Weld surface protection method for aluminum alloy storage tank storing N2O4 for a long time

A welding seam surface, long-term storage technology, applied in the field of surface oxide cleaning, base material surface roughening treatment and coating deposition, can solve the secondary thermal degradation of base material and weld performance, thin-wall storage tank deformation, Welded joint failure and other problems, to achieve excellent resistance to N2O4 and salt spray corrosion, improve bonding strength, accurate and controllable thickness

Inactive Publication Date: 2016-03-23
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, anodizing treatment is sensitive to the shape of the base material, and it is prone to discontinuous coverage at the joint between the weld and the base metal and in the pores, and is limited by the size and shape of the tank, so its application in full-size tanks is restricted; Coating protection materials are difficult to withstand the long-term chemical corrosion of fuel and strong corrosive agents in the storage tank, and

Method used

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  • Weld surface protection method for aluminum alloy storage tank storing N2O4 for a long time
  • Weld surface protection method for aluminum alloy storage tank storing N2O4 for a long time
  • Weld surface protection method for aluminum alloy storage tank storing N2O4 for a long time

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0053] A long-term storage N 2 o 4 The method for protecting the weld seam surface of an aluminum alloy tank, the steps of the method are as follows:

[0054] (1) Weld shape processing

[0055] The surface of the weld seam on the inner wall of the aluminum alloy storage tank is mechanically ground and trimmed to remove the tumor on the surface of the weld seam, so that the average height difference between the weld seam and the fusion line of the base material is less than 0.5mm.

[0056] (2) Weld surface pretreatment

[0057] When the surface of the weld seam has a bright metallic color after mechanical grinding, the surface of the weld seam is not sandblasted.

[0058] (3) Preparation of aluminum alloy composite coating

[0059] Aluminum powder and smelted and crushed polygonal Al with a particle size of 10 μm to 75 μm 2 o 3 The powders are mechanically mixed to obtain the mixed powder, based on the total mass of the mixed powder as 100%, in which Al 2 o 3 Powder mas...

Embodiment 3

[0067] A long-term storage N 2 o 4 The method for protecting the weld seam surface of an aluminum alloy tank, the steps of the method are as follows:

[0068] (1) Weld shape processing

[0069] With embodiment 2 step (1).

[0070] (2) Weld surface pretreatment

[0071] With embodiment 2 step (2).

[0072] (3) Preparation of aluminum alloy composite coating

[0073] The 2024 aluminum alloy powder and the smelted and crushed polygonal Al with a particle size of 10 μm to 75 μm 2 o 3 Powder mixed to obtain mixed powder, based on the total mass of mixed powder as 100%, in which Al 2 o 3 The mass percentage of powder is 40%.

[0074] The rest is the same as step (3) of Example 2, and the thickness of the aluminum alloy composite coating obtained after spraying once is 600 μm.

[0075] The aluminum alloy tank weld sample with aluminum alloy composite coating protection prepared in this embodiment is subjected to the following tests:

[0076] (1) Tested according to the tes...

Embodiment 4

[0081] A long-term storage N 2 o 4 The method for protecting the weld seam surface of an aluminum alloy tank, the steps of the method are as follows:

[0082] (1) Weld shape processing

[0083] With embodiment 2 step (1).

[0084] (2) Weld surface pretreatment

[0085] With embodiment 2 step (2).

[0086] (3) Preparation of aluminum alloy composite coating

[0087] The 2219 aluminum alloy powder and the smelted and crushed polygonal Al with a particle size of 10 μm to 75 μm 2 o 3 Powder mixed to obtain mixed powder, based on the total mass of mixed powder as 100%, in which Al 2 o 3 Powder mass percentage content is 40%;

[0088] The rest is the same as step (3) of Example 2, and the thickness of the aluminum alloy composite coating obtained after spraying once is 580 μm.

[0089] The aluminum alloy tank weld sample with aluminum alloy composite coating protection prepared in this embodiment is subjected to the following tests:

[0090] (1) According to the test meth...

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Abstract

The invention relates to a weld surface protection method for an aluminum alloy storage tank storing N2O4 for a long time, and belongs to the technical field of aluminum alloy weld corrosion protection. According to the method, weld surface accumulated tumors are removed through mechanical grinding; the diameters of holes with the diameters being smaller than 0.5 mm are expanded by 2-5 times; the height difference between a weld and a base body material fusion line is smaller than 0.8 mm; aluminum powder and 2024 aluminum alloy powder or 2219 aluminum alloy powder are mixed with Al2O3 powder respectively, then the powder is sent into a cold spray gun to prepare an aluminum alloy composite coating, and weld surface coarsening and oxide removal are achieved synchronously; and when welding slag and/or black gray oxidized layers exist on the weld surface, before the aluminum alloy composite coating is deposited through cold spraying, the Al2O3 powder or SiC powder is sent into the cold spray gun so as to carry out sand blasting on the weld surface, and after treatment, residual welding slag and residual black gray oxidized layers do not exist through visual inspection. By means of the method, corrosion protection on the weld of the inner wall of the aluminum alloy storage tank storing N2O4 for a long time can be achieved, and deformation of a large-size thin-wall tank body is controlled.

Description

technical field [0001] The present invention relates to a long-term storage N 2 o 4 The surface protection method of aluminum alloy storage tank welds, specifically, involves a long-term storage of strong oxidants N 2 o 4 The corrosion protection method of the inner surface weld seam of an aluminum alloy storage tank, the method is by depositing a composite coating containing aluminum alloy on the surface of the weld seam, adjusting the spray powder material, size and proportion, so as to realize the welding seam in strong oxidant N 2 o 4 long-term corrosion protection; the method can simplify the preparation steps, realize the oxide cleaning of the weld surface, the roughening treatment of the base material surface and the deposition of the coating in one step, and effectively solve the problem of long-term storage of strong oxidant N in the storage tank. 2 o 4 The problem of intergranular corrosion and pitting corrosion; belongs to the technical field of corrosion prote...

Claims

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Application Information

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IPC IPC(8): C23C24/02
CPCC23C24/02
Inventor 宁先进佟玮王全胜余剑曹歆昕柳彦博
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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