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Preparation technology for steel-surface in-situ ceramic layer used in low-temperature aluminizing petroleum pipeline

A technology for pipeline steel and preparation process, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problem of preparing anti-corrosion ceramic layer, etc. High bonding strength

Inactive Publication Date: 2014-08-13
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a preparation process of an in-situ ceramic layer on the surface of steel for low-temperature aluminized oil pipelines, aiming at the fact that other coating methods cannot be prepared on the surface of steel for oil pipelines under low temperature conditions. The anti-corrosion ceramic layer with high bonding strength has the characteristics of simple operation, compact structure, uniform and continuous structure thickness, and improved corrosion protection effect.

Method used

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  • Preparation technology for steel-surface in-situ ceramic layer used in low-temperature aluminizing petroleum pipeline
  • Preparation technology for steel-surface in-situ ceramic layer used in low-temperature aluminizing petroleum pipeline
  • Preparation technology for steel-surface in-situ ceramic layer used in low-temperature aluminizing petroleum pipeline

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Experimental program
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Effect test

Embodiment 1

[0027] A process for preparing an in-situ ceramic layer on the surface of steel for low-temperature aluminized oil pipelines, comprising the following steps:

[0028] (1) Low temperature aluminizing

[0029] Mix 300-mesh aluminum powder, 300-mesh zinc powder, and ammonium chloride powder evenly according to the following mass ratio to make 100 g of embedding agent:

[0030] Aluminum powder 60%

[0031] Zinc powder 38.5%

[0032] Ammonium Chloride Powder 1.5%.

[0033] The petroleum pipeline steel after the surface mechanical grinding treatment was embedded in the above embedding infiltration agent, and the embedding aluminizing treatment was carried out. The embedding aluminizing temperature was 470° C., and the embedding treatment was performed for 2 hours.

[0034] (2) Thermal oxidation treatment

[0035] Put the oil pipeline steel after step 1 low-temperature aluminized into a tubular atmosphere resistance furnace heated to a certain temperature, feed oxygen and keep wa...

Embodiment 2

[0039] A process for preparing an in-situ ceramic layer on the surface of steel for low-temperature aluminized oil pipelines, comprising the following steps:

[0040] (1) Low temperature aluminizing

[0041] Mix 300-mesh aluminum powder, 300-mesh zinc powder, and ammonium chloride powder evenly according to the following mass ratio to make 100 g of embedding agent:

[0042] Aluminum powder 80%

[0043] Zinc powder 18.5%

[0044] Ammonium Chloride Powder 1.5%.

[0045] The oil pipeline steel after the surface mechanical grinding treatment was embedded in the above embedding infiltration agent, and the embedding aluminizing treatment was carried out. The embedding aluminizing temperature was 530° C., and the embedding treatment was performed for 1 hour.

[0046] (2) Thermal oxidation treatment

[0047] Put the oil pipeline steel after step 1 low-temperature aluminized into a tubular atmosphere resistance furnace heated to a certain temperature, feed oxygen and keep warm to f...

Embodiment 3

[0051] A process for preparing an in-situ ceramic layer on the surface of steel for low-temperature aluminized oil pipelines, comprising the following steps:

[0052] (1) Low temperature aluminizing

[0053] Mix 300-mesh aluminum powder, 300-mesh zinc powder, and ammonium chloride powder evenly according to the following mass ratio to make 100 g of embedding agent:

[0054] Aluminum powder 70%

[0055] Zinc powder 28.5%

[0056] Ammonium Chloride Powder 1.5%.

[0057] Embed the oil pipeline steel after the surface mechanical grinding treatment in the above-mentioned embedding infiltration agent, and perform embedding aluminizing treatment. The embedding aluminizing temperature is 500 ° C, and the embedding treatment is performed for 3 hours;

[0058] (2) Thermal oxidation treatment

[0059] Put the oil pipeline steel after step 1 low-temperature aluminizing into a tubular atmosphere resistance furnace heated to a certain temperature, feed oxygen and keep warm to form a cer...

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Abstract

A process for preparing an in-situ ceramic layer on the surface of a low-temperature aluminized oil pipeline steel, characterized in that it includes the following steps: 1. Low-temperature aluminized, embedding the oil pipeline steel after surface mechanical grinding in an embedding infiltration agent , the embedding aluminizing temperature is 470-530°C, and the embedding treatment is 1-3 hours; 2. Thermal oxidation treatment, the oil pipeline steel after step 1 low-temperature aluminizing is put into a tubular atmosphere resistance furnace heated to a certain temperature In the process, the ceramic layer is formed in situ by introducing oxygen and keeping warm. The partial pressure of oxygen is 20-30Pa, the thermal oxidation temperature is 400-650°C, and the holding time is 6-10 hours. It has the advantages of simple operation, compact structure, uniform and continuous structure thickness, Features that improve the corrosion protection effect.

Description

technical field [0001] The invention relates to a preparation process of a ceramic layer on a metal surface, in particular to a preparation process of an in-situ ceramic layer on a steel surface for low-temperature aluminized oil pipelines. Background technique [0002] Ceramic materials have good high-temperature stability and good corrosion resistance to acids, alkalis, and salts, and are expected to provide excellent anti-corrosion and anti-oxidation properties for steel matrix materials for oil pipes. However, the physical properties of ceramic materials and metal materials are quite different, including thermal expansion coefficient, thermal conductivity, etc., and ceramic coatings are directly prepared on the surface of oil pipe steel by coating preparation methods including thermal spraying, embedding, and deposition. It is easy to cause stress concentration, resulting in low bonding strength between the coating and the substrate, especially the coating preparation pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/50C23C10/60
Inventor 黄敏王宇
Owner XI'AN PETROLEUM UNIVERSITY
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