protective film on the surface of the welded pipe to prevent oxidation and rust before aluminizing. However, the pretreatment method currently used is simple to operate and the treatment effect is average. Some rust spots still remain on the surface of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/02C23C2/12C23C2/38C23G1/24C23G1/08B08B3/02B08B3/08B08B7/00
CPCB08B3/02B08B3/08B08B7/0071C23C2/02C23C2/12C23C2/38C23G1/08C23G1/081C23G1/24
Inventor 王诗斌
Owner 安徽鹏远金属制品股份有限公司
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