Metal pipe and corrosion protection method thereof

A technology for metal pipes and outer pipes, applied in anti-corrosion coatings, alkali metal silicate coatings, pipes, etc., can solve the problems of needing improvement, inseparability, high cost, etc., to improve cathodic protection efficiency, facilitate spraying construction, and prevent corrosion The effect of performance improvement

Active Publication Date: 2018-12-25
浙江万华不锈钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned metal pipes have the following technical defects: the inner pipe and the outer pipe are connected by adhesives and spot welding, and cannot be separated from each other after the manufacture is completed, and the corrosion-resistant metal is not absolutely corrosion-free, and will still corrode after a long period of use , so the entire metal tube needs to be replaced, which is costly and needs to be improved

Method used

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  • Metal pipe and corrosion protection method thereof
  • Metal pipe and corrosion protection method thereof
  • Metal pipe and corrosion protection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] a metal tube such as figure 1 As shown, it includes the outer pipe 1 and the inner pipe 2. The inner pipe 2 is close to the inner wall of the outer pipe 1 and has the same length. Therefore, when the metal pipe is used to transport corrosive media such as brine and sulfuric acid, the inner wall of the inner pipe 2 contacts with it to resist corrosion. And the outer tube 1 is not prone to corrosion. The outer tube 1 can be made of high-strength metal material or alloy to provide high compressive strength, such as: iron, steel, etc.; the inner tube 2 can be made of corrosion-resistant metal material or alloy to provide corrosion resistance, such as: copper, stainless steel, Nickel-based alloys, etc. Since corrosion-resistant metals are generally more expensive than high-strength metals, unless they are used in some environments that require extremely high strength, the thickness ratio of the outer tube 1 and the inner tube 2 can be controlled at (2-3):1 to ensure a lower...

Embodiment 2

[0057] The anticorrosion method of metal pipe in embodiment one, comprises the steps:

[0058] Step A: First polish the surface of the inner and outer tubes, then immerse in a medium-alkaline degreaser for 25 minutes, take it out, rinse it with clean water, and dry it. The degreaser includes 14 parts of sodium hydroxide, 7 parts of sodium phosphate, 7 parts of sodium carbonate, 2 parts of sodium silicate, 100 parts of water;

[0059] Step B: Shot blasting the inner and outer pipes to Sa2.5 level, and the surface roughness is controlled at 50 μm;

[0060] Step C: Use a spraying machine to spray water-based zinc-rich paint on the surface of the inner tube and the outer tube, the compression ratio is 65:1, the intake pressure is 0.3MPa, the ambient temperature is ≥10°C, and the relative air humidity is ≤85%;

[0061] Step D: Spray a sealer paint, dry for 3 hours, and the dry film thickness is 20 μm, so that it can completely penetrate into the primer;

[0062] Step E: Spray two...

Embodiment 3

[0085] The anticorrosion method of metal pipe in embodiment one, comprises the steps:

[0086] Step A: First polish the surface of the inner and outer tubes, then immerse in a medium-alkaline degreaser for 20 minutes, take it out, rinse it with clean water, and dry it. The degreaser includes 14 parts of sodium hydroxide, 7 parts of sodium phosphate, 7 parts of sodium carbonate, 2 parts of sodium silicate, 100 parts of water;

[0087] Step B: Shot blasting the inner and outer pipes to Sa2.5 level, and the surface roughness is controlled at 40 μm;

[0088] Step C: Use a spraying machine to spray water-based zinc-rich paint on the surface of the inner tube and the outer tube, the compression ratio is 65:1, the intake pressure is 0.28MPa, the ambient temperature is ≥10°C, and the relative air humidity is ≤85%;

[0089] Step D: Spray a sealer paint, dry for 2 hours, and the dry film thickness is 15 μm, so that it can completely penetrate into the primer;

[0090] Step E: Spray tw...

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Abstract

The invention discloses a metal pipe and a corrosion protection method of the metal pipe and relates to the field of metal corrosion protection. The metal pipe comprises an outer pipe and an inner pipe, wherein the inner pipe is clung to an inner wall of the outer pipe; the inner pipe and the outer pipe are equal in length; fixing rings are in threaded connection with the outer sides of the two ends of the inner pipe; and fixing grooves where the fixing rings are clamped are formed on the two end faces of the outer pipe. After the inner pipe is corroded, the two fixing rings are removed; the inner pipe can be taken out of the outer pipe, so that the inner pipe is convenient to replace; and the cost is greatly lowered compared with the situation that the entire metal pipe is replaced. Flange plates are required to be welded on outer walls at the two ends of the outer pipe during metal pipe mounting, so that the metal pipe is in flanged connection with other pipelines; and the metal pipecan be dismounted. The metal pipe is applicable to transportation of corrosive media such as saline water and sulfuric acid.

Description

technical field [0001] The invention relates to the field of metal anticorrosion, in particular to a metal pipe and an anticorrosion method thereof. Background technique [0002] Pipe fittings are a general term for components that play the roles of connection, control, direction change, flow diversion, sealing and support in the pipeline system, and their materials can be plastic, metal, etc. Metal pipe fittings have the advantage of high strength, but the disadvantage is that they have poor corrosion resistance and need anti-corrosion treatment. Especially for pipe fittings used to transport corrosive media or pipe fittings that need to be immersed in corrosive environments such as seawater, the anti-corrosion effect is particularly important, which determines the service life of the pipe fittings. Common anti-corrosion methods include coating protection, electrical protection, passivation treatment, etc. [0003] The Chinese patent with the notification number CN1018763...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/02F16L58/10C09D1/04C09D5/10C09D7/62
CPCC09D1/04C09D5/106C09D7/62F16L9/006F16L9/02F16L58/1027F16L58/1072
Inventor 朱良才
Owner 浙江万华不锈钢有限公司
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