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Chemical polishing liquid and polishing method for laser additive manufacturing of special-shaped titanium alloy

A technology of chemical polishing and laser material addition, which is applied in the field of surface treatment and metal treatment, can solve the problems of obvious corrosion of titanium alloy substrate, over-corrosion of titanium alloy workpiece surface, and difficult control of reaction rate, etc. Stable properties and the effect of improving the overall gloss

Active Publication Date: 2020-03-24
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the strong acidity of hydrofluoric acid, hydrochloric acid, and perchloric acid, the solution reaction is very violent during the polishing process, and the corrosion effect on the titanium alloy substrate is obvious, and the reaction rate is not easy to control, which often leads to over-corrosion or polishing lines on the surface of titanium alloy workpieces , the surface is easy to absorb hydrogen and other adverse results

Method used

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  • Chemical polishing liquid and polishing method for laser additive manufacturing of special-shaped titanium alloy
  • Chemical polishing liquid and polishing method for laser additive manufacturing of special-shaped titanium alloy
  • Chemical polishing liquid and polishing method for laser additive manufacturing of special-shaped titanium alloy

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Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 is 80mm in length, and the laser additive manufacturing titanium alloy tubular workpiece ( figure 1 (a) Strip) was polished.

[0033] (1) Pretreatment: put the titanium alloy workpiece into an acetone solution for ultrasonic cleaning and degreasing, and then wash and dry it with deionized water.

[0034] (2) configure chemical polishing liquid: according to the polishing liquid provided by the invention, under preferred conditions, 160ml ammonium bifluoride (16%), 360ml hydrogen peroxide (30%), 60ml hexamethylenetetramine (16%), 360ml of nitric acid (65%-80%), 30ml of additives and 5g of magnetic additives were mixed in proportion, and magnetically stirred at room temperature (20°C) to prepare 1L of polishing solution. 290g of sodium hydroxide, 240g of sodium nitrate, 18g of thiourea, 9.5g of sodium silicate and 1.5g of sodium lauryl sulfate were mixed in proportion and magnetically stirred to prepare a 1L pass solution.

[0035] (3) Chemical polishing: F...

Embodiment 2

[0038] Embodiment 2 The length is 60m, the outer diameter is 5mm, and the laser additive manufacturing titanium alloy curved thin tubular workpiece ( figure 1 (b) S shape) is polished.

[0039] (1) Pretreatment: put the titanium alloy workpiece into an acetone solution for ultrasonic cleaning and degreasing, and then wash and dry it with deionized water.

[0040] (2) configure chemical polishing liquid: according to the polishing liquid provided by the invention, under preferred conditions, 165ml ammonium bifluoride (16%), 365ml hydrogen peroxide (30%), 65ml hexamethylenetetramine (16%), 360-370ml of nitric acid (65%-80%), 32ml of additives and 7.5g of magnetic additive materials are mixed in proportion, and magnetically stirred at room temperature to prepare 1L of polishing liquid. 300g of sodium hydroxide, 250g of sodium nitrate, 20g of thiourea, 10g of sodium silicate and 1.7g of sodium lauryl sulfate were mixed in proportion and magnetically stirred to prepare a 1L pass sol...

Embodiment 3

[0044] Embodiment 3 is 90mm to total length, and the laser additive manufacturing titanium alloy tubular workpiece ( figure 1 (c) V shape) is polished.

[0045] (1) Pretreatment: put the titanium alloy workpiece into an acetone solution for ultrasonic cleaning and degreasing, and then wash and dry it with deionized water.

[0046] (2) configure chemical polishing liquid: according to the polishing liquid provided by the invention, under preferred conditions, 170ml ammonium bifluoride (16%), 370ml hydrogen peroxide (30%), 70ml hexamethylenetetramine (16%), 370ml of nitric acid (65%-80%), 35ml of additives and 10g of magnetic additive materials were mixed in proportion, and magnetically stirred at room temperature to prepare 1L of polishing liquid. 310g of sodium hydroxide, 260g of sodium nitrate, 22g of thiourea, 10.5g of sodium silicate and 1.8g of sodium lauryl sulfate were mixed in proportion, and magnetically stirred to prepare a 1L pass solution.

[0047] (3) Chemical po...

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Abstract

The invention provides a chemical polishing liquid and a polishing method for laser additive manufacturing of special-shaped titanium alloys, and belongs to the technical field of metal surface treatment. The chemical polishing liquid is mainly composed of two solution systems: polishing liquid and polishing liquid. The polishing liquid is mixed with ammonium bifluoride, hydrogen peroxide, hexamethylenetetramine, nitric acid, additives and magnetic additive materials; the polishing liquid is composed of hydrogen A mixture of sodium oxide, sodium nitrate, thiourea, sodium silicate and sodium lauryl sulfate. The chemical polishing method includes pretreatment, electrolyte preparation, two-stage chemical polishing, and post-processing. The chemical polishing fluid of the present invention not only removes the floating powder remaining on the surface of titanium alloy manufactured by laser additive manufacturing during the polishing process by adding magnetic abrasives, but also can effectively suppress the chemical reaction speed and prevent excessive corrosion or excessive weight loss of the sample. Using this polishing fluid for polishing will not produce lines on the titanium alloy surface, which can effectively reduce the surface roughness of the titanium alloy, improve the gloss, and obtain a high-quality surface.

Description

technical field [0001] The invention belongs to the technical field of surface treatment in the field of metal treatment, and in particular relates to a chemical polishing liquid and a polishing method for laser additive manufacturing of special-shaped titanium alloy workpieces which are difficult to perform surface treatment through mechanical polishing. Background technique [0002] Laser additive manufacturing is already widely used to create complex components that are difficult to manufacture by traditional methods or other high-cost metals. Due to its light weight, high strength, good toughness, corrosion resistance, and high heat resistance, titanium alloys have gained more and more widespread use in the fields of aerospace, navigation, petrochemicals, human implants, biomedical engineering, and metallurgy. application has become a research hotspot in recent years. However, in these fields, the requirements for the surface quality of titanium alloy parts are also inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/26B22F3/24
CPCB22F3/24B22F2003/247C23F1/26
Inventor 李建中张翼飞车双行
Owner NORTHEASTERN UNIV LIAONING