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Chemical removing technology for composite coating of aircraft engine steel blade before low temperature aluminizing

An aero-engine and chemical removal technology is applied in the field of chemical removal of low-temperature aluminized composite coatings for aero-engine steel blades, which can solve the problems of high labor intensity, low efficiency, and difficult control of the size of the substrate, and achieve the effect of ensuring reliability.

Inactive Publication Date: 2004-01-28
中国人民解放军第5719工厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the disadvantages of high labor intensity, low efficiency, and difficult control of the size of the substrate, and is extremely unsuitable for mass production, especially for mass production of coated parts for repair.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032] Add 500kg of tap water to a stainless steel container, then add 5kg of sodium oxalate, 40kg of sodium hydroxide, stir and dissolve, add 20kg of sodium nitrate while it is hot and wait for the solution to cool to room temperature, add 20kg of potassium permanganate and stir evenly, add water to the total weight 1000kg, after mixing uniformly, the required 1000kg alkaline solution is obtained.

[0033] Pour the solution into the A3 steel tank, heat it to 80℃, put the refurbished blades in a stainless steel basket, immerse it in the heated solution for 6 minutes, hang it out, immerse it in tap water to rinse, and then use the temperature not lower than 60℃ Rinse with hot water and blow dry with compressed air.

example 2

[0035] 1. Prepare alkaline cleaning solution in A3 steel tank with electric heating tube and exhaust system. Pour 500kg tap water into the channel steel, then add 20kg sodium citrate, add 180kg potassium hydroxide after it is dissolved, stir and dissolve, add 100kg potassium nitrate while it is hot, stir evenly, add 40kg potassium permanganate after cooling to room temperature , Add 160kg of water and dissolve it evenly, and then prepare 1000kg of alkaline cleaning solution. spare.

[0036] 2. Prepare the anode film removal solution in a heatable stainless steel tank. Inject 500kg of tap water first, add 20kg of sodium tripolyphosphate, add 50kg of potassium hydroxide and 20kg of sodium nitrate after dissolution, add 410kg of water and stir well, and after dissolving, 1000kg of anode membrane removal solution is prepared.

[0037] 3. The operation of removing the composite coating. Put the blades in a stainless steel basket, hung into the hot alkaline cleaning solution heated to 1...

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Abstract

The removing scheme uses removing solution comprising potassium (sodium) hydroxide, sodium (potassium) nitrate, potassium permanganate and salt of organic acid. The solution can eliminate aluminum layer fast to passivate the interface between the permeated layer and the substrate, and break the -Si-O-Si-bond in the inorganic silicate polymer film or dissolve the film through the action of oxidant. The technological process features that the blade is needed only to be soaked in the solution for several min. before water washing and drying. It is saving in time and labor, and has no harmful effect on base material.

Description

Technical field: [0001] The invention relates to a production method for chemically removing low-temperature aluminizing composite coatings on steel blades of aeroengines. Background technique: [0002] The composite coating of engine steel blades is composed of a low-temperature aluminizing layer and a modified silicate ceramic surface layer. The chemical composition of the low-temperature aluminized layer is mainly Fe 2 Al 5 And FeAl 3 . The test shows that the thickness of the aluminized layer is about 12 μm. Under normal circumstances, the Al concentration reaches 6% in the 11μm depth of the substrate. The closer to the surface, the higher the Al concentration, and the surface layer is as high as 68%. However, the 16-20μm depth below the substrate is the component of the substrate itself. Therefore, the entire aluminizing From the chemical composition point of view, the Fe base is rich in Al and Cr. [0003] The modified silicate ceramic surface layer is uniformly coated or s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/32
Inventor 幸泽宽向巧陶洪兵
Owner 中国人民解放军第5719工厂
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