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Production method for anticorrosive nodular cast iron pipe

A ductile iron pipe and a production method technology, applied in the direction of pipes, rigid pipes, pipes/pipe joints/fittings, etc., can solve the problems of low corrosion resistance of ductile iron pipes, the surface is easily corroded and rusted, etc., and achieves high anti-corrosion performance. , strong adhesion, not easy to fall off

Inactive Publication Date: 2015-10-14
LIUZHOU BAITIAN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a production method of corrosion-resistant ductile iron pipes to solve the problem that the ductile iron pipes produced by the existing methods have low corrosion resistance and the surface is easily corroded and rusted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A kind of production method of corrosion-resistant ductile iron pipe, concrete steps are as follows:

[0015] a. The surface of the ductile iron pipe substrate is sandblasted, the rust removal level reaches Sa2.5, and the surface anchor pattern depth is 40 μm;

[0016] b. Blow the surface of the ductile iron pipe substrate with compressed air,

[0017] c. Heat the base of the ductile iron pipe to 50°C;

[0018] d. Mix the A and B components of the polyurethane anti-corrosion coating uniformly at a ratio of 1:1, use an airless sprayer to evenly coat the coating on the surface of the ductile iron pipe substrate, and carry out the construction according to the multi-layer spraying method. The thickness of each coating is 60μm, spray one coat at intervals of 3 minutes, and spray 6 coats;

[0019] e. After the coating on the surface of the ductile iron pipe substrate is completely dry, the corrosion-resistant ductile iron pipe is obtained.

Embodiment 2

[0021] A kind of production method of corrosion-resistant ductile iron pipe, concrete steps are as follows:

[0022] a. The surface of the ductile iron pipe substrate is sandblasted, the rust removal level reaches Sa2.5, and the surface anchor pattern depth is 70 μm;

[0023] b. Blow the surface of the ductile iron pipe substrate with compressed air,

[0024] c. Heat the base of the ductile iron pipe to 55°C;

[0025] d. Mix the A and B components of the polyurethane anti-corrosion coating uniformly at a ratio of 1:1, use an airless sprayer to evenly coat the coating on the surface of the ductile iron pipe substrate, and carry out the construction according to the multi-layer spraying method. The thickness of each coating is 80 μm, spray one coat at intervals of 4 minutes, and spray 8 coats;

[0026] e. After the coating on the surface of the ductile iron pipe substrate is completely dry, the corrosion-resistant ductile iron pipe is obtained.

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Abstract

The invention discloses a production method for an anticorrosive nodular cast iron pipe and relates to the technical field of metal corrosion resistance. The production method comprises the steps that firstly, the surface of a nodular cast iron pipe base body is subjected to sand blasting treatment; secondly, the surface of the nodular cast iron pipe base body is blown clean through compressed air; and thirdly, the nodular cast iron pipe base body is heated to 50-55 DEG C; a component A and a component B of a polyurethane anticorrosive coating are mixed evenly according to the proportion of one to one, an airless sprayer is used for evenly spraying the coating onto the surface of the nodular cast iron pipe base body, and construction is carried out in a one-layer multipass spraying mode. Compared with the prior art, the coating is sprayed onto the nodular cast iron pipe base body uniformly and is high in adhesive force; the nodular cast iron pipe produced through the method is high in corrosion resistance; a corrosion resistant coating layer of the nodular cast iron pipe is not prone to stripping, and operation is easy and convenient.

Description

technical field [0001] The invention relates to the technical field of metal anticorrosion, in particular to a production method of a corrosion-resistant ductile iron pipe. Background technique [0002] Ductile iron pipe has the essence of iron and the performance of steel. After annealing, the metallographic structure of ductile iron pipe is ferrite plus a small amount of pearlite. It has good mechanical properties, good ductility, good sealing effect, and easy installation. It is mainly used for Municipal, industrial and mining enterprises water supply, gas transmission, oil transportation, etc. Due to the low corrosion resistance of the currently produced ductile iron pipes, the surface is easily corroded and rusted. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a production method of corrosion-resistant ductile iron pipes to solve the problems that the ductile iron pipes produced by the existing methods ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/02F16L58/10B05D5/00
CPCF16L9/02B05D5/00F16L58/10
Inventor 谭科文李丽萍
Owner LIUZHOU BAITIAN MACHINERY
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