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Solution for removing containmanted titanium alloy layers

A technology of titanium alloy and solution, which is applied in the field of chemical corrosion, can solve the problems that the titanium alloy pollution layer cannot be removed, and achieve the effect of improving efficiency and increasing service life

Inactive Publication Date: 2004-07-21
沈阳黎明航空发动机集团公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the existing corrosion solution cannot remove the titanium alloy contamination layer, the present invention provides a method that can corrode the titanium alloy surface contamination layer without affecting the dimensional tolerance of the parts, and the surface of the parts will not produce intergranular corrosion, which is harmful to the surface of the parts. It has a leveling effect and can improve the surface finish of parts, a solution for removing titanium alloy contamination layer

Method used

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Embodiment Construction

[0017] Corrosion solution: uniformly mixed according to the following formula.

[0018] Hydrofluoric acid HF (42%) 70ml / L

[0019] Nitric acid HNO 3 (65-68%) 150ml / L

[0020] Additive No. 1 H 3 PO 4 (85%) 100ml / L

[0021] No. 2 Additive Carbonamide Derivative 25g / L

[0022] The balance is water

[0023] Sample preparation

[0024] Will B T 3-1 The bar is heated to 870°C and kept for 1 hour: cooled to 650°C with the furnace, held for 2 hours and air-cooled, and processed into a disc with a diameter of 65mm.

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Abstract

A solution for removing contaminated layer of titanium alloy is compounded with HF and HNO3 as main components and the use level of 42% concentration HF is 5-15 vol% and that of 65-68 % concentration HNO3 is 10-30 vol%. The No.1 solution contains also 85% concentration H2PO4 8-20 vol% with the rest of water and the No.2 solution contains also carbonyl amine derivative 15-40 g / l with the rest of water. The solution of the present invention can eliminate contaminated layer of titanium alloy completely, and this can raise the broaching and milling efficiency and increase the service life of broach obviously.

Description

technical field [0001] The invention belongs to the technical field of chemical corrosion. Background technique [0002] Chemical milling is also called chemical etching or form etching. It is a chemical processing method that puts the metal in a strong acid or strong alkali solution to uniformly corrode a part of the surface of the part at a certain corrosion rate through a chemical reaction to obtain the required shape and size. [0003] The development of the modern aviation industry requires the design and manufacture of integral reinforcement components with precise tolerances, variable cross-section or curved surface parts according to aerodynamics and stress distribution requirements, and the increasing use of special metal materials with high strength, light specific gravity, and good physical and mechanical properties. Such as titanium alloys, these all bring great difficulties to ordinary cutting methods. [0004] For example, during the normal pressure heat trea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/26
Inventor 张叶盛王学连韩立夫
Owner 沈阳黎明航空发动机集团公司