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Heating furnace radiation area collecting pipe surface high temperature corrosion resistant coating and preparation method thereof

A technology for corroding coatings and radiation areas, applied in coatings, metal material coating processes, fusion spraying, etc., can solve the problems of staying in the laboratory, single type of coating, limited protective effect, etc., and achieve equipment and process Simplicity, improved bonding strength, and high production efficiency

Inactive Publication Date: 2020-04-07
江阴市东泰管件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, TAFA Company of the United States has developed the 45CT coating by arc spraying. Its composition is 55wt% Ni, 43wt% Cr and 2wt% Ti. During the high temperature oxidation process, a dense oxide film is formed, which limits the penetration of corrosive media. Therefore, this coating is used The service life of the pipes in the radiation zone of the heating furnace protected by the coating can reach more than 10 years, but the cost per square meter is as high as 6,000 yuan, which is very high
Domestically, high-temperature corrosion-resistant coatings for the surface of the manifold in the radiant zone of the heating furnace are also produced, but the types of coatings are single and the protective effect is limited.
The highest heat-resistant temperature of the existing coating systems on the market is about 400-600°C, and the coatings that can be used at higher temperatures (1000°C) are still only in the laboratory stage, basically relying on imports
And because the high-temperature coating protection technology involves nuclear power plant equipment, aerospace equipment, etc., foreign countries generally adopt technical blockade

Method used

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  • Heating furnace radiation area collecting pipe surface high temperature corrosion resistant coating and preparation method thereof
  • Heating furnace radiation area collecting pipe surface high temperature corrosion resistant coating and preparation method thereof
  • Heating furnace radiation area collecting pipe surface high temperature corrosion resistant coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A heat-resistant steel sheet with a thickness of 3 mm is selected as the base material. The thickness of the NiCrAlY alloy transition layer on the base is 30 μm, and the thickness of the YSZ ceramic coating is 80 μm. The specific preparation method is as follows:

[0032] 1. Clean the substrate, and use 60-mesh brown corundum sand for surface blasting pretreatment to make the roughness meet the spraying requirements and improve the bonding strength between the coating and the substrate.

[0033]2. Supersonic flame spraying is used to prepare the alloy coating on the surface of the substrate. The parameters used are: the pressures of oxygen, propane gas and compressed air are 1.8MPa, 0.4MPa and 0.6MPa respectively, and the flow rates are 550slpm, 60slpm and 400slpm respectively. The powder feeding gas pressure is 0.6MPa, the flow rate is 10-20slpm, the powder feeding rate is 60g / min, and the spraying distance is 200mm.

[0034] 3. Prepare a ceramic coating on the surface...

Embodiment 2

[0038] In this example, the amount of Al added in the sealing agent was changed to 0.3 wt%, and other preparation conditions were exactly the same as those in Example 1. Using a muffle furnace to test the static oxidation performance of the coating at high temperature, when the temperature is 1000 ° C, the coating sample has no obvious peeling off, cracking, perforation and other phenomena within 50 hours, indicating that the coating has good high temperature oxidation resistance .

Embodiment 3

[0040] In this example, the Al in the sealing agent is changed to a mixture of Al and Ni, the mixing ratio is Al:Ni=3:2, and other preparation conditions are exactly the same as in Example 1. Using a muffle furnace to test the static oxidation performance of the coating at high temperature, when the temperature is 1000 ° C, the coating sample has no obvious peeling off, cracking, perforation and other phenomena within 50 hours, indicating that the coating has good high temperature oxidation resistance .

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Abstract

The invention discloses a heating furnace radiation area collecting pipe surface high temperature corrosion resistant coating and a preparation method thereof. The method is characterized in that heatresistant steel is taken as a base material, and cleaning, oil removing, rust removing and surface roughening are carried out on the heat resistant steel, firstly, an alloy transition layer and a ceramic coating are prepared on a surface of a base body through thermal spraying, and then hole sealing treatment is conducted through an inorganic hole sealing agent containing trace metal elements (Al, Ni, Ti, Mg and the like); in the high-temperature oxidation process, metal elements in the hole sealing agent are diffused to the position near an interface of microcracks and pores of the ceramic coating firstly, moreover, most of metal is subjected to an oxidation reaction to generate a metal oxide film, the microcracks and the pores in the ceramic coating can be filled up, and the coating isprevented from being further oxidized. The method is advantaged in that a heat-resistant steel base body is protected against high-temperature oxidation and corrosion through the ceramic coating, stress concentration in the coating is relieved through the alloy transition layer, the bonding strength of the heat-resistant steel base body and the ceramic coating is improved, and the service life ofthe heating furnace radiation area collecting pipe can be remarkably prolonged; and the required equipment and process are relatively simple, operation is easy, production efficiency is higher, cost is lower, the production process is pollution-free, and the industrialization prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of material surface protection, and in particular relates to the surface protection technology of a collection pipe in a heating furnace radiation area, in particular to a high-temperature corrosion-resistant coating on the surface of a collection pipe in a heating furnace radiation area and a preparation method thereof. Background technique [0002] In enterprises such as petroleum, chemical industry and electric power, heating furnace is an important heating equipment. The collecting tube in the radiation area of ​​the heating furnace will be oxidized and corroded at high temperature during use, which will seriously reduce the thickness of the tube wall or even perforate it. This is the main reason for the failure of the collecting tube in the radiation area. The problem of high temperature corrosion is imminent. [0003] During the operation of the heating furnace, the temperature of the outer wall of th...

Claims

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Application Information

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IPC IPC(8): C23C4/129C23C4/134C23C4/073C23C4/11C23C4/18C23C4/10C23C4/08
CPCC23C4/08C23C4/18C23C4/11C23C4/129C23C4/134
Inventor 孟扣生
Owner 江阴市东泰管件有限公司
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